Holley carb high idle in park. I wouldn't say a lot, but more than I like.
Holley carb high idle in park This is a vacuum secondary 4150 style carburetor If the carb does not drip from booster during any of the above scenario, then you your IDLE air bleeds/passage may be blocked, allowing a siphon affect to happen with a very low negative pressure. 5 inches of vacuum. May 18, 2021 · The carb has a manual choke and I hardly use it, but yes it happens when engine is cold and warmed up. then you can adjust down the curb idle at the carb. Is the carb set with the idle slot showing . Note that locked out race engines idle high toand has the cylinder Sep 19, 2014 · High idle in Park and low idle in D or R :-(Jump to Latest a 350 with a comp camp, 600 Holley and Holley intake and headers. Full throttle to 6000rpm = 12. Determine if it's stalling due to a rich or lean condition. What I did was bump the idle speed up to 750, set the timing to get best vacuum at 750 and adjusted the throttle blades to see 5% on the idle air solenoid in neutral. , 244, 244 @050 I can also back the idle speed screw off all the way and still have it idle, albeit at a much too slow speed (high initial timing helps with this I think). Jul 15, 2020 · Originally Posted by Danny Cabral Sniper EFI Replacement Sensors - Auto Parts Store CTS Sensor: Standard Motor Products TX3 TPS Sensor: Standard Motor Products TH191 IAC Motor: Standard Motor Products AC416 WBO2 Sensor: Bosch 17025, 0258017025 (LINK/LINK/LINK/LINK) (The Sniper EFI 2 bar MAP sensor is internal with the ECU. When you punch the gas it was backfiring through the carb pretty consistently, although after rebuilding the carb and adjusting the timing a little it's rarely doing that in neutral or park. Could it be a cracked or warped metering block,bad meter block gasket,or possibly prim float adj too high/rich or defective leaking needle & seat or bad float? Mar 1, 2011 · Holding the brake, i can feel the car trying to surge forward. 5 on the AFR gauge I can get the fuel smell to lessen, but the idle is rougher and the vacuum is lower - 15" or so in park and 10ish in gear. If there is a fly in the Holley High Idle RPM When Warm. Made an amazing difference. The idle was a couple hundred RPM lower (600 instead of 750-800 like I had it set). Its really ticking me off. It needs to be measured exactly as written on the rebuild May 9, 2015 · I removed to 2 plugs and no surprise they were white. 5) Car consistently idles correctly after a key cycle. SBC dies when shifting out of park/neutral. When setting the choke idle start on the highest bump on the cam, set the desired idle speed when cold. I was able to drop the idle to around 1,000 by adjusting the idle screw, but that's Also, seeing a huge drop in RPM between park & drive, which it doesn't seem to be able to compensate for. How is your timing and idle vacuum? I found with my setup, it's a 383 with a small blower, that if the the idle vacuum dipped below 10 in/Hg, the idle became erratic & stalled. 18 degrees initial, 36 total. Shoot some carb cleaner down through this hole and see if that repairs the problem. The carb has 4 corner idle adjustment. I always adjust them in neutral or park . As far as off idle try closing the secondary blades all the way, open back half turn from seated, open the primary to set idle speed. Seriously "raining" fuel from the two front venturis. Jump to Latest IAC hold% I set to 10% above whatever the IAC goes to in drive warm. 5 in it low vacuum because Oct 6, 2013 · Gonna pull it off tomorrow and check primary throttle blade position and most likely end up opening the secondary's slightly to help improve idle. Sep 4, 2022 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. The engine will not idle with the mixture screws out 1. Changed inline fuel filter, carb filter. Th200-4r, tci breakaway converter and tci lock up kit. The idle curve was off at -40°F which has been remedied, but didn't seem to help. That combo properly tuned will Idle at 750 rpm in gear and about 1000 rpm in park Feb 20, 2018 · With the 2 bbl holley it has a smooth stead idle in park. Jan 8, 2023 · This is why a datalog is useful. Primary bleeds: High speed = 0. The goal is, set the carb up such that with the curb idle speed set properly, the pri throttle blades are in the correct relationship to the transfer slot, so that the transfer slot can transfer. If your boat is stalling when cold you may well have a carb problem, but there is no fast idle adjustment, and you definitely don't want a fast idle anyway. When we turn the idle mixture screws, they do nothing, we run the car with both of them turned in, and it doenst even shut off. no hesitation, no smoke, great throttle response, etc. Adjust idle mixture (either use a vacuum guage or adjust for highest idle speed) 4. I have played with the idle screws and they are where they should be, I can play with my curn idle screw to up the idle and then re-adjust my accelerator pump arm. When I put the car in drive, it dies flat. The adjustment procedure is exactly the same except that all four idle mixture screws are adjusted instead of just two. Now you know the range that the curb idle screw can be adjusted. If you do have to park it, be sure to flush May 25, 2021 · 3) Unplugged the IAC motor while the high idle is happening and no change occurs. Turning them can significantly affect engine performance. While no rough spot exists in the range of throttle movement, it stays slightly open only when the engine is running and Oct 4, 2023 · Then try a new IAC motor. On cruise, the AFR is 11-12. If I open the rear a little more to get it to idle a little higher in gear (say 850rpm) it runs to high in park (1400+), and as there is no adjustment left on the front I can not bring the idle down. 9 AFR, literally eye boiling. I ordered the #75's from Jeg's Oct 11, 2014 · "A typical Holley 750 double-pumper 4150-style carburetor is generally fitted with an idle-feed restrictor of 0. Thread starter Abe Jauregui; Start date Jun 23, 2022; Abe Jauregui Newbie. IF I nail the accelerator it is fine, no lean spot. I got the specs for all the orifices from Holley, and it seems unmolested. But the white plugs would be expected would they not, with high idle, vac leak, lean carb etc. The idle air bleed is the one located on the outboard side. The Target Air/Fuel Ratio Table & Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Then about half way through my drive I moved the VA line from the full manifold vacuum port on the carb to the ported vacuum port and continued driving. then at warm up mode I try to keep it around 1500-1800. 543-105 Sniper EFI Idle Air Control Motor (IAC motor) . My first few attempts to start it resulted in carb backfire due to the idle mixture screws having not been set. Offline: TBI Slant 6: Joined: Fri Nov 06, 2009 2:18 am I have had the same problem with Holley carbs on 273's They have all been vacuum leaks! I usually take a can of Mar 8, 2021 · No issues with the high idle. Until it decides to high idle again. If it does stick at a high idle use the handheld and see what the TPS reading is before and then after you blip the throttle. I was wrong. Aug 29, 2018 · Today I'm going to give you some tips and tricks on setting the choke adjustments as well as the fast idle on a Holley carburetor. It pulls about 14. , I joined this forum for the exact same high-idle problem. It seems to like this much idle speed better than when it is set at 850/650 rpms. Wants a bit more with that cam , Nov 24, 2020 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Get timing in the ball park. and 2) changing the idle air/fuel ratio, would be where you'd go to get the best vacuum/smoothest idle. 5 turns from the full stop (highest idle). Billet blocks have no advantage over (old school) OE Holley blocks. 0-11. I have mine set to 13. The front PV is a 6. I have increased the shooter size and pump cam to previously rectify a stumble. 08 rear. If you need to set the choke, maybe because you don't have the original settings or Nov 3, 2015 · The slot should look like a little square below the butterfly. May 14, 2018 · Marked as 3310-2, also has a large "99 CS" stamped on the body, with the C and S overlapping. The car will idle in the garage for an hour and barely make it to 180 degrees, but at the track within 5 laps the temp is 230. I try to get the IAC to 0% in park warm. My carb is a Holley 4bbl 600cfm, and I read that the factory idle screw setting was 1. 070 inch. I thought maybe I messed up setting the secondary idle screw, so I removed the carburetor and readjusted it according to Holley's specs and reinstalled the carb, but that didn't make I thought for some reason "warm" maybe meant 188° instead of 160° as Holley states. 3. I figured the problem was it was leaning out. It came back down to where the idle was set every time. Dec 18, 2014 · The carb is a Holley 670 street avenger with the 6. Jun 24, 2003 · The other day I was playing with an old O-3310-3 carb that had a 6. This will make the primary transition more active, respond quicker. I though that might be a Carb Shop stamp as they are in the neighborhood of where I bought the carb (Missouri). 11-23-2020, 09:09 PM. My idle mixture screws would not adjust too much as it was just to lean and from my experience its better to go up or down . Post subject: high idle. Billet blocks with a high idle jet have a disadvantage until the jet is moved to the bottom of the idle well. Borrowed Dad's 750 DP with a Proform main body. Only issue is the off idle hesitation it will die & backfire if you hit it from a stop, but if you pump the gas to get it going it will then run. 037 inch, and the idle-air bleeds will measure between 0. Reinstall the carb and when the engine is completely warmed up reset the curb idle. 5-15 according to a wideband I installed, but it idles high, even at the bottom of the curb idle adjustment (1000 rpm). To lean WOT without messing up the AFR in the midrange, should I be Demon carb's idle too high. When in park, the idle jumps up to 1,600 RPM. May 20, 2002 · Each metering block changes idle mixture and secondary volume. Jump to Latest 8K views 7 replies 4 participants last post by dogsofworr Nov 19, 2016 · The idle down channel can be tapped to 8-32 and brass set screws can be used has jets. Fires right up and runs smooth except for it idles at 2k rpm. Save Share Like. 5" in) and it kept idling like it had a vacuum leak - no matter what I did to adjust it it would idle real fast in Park/Nuetral and drop way down when I put it in gear. Feb 27, 2018 · New holley 600 Vacuum secondary carb, checked for vacuum leaks (non present that I could find. Key Takeaways Aug 15, 2006 · Gotta tell you all I though I was the cat's meow when it cam to tuning Holley carbs. How high do you rev your engine?? the 75--83 jets should be real close for that carb-- I would go up to at least an 850 carb( Holley ) I prefer the Demon carbs, which flow much more than the rated CFM would indicate-- an 835 Sep 19, 2016 · 12. Hello, Fairly new to carbs over here 302HO with TFS stage 2 cam, Edelbrock intake, and a Holley 600. I did notice that the throttle won't close fully while Today I'm going to give you some tips and tricks on setting the choke adjustments as well as the fast idle on a Holley carburetor. 9. I was able to drop the idle to around 1,000 by adjusting the idle screw, but that's Nov 7, 2001 · The high idle screw and bump cam is on the passenger side of carb, behind the electric choke assembly. 5 days ago · Addressing high idle in park is crucial for fuel efficiency, preventing engine wear, and avoiding safety risks. The fast idle will not kick down all the way after the engine is warm, it is hanging up on the last step of the arm. Idle in park is set at about 925 rpms and drops to 725 or so in gear. It ran well for several years. ) When cold, the engine will idle as it should at around 1100-1200 RPM. I have the new road demon and i cant get the idle to go below 1000rpm. I have tried different power valves and smaller jets. You still have to remove the carb top to change them, but makes the idle circuit very tunable. the idle screws are to the point where if i The 62 GT I bought last summer came equipped with a Holley O-8007 390 CFM carb. Need to keep giving it gas to keep it running. the car's been sitting since then and so my memories a little fuzzy on that). Spray carb cleaner around carb base plate while running May 23, 2012 · 1000 in park may be a little high usually its about 700 to 750, try to get about 475 to 550 idle RPM in drive (set the parking brake) this is the correct way to set the curb idle speed for an auto trans car the lower you can get idle the better if it will idle smoothly and is easier on the trans when you put it in gear. It starts up fine and never stalls out. I have run this engine for a total of 10 mins. These carbs employ two more idle mixture screws on the secondary side of the carburetor. Nov 16, 2010 · Even though most “street” Holley carbs only have idle mixture screws on the primary metering block, almost all Holleys have an idle fuel transfer passage that discharges idle fuel on the secondary side as well as on the primary side. The screw is a little hard to get to unless you have a aftermarket manifold then its a not to bad. This can also cause Sep 23, 2010 · It jumps up to 600 with the A/C off and about 800 in Park. float level good. I have a Holley 3310 750 vac sec. Your idle timing may be a bit high at 25° and going above idle the engine may not like 25° to 29° of timing. As you would expect it runs with a very high Feb 21, 2018 · One quick slayer carb is pretty rich already out of the box and is setup for a bigger cam with more overlap etc and having two on one engine that might be a little too much as on my 350 build I have a modified 650 holley double pumper converted to a 4 corner idle and a mild hydraulic roller cam setup and I can actually close my two primary idle Mar 11, 2022 · With normal Holley carbs, the carburetor must be removed and inverted to access the secondary throttle stop. That was a dumb oversight. about 12 degrees initial with vacuum advance unplugged then plug it in and dial roughly to 36 total and then check the idle. Mar 27, 2014 · I have the holley 4150 hp 830 cfm annular booster carb on my 408 sbc. it idles around 1500 to 1800 rpm and it is tearing the transmission apart. May Jul 18, 2020 · Holley Terminator x high idle problems. May 24, 2005 · I have a 67 Chevelle with a 396 that runs way too rich at idle. It now idles around 12 and has a WOT AFR in the 13-14 range. Mar 16, 2010 · So, I bought a Holley kit and cleaned the carb out real good with carb cleaner. I had to idle it at 2,000 in Park to get it to idle at 800 in gear. 10 vacuum but not at idle. If the TPS is sticking and above 2% it will open the IAC to the Hold Position which will cause the idle to hang. I need to see what vacuum I pull in park at idle. This makes your carb have a fully adjustable idle circuit. If your Holley carburetor is equipped with four idle mixture screws, the procedure will be exactly the same except that the additional two screws will receive the same attention. Aug 21, 2016 · On my idle I have my primary idle set around 800 rpm and it drops to 700 rpm in drive and anything less it does not like regardless of what carb I put on my motor. May 30, 2005 · My 750dp will idle in park with the sec butterflies cracked and the primary backed right off (front not open at all). It’s brand new. 070 and the idle restriction is supposed to be . the upper idle restrictions are ones he added i think because the originals were the tubes in the main wells. 5, 1000 RPM, but it doesn't seem to like it. We drilled the idle jets from a 28 to a 31 and it brought the idle down. It wasn't as bad with 61 jets and the original power valve, but still would run pig rich even with the idle adjustment screws Aug 24, 2007 · If a Holley is dripping at idle, you know the throttle blades are open too far. I give it a little more throttle and car runs better. Sep 2, 2005 · Idle in Park Good. Buy as many books as you can on tuning a holley carb and make sure to read up as much as you can and see how each area works on the carb so you can understand and gain more experience. The "stuck" throttle issue just occurred out of the blue. Feb 17, 2021 · The idle mixture screw (A) area pulls fuel from the idle feed restrictor located on this metering block at arrow B. It almost seems like a vacuum leak, except for the way it loads up down low. Once you get the curb idle setting fixed you may also have to reset the fast idle and adjust the accelerator pump. 4) Cycled the key with the IAC motor unplugged during high idle condition and the high idle condition continues when cranked back with the IAC motor unplugged. Oct 14, 2016 · Idle is set at highest vac ,Idle screws are about 1 turn out and turning in does have a strong effect - they are working well. Jump to Latest 11K views 11 replies 5 participants last post by Camaro6666 May 31, 2001. By following preventive measures and conducting routine inspections, you can minimize the likelihood of experiencing high idle in park. Much like with a carb, you probably can go back & forth adjusting each, and get decent gains Oct 20, 2013 · Kinda pissed that the near new Holley that I just bought for $100 already has the IFRs down at bottom of metering blocks, and the brand new $500 QFT carb doesn't. Nov 15, 2004 · I have a 600 CFM Holley vac secondary sitting on a mild 306. The curb idle screw is backed out to the point of not making contact any longer, so I can't adjust it down that way. Royce When I received it, it came with . Jul 17, 2005 · 600 CFM 1460 holley carb. (Image/Jeff Smith) brawler carb it will not idle only only high which when put in gear stalls with engine rpm’s up goes great thinking of drilling 4 3/32 holes and change out power valve to 4. My 406 with a 600+ lift cam is at 950 park and 650-700 in gear. it stays high idle until warmed up and throttle is snapped off and curb idle takes over. Jul 27, 2015 · Replaceable idle air bleeds (yellow arrows) are used in the top-of-the-line street and race Holley carbs, making a change easy. There is a detailed adjustment procedure on here somewhere for the carb adjustment procedure,I'll try to find it and post it. Install the carb with . It idles and runs so rich that I have black soot blowing out the tail pipes, can be seen in the photo; Before I knew this was a 350 CFM carb I assumed it might be over carburated but this carb should be suitable for a 289. Idle air bleeds are . The engine does have a mild cam in it, no timing control is done with the Holley. Its a holley 4160, jets are 66 and power valve is 1 0 5. Actually, the float level could be too high too. If I tune the carb to leaner than that - say 13. If the idle mixture screw still does not respond, then the carb may need to be disassembled and cleaned. Dec 5, 2016 · I put a PERFORMER AIR-GAP (IDLE - 5500 RPM) a carb spacer plate and a Comp Cam part #12-246-3 cam with . I set my idle in park at 850, so it drive it goes to 650. Starts up fine but won't idle low or high rpm. May 10, 2008 · it didnt seem to make much difference when i increased the idle restriction in the upper part of the metering block thats why i started to question what had been done. 3L SBF, Dart SHP 8. Many Holley performance carburetors are equipped with what is called four-hole or four-port idle mixture control. It will stall if I don't feather the pedal. Readjust idle if neccessay using REAR throttles again. its an older carb. I'm gonna replace the plugs and wires next. May 30, 2013 · Holley four-barrel carburetors are probably the most common high performance fuel mixing devices on the planet. Nov 10, 2024 · Throttle shaft wear can create vacuum leaks, resulting in an unstable idle or whistling noise from the carburetor. The idle quality "feels right" at these settings. Sep 2, 2022 · I’m using a ln AED Holley 750 HP unit. I’ve cleaned the floats and tried adjusting them and the mixture screws. 5 (correct for engine's vacuum) Car is at 4500-5000' altitude. C. Took the Nova off jack stands after a pile of work recenty. Mar 6, 2022 · The letting of the idle studder problem I have never encountered that problem before and would like to hopefully figure out what the deal is as it happened even when it was super fat and had not adjustment on the idle mixture screws on the previous old carb and also now when with it being in park while holding the throttle open steady at 1500 Mar 9, 2023 · The best way to set idle on a Holley is to remove carb and set the curb idle such that there is a square hole about . When I adjust the idle mixture screws to highest vacuum, 21 inches in park & 19 in gear and smooth clean idle, I'm at 10. The cam is a 292H Comp hyd. If I adjust screws in to get into high 12s to mid 13s idle becomes rough, low 14 screws 1/4 turn out and idles real bad. 5 turns, without rich black smoke with all possible adjustments to the idle speed screw. Set your mixture screw back to best idle. I'm told that is allowing too much fuel at low idle and that's what is likely causing rough low idle and stalling in gear. The carb is also very new. I finally got the idle straightened out, but it required turning the idle screws out to give the best idle in gear. . Jun 23, 2022 #1 Ok, I have a 70 bronco with a 600 cfm Holley truck avenger electric choke. 5 PV, 75/80 jets, . I have a Chrysler 360 V8 in a 3800 lbs car and recently squired a 670 Street Avenger. The curb idle is set with the idle speed adjustment screw on Just installed a new Holley I’ve been trying to adjust it for a few hours, but the best I’ve gotten was running, but with a super high idle. If you need to set the choke, maybe because you don't have the original settings or With the engine idling in Park with the emergency brake engaged, the first step is to set the idle speed at the desired rpm. If the idle speed is set properly, then it's not "high", by definition. Sep 3, 2013 · If you have billet blocks, move it to the bottom. I swapped it out to try the Holley street avenger I have and it runs great and seat of the pants gain is noticeable for sure however at idle in park the rpms are jumping up and down by about 50 and it tends to be worse as soon as I start it up. The distributor Mar 27, 2011 · It sounds like the idle circuit in carb has problems. 1 to 10. However, now it smokes a fair amount. It could be the smallest piece of dirt on the plate or a piece of gunk on the idle slot. Throttle hesitation from idle is gone. 45 posts · Joined 2001 Add to quote; Only show this user #1 · May 29, 2001. new in 91. Jul 10, 2020 · Now with this set up I have some problems. e. previous high reading was 8". Louis Park, MN Car Model: I have always had a problem maintaining a reasonable idle speed. i did the the idle mixture screw trick to check the power valves and there good. holley 4010 carb The carb. My problem is after the engine comes up to normal operating temp 4/ U need ball park 14 to 16 degs at idle which means with 10 in the VA an intial around the 4 to 5 degs. If there is a fly in the Hello, I have a Pontiac 455 which I recently installed a Holley 770. Every carb I put on this engine does not make any difference. Cruise in high gear 2000-2750rpm=13. Joined Apr 21, 2021 Messages 100 Loc. 23 rear gear. All went well for a while but once again I stopped, put it in park and the idle was high, timing at 7° and IAC at 0. I don’t understand why anybody would fool with a high idle jet if you don’t have to. 5-2). K. 2. I wanted to see if the floats were set correctly but where there . Given the sheer numbers of carburetors made since the 1950s, you know they work. 4/ U need ball park 14 to 16 degs at idle which means with 10 in the VA an intial around the 4 to 5 degs. The car does accelerate better now and runs good while driving. 050 idle bleed. Checked all vacuum lines, adjusted floats Primary & Rear. [/quot I know that but the idle is set so high just so I dônt have to 2 foot it as much when I put it into gear. 5-4 turns out, instead of 1. I have a full 14V when the engine is running. Had a problem adjusting the idle down from 1050 to around 870. Jun 9, 2013 · Once idle is established, adjust idle screws in for highest idle, even if higher than desired. 5 in park 1000 RPM, but there's no telling what it drops to with my 2500 stall and 700 rpm in drive Aug 27, 2016 · It will take more timing but then my idle is too high. Since I get max vacuum and idle speed at 3/4 turn on the mixture screws, it sounds like my idle circuit is a bit rich. Very rich all around, at idle, or especially at throttle. I've found a reasonable idle with all four out one turn. I wouldn't say a lot, but more than I like. Oct 21, 2008 · Idle air bleeds are . It hurts my eyes just to stand behind the car while running. 5 comp, Holley dual plane, Voodoo 60103, Accel HEI, short 1 5/8 headers, 2 1/2 duals, stock converter, with 3. If you have a regular carb, the air bleeds are press-in (red arrows) items, so changing them is limited to drilling larger or Rough idle, high idle in park, stalls in gear. (to others, notice I didn't say "carbs too big"), lol. Feb 20, 2020 · Somewhere on the carb will be a number that starts with List- or R- with that you will be able to look up the specs and see what you have. Also, the IAC Position is supposed to increase when you shift the transmission into gear (). Right now I moved my vacuum advance to ported to bring the idle a little. Try running them way out also, the engine should idle way rough and maybe even stall. Sometimes the "neutral" area of the Base Fuel Table is fine, but the "in gear" area needs to Feb 27, 2005 · FYI- Every Holley carb I've ever "cured" of the flat-spot was way out of proper adjustment or was mis-timed. (i. Regular maintenance plays a significant role in preventing high idle issues. When it was at around 1 it would jump to 9 then back down, it was quite noticeable that this was affecting the idle (not having a smooth idle). If I lower the idle the engine stops. Timing is 24 at idle, 36 total. If not, possibly the idle jets inside the metering block may be too small. If I adjust screws in to get into To adjust the idle on your Holley carb, locate the idle mixture screws. Leaning-Out a Holley 650 Double Pumper’s Rich Idle Fuel Mix” william spratlin Ken says: Oct 13, 2023 · I have a 72 Newport 400 with a NOS Holley 2210 and it idles way to high around 1800RPM in park/neutral when I put it in gear it calms down a little bit not much. May 29, 2001 · another note on the mixture screws. 067 main hole and a. 5:1 A/F off idle to 2000 rpm in park. is a holley 4010 (84013-3) 750 CFM. 036 high speed air bleeds front and rear and 75/83 jets. 047", . Feb 24, 2023 · Yeah I understand where your coming from but on Holley carbs they have idle discharge ports in the front and also the rear that constantly feed the idle circuit and that on looking on the rear below the transfer slot you have constant idle feed discharge ports though small in size compared to the primary side on a 2 corner idle holley but I Jun 23, 2022 · Holley Carb high idle. We had a 390 holley on a 289 hat idled way high. Dropped in a new 4bolt main 350sbc instead of the 307, beefed up the stock powerglide, upgraded the mono leafs to multi leaf, changed the 10 bolt 8 inch rear The carb has a manual choke and I hardly use it, but yes it happens when engine is cold and warmed up. 035" squirter and blue cam on 2. Car runs & drives fine, and will idle at commanded speed when in gear, but the idle will rise to 1200-1300 when in Park or Neutral. Ensure the spark plug wires (or any other high voltage wiring) aren't too close to the IAC motor/wiring. So I set the target idle to 1000 rpm on the Sniper. In Park idle is about 950 rpms, in drive about 750. Most 600's have a 134-9 secondary metering block. I thought the carb had 65 jets in it, so I figured I pick up a pair of 67 and see what that did to it. 5 ; How its currently tuned: Idle air bleeds - 75; High speed bleeds - 35; Primary jets – 67; Secondary jets – 75; PV – 6. 2 block, Eagle 3. 070, idle Apr 20, 2024 · I have a question about this carb, and wondering if anyone else has experience this little issue before. With the engine idling in Park with the emergency brake engaged, the first step is to set the idle speed at the desired rpm. If its too Aug 22, 2014 · Specs SBC ,lunati voodoo hydraulic roller cam 270/278 219/227 @50 515/530 lift with dart shp 180cc heads with a holley 650ish cfm VS with high rise intake hei distributor with vacuum advance on full manifold I shoot for a 900 rpm idle in park and drops to about 700 and anything lower the engine shakes a little regardless how much I adjust the idle mixture screws Aug 27, 2019 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Bought new throttle plates with no holes, put them in the carb, bolt it back up, and now my idle is really inconsistent. Check your float level sounds like your too high and fuel is being pushed out the bosters at (idle). Trans is a 727 that was converted to run with a lock-up converter at the advice/decision of the guy that built my trans. Adjust idle speed. Most of the time with the 4 corner idle carbs I seem to end up with the primary idle screws 1-1/4 turns out and the secondary 1 turn out. 5 A/F, vacuum=0". The only way I could get it to idle, was with both mixture screws fully closed (seated). If your idling O. I have a Holley 650DP that will whistle at idle because of that, as soon as I move the throttle at all, it goes away. * Also, give your idle and high-speed air bleeds a shot of carb cleaner. , 244, 244 @050 May 6, 2013 · I finally got my new Edelbrock manifold and my new Holley 4160 carb installed. I Jun 2, 2012 · The Holley has two types of carb choke operation, the later electric one should fit okay, needs 7 volts to energise. WILLING TO SELL RIGHTS TO AVATAR FOR ONE FREE ECU. Yes the adjustment for the holley secondaries (set-screw under the carb on the secondary side Nov 7, 2015 · I read an article in Muscle Machines magazine about how most "universal" Holley carbs have an over-rich idle circuit, and how at steady, low-load road speeds, the transfer slots are doing the fuel metering. I’m using the PCVon the rear of the carb. So, it would be a start to make absolutely sure that the float is set right first. Didn · Just like Gary C. 034 inch, an 850 will have a slightly larger 0. Main boosters normally will not start flowing fuel until the engine starts to turn 2000 RPM or so. 040" of the slot is exposed. can cause silent detonation at idle, and even run on, and unable to tune carb mixtures and idle speeds, too high engine vaccuums sucking (forcing) to much mixture. If you need a bit more rpm to maintain an idle with the primary Apr 4, 2009 · C3 Tech/Performance - Holley idle slowly dies - Have a holley 750 dp mechanical secs. I got it to idle at 20. Jump to Latest 4. 020" of TS exposed. Jul 30, 2022 · The IAC Position is very jumpy at idle. 025" Idle = 0. (20-30° idle timing for high performance applications). As it turns out ths carb had 64. The rich condition must have helped make the excessively high advance possible. This is a 750 cfm Holley carburetor that we’ll be using to set idle quality on a small-block Chevy on a test stand. I have a lean spot off idle but let me be clear. timing i 10 beforo vaccum is Dec 13, 2021 · This Q&A article will explain how to optimize and tune the fuel/air mix of a Holley carburetor to improve your engine performance. May 23, 2017 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Camaro6666 Discussion starter. Jul 30, 2007 · Re: Diagnosing Holley Idle problems- Could drilled butterflies cause it? Sounds like your on the right track ans Sen from SMI will stick with you unitll its right. I had to up the "in park idle" to keep the in drive rpms high enough not to stall when in gear. My original problem was that at 70+ MPH or lightly accelerating on the highway it would surge. May 17, 2002 · Engine Mods - High idle problem with a new Holley Street Avenger - HELP! - I have a new Holley Street Avenger on a new small block in my '75 that I just got from the shop yesterday. The throttle adjustment is backed all the way off, the primary valves are closed, the choke is opened all the way (i manipulated it to stay open to eliminate it being a choke problem) There is no obvious vacuum leak, my vacuum Jan 25, 2008 · but hears the deal it a holley 4160 single pumper 600cfm looks NEW and when you punch it in drive or park it coughs/or backfires fire threw the carb but usualy cough and dies down and then usually goes back to idle. 020?(should look square) Idk just a guess. It try to adjust it, the car dies, If I leave it in the park position it is fine as long as the timing stays at 16 degrees and it is at 1200rpms. The engine idled happy around 1000 RPM with the old holley 750DP carb. Idle vacuum in Park was also up near 10" which is highest ever with the new engine. If you have a regular carb, the air bleeds are press-in (red arrows) items, so changing them is · The carb's are designed this way to prevent boats from being put into gear with the engine revving higher than idle speed which would cause people to ram docks, trailers, other boats etc. Let’s choose 850 rpm for this application. Seems to be an older zinc model with 2 corner idle. Threaded idle tubes can be bought from Allstate Carburetor and Cliff Ruggles. The fast idle adjustment is barely engaged. 020" of the transition slots exposed. So now I have a stumble at mid-high range. Jul 23, 2007 · Besides smelling rich, I can pump it twice, start it cold with no choke, hold it at 1500 for 30 seconds and it will idle at 950 in Park. 6:1 A/F, vacuum>18". Recently inherited the car and have dove into it. Added a Fuel Pump Regulator & Gauge. I have a 355, extremely mild with a Quick Fuel BD 1957. I think that should get you in the ball park, of course once you start driving it, you may (probably will) need to make some adjustments, to get the best performance out of it. 5 turns out from 100% lean (all the way in). If I put it in park, the idle drops to 550-600 and the AFR leans out (pegged at 19. 5" PV (got lazy and didn't put my 4. My Holley carb is a 2bbl OE replacement on a Ford 351W. It drives like a dream and starts up great. Aug 12, 2016 · The 350 has a Holley 4160 carb. Boosters do not drip, front bowl is level with bottom of plug, rear bowl just above the threads. I can get it off high idle by pushing the arm down with my finger but as soon as I touch the throttle it hangs up again. the Holley DVD says the idle will follow the idls speed down as it opens. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FTI Comp Ported intake, BBK 80mm throttle body Oct 9, 2022 · Just wondering what people have their target idle AFRs set to, with a large aggressive cam with overlap. An improperly functioning IAC motor can also be an electrical interference issue. Although, I'm open to tips and proven methods other than just sight and sound). The carb is responsive to idle adjustments when idling in netural (front/rear idle speed adjust, and idle mixture), but it seems to want more idle mixture than before (like 3. Save Share Reply Quote Like. Engine Mods - High idle problem with a new Holley Street Avenger - HELP! - I have a new Holley Street Avenger on a new small block in my '75 that I just got from the shop yesterday. 470" forged steel crankshaft & H-beam rods, Wiseco 4. Post Posted: Fri May 07, 2010 1:04 pm . Thus, Holley can not guarantee an answer or timing on an answer. The ignition is a Progression Ignition small cap unit. That is a reverse idle carb that needs to have the float set off the car. Feb 1, 2010 · Ok I put timing in it, 36* at 3000, its a 700 holley it had 67p jets and 74s jets I went to 72p and 78s car runs a lot better but I still have the idle problem in park it idled at 18-1900 rpms and in drive foot on brake it idled at 1000 rpms and it seems to idle good at 1000rpms, it also smells real bad, eye burning bad do I need to go up more with the jets or should I try a bigger Jun 16, 2011 · Also, I run power brakes. My issue is when its warmed up and driving for a while when I Dec 14, 2007 · Or, how any of what we've discussed here will create a "high idle". Not too much creep in the transmission when stopped and in gear, but enough to move slowly forward. Jul 26, 2020 · '92 Ford Mustang GT: 385"/6. I'm sure the problem is in the carb because I put an old borrowed 750 on and never goes Feb 26, 2008 · I bought a 1990 Chevy 1500 pickup several months back. My problem is after the engine comes up to normal operating temp, the idle RPM will generally end up at Holley four-barrel carburetors are probably the most common high performance fuel mixing devices on the planet. I intend to work on through the idle cams and secondary springs Carb comes stock with: Idle air bleeds - 71; High speed bleeds - 31; Primary jets – 70; Secondary jets – 74; PV – 6. On a Holley carb there are two air bleed holes for each venturi. 078" Secondary bleeds: High speed = 0. The air bleeds are still stock 73 idle and 33 high speed. 90lxhatch93 Discussion starter. 067 and 0. So here are the things I have tried/checked: For an auto in gear idle is around 500-800 rpm, in park its like 800-1100. 5 it has 6. I even used to have an older 4150 that did the exact same thing. By increasing rpm, adjusting idle screws, lowering rpm, re-adjusting etc. - I am trying to dial in my 4160 600cfm Holley carb. 002 sizes at a time as it allows more of a change compared Jun 20, 2020 · Okay, so I put a vacuum advance distributor in my car where previous owner had mechanical only. Holley replacements were normally manual choke 7508 or 9112 series 350 carbs. * I rev it up and the idle comes down to about 800. That should get you close enough to tweak with wideband if desired, but IMO opinion, that carb is larger than necessary for that combo. Were you adjusting the carb when it started? You might have moved the plates, by adjusting the idle, just enough to start the whistle. I have checked all vacum lines and replaced the oxygen sensor on the exaust, also replaced the intake manafold gasket and the Idle air control IAC, I have run OB1 diagnostic and only code 12 present. still high idle in neutral and stalling in gear and rough idle. John-TC#2226 - 1971 SS350 El May 2, 2022 · Originally Posted by Danny Cabral The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software: In the Sniper EFI software (), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple"). 210 posts · Joined 2011 Add to quote; Only show this user #1 · May 3, 2020. I readjusted my idle with the engine idling at 190° and drove the truck. 031 idle hole. Idle was too high even with plates full closed due to new timing and holes in throttle plates. Over time, wear and tear cause the throttle shafts to let air in, disrupting the air-fuel mixture and impacting drivability. Mar 8, 2023 · Many Holley performance carburetors are equipped with what is called four-hole or four-port idle mixture control. I'm guessing the transfer slots are over exposed since my idle is so high in park, and I now notice a miss at cruise just touching the throttle. Note that locked out race engines idle high toand has the cylinder Replaceable idle air bleeds (yellow arrows) are used in the top-of-the-line street and race Holley carbs, making a change easy. May 20, 2020 · Stalling in gear or at a stop: In the Holley EFI software (), look at where this happens on the Base Fuel & Timing Tables. I would have thought tuning idle with four screws would make thing easier. 028" Idle = 0. The stock Ford 2100 and Stromberg WW carbs as found on early Aussie 250 and 302 2-bbl's have just enough space for there auto choke. Adjust your idle once again to set it where you want it. S. Shaker455. I can get the idle AFR to 14. idle screw. Was just on the Holley site which said my carb should have came with #75 idle air bleeds (leaner) on the primaries' and mine came with #71's (richer) out of the box. Jump to Latest This is a 4780 series Carb with Mechanical Choke, that I feel that I have dialed in very well. 02" the idle rpms are a bit too low for my liking. where May 15, 2009 · I have this holley 4010 750 on my 455 that idles fine in park,screams at wot,but just doesn't like to idle in gear. A 134-9 has a . Holley Carb - High Idle. I've rebuilt the carb TWICE and it still runs rich at idle. it does not look like they were Your whistling sound may just be the air passing between the throttle plates and the carb body. Checked and double checked spark plug firing order and verified timing mark at true TDC. 490" lift and 230°-236° duration, and the required valve springs 981-16. Following the linked article I extended the IAC to 100% sprayed with carb cleaner and back to 0% while spraying with carb cleaner. The high idle has not returned for a couple days now, but given Jun 24, 2012 · 289ci with tunnel ram and dual carb #9776, 450 cfm each. 030, 9. IMO, there is no "Holley flat spot", but there are plenty of people who don't know how to properly tune them. This will close the primary throttle blades at idle and prevent fuel from being pulled through the transition slots which I promise is causing much of Apr 16, 2015 · I'm having basically the exact same problem with a new Holley 4160, I just purchased on a 351 marine engine. High-mileage owners on forums like Camaro Forums report idle issues directly linked to throttle shaft leaks. I don't have a rpm gauge on it right Jun 28, 2002 · IT will idle at 1200rpms but the timing is at 16 BTDC NOW. If you have no booster leaking and the air bleeds are clean, hook up a vacuum gauge and read the vacuum at idle, then carefully note Sep 23, 2020 · The current power valve in the Holley carb is 65 which opens at 6. idle drops from 950-1000 to 650-700 when put in gear, but much Apr 13, 2006 · I finally got the idle straightened out, but it required turning the idle screws out to give the best idle in gear. Jan 5, 2013 · It could be one of the primary blades could be sucked by engine vacuum just enough to make it stick on the side of the venturi hole. Check the high idle screw isn't making contact too. 5 and the secondary power valve was blocked off so the jet stagger makes sense to me. here's the issue. Save Share May 7, 2010 · Location: St. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/. on a 350+. 040-. if I lower the idle rpm to get the t-slot nearer 0. Floats are set to spill out with a good push With the 2 bbl holley it has a smooth stead idle in park. This however Sep 4, 2011 · Engine is a 408 small block, 670cfm holley carb with a 1/2" phenolic spacer. 0). Let us know if you find out. Now it is running pig rich. yet i still have an extream high idle Jan 15, 2017 · Idle jet is huge for that carb, should be around . Turn the curb idle screw until there is about . Holley 1850 Carb List #80457-2 Rear Metering block conversion with rear block from a 4777 The idle screws were way too rich & the low irregular vacuum was causing the carburetor needle springs to bounce compounding the problem. and fuel pressure is set to just shy of 7 psi with an electric pump. 306 posts It can't lower the idle below about 2800 RPM. This means that the carb meters idle fuel and idle air through all 4 of the throttles – primary and secondary. In addition it appears that the mixture screws have no effect on the idle. 5" PV in it, 66's front, can't remember rear, but that shouldn't matter. If I get to 900-1000 RPM idle with the screw (showing 1-2% TPS before power cycling to reset TPS) & 0% IAC, putting it in gear causes the issue above. But my little issue is, after I drive for a while and then put the car back in park the idle is up to 900, if i give it a little rev its back to 850. And its good, sounds good, runs good. Before I change my converter the would idle just fine in park and neutral but the minute you put in gear it would just die. Background: 69 camaro. 028" Metering Block Stamped 5271 5275 3 Jun 9, 2011 · Because of the vacuum leak, I think I had the idle set a little weird to compensate for the bad vacuum (dealt with that a few years ago. I’ve played with both idle screws it’s currently as set at the lowest idle it Aug 31, 2024 · My 1966 289 Mustang with a Holley 4 barrel carburator will only run when I tighten the idle set screw 1. Also, the car won't idle when the A/C is on. 6K views 19 replies 6 participants last post by Curt C May 4, 2020. It's a Avenger 670 carb, put a 4. then you probably don't want to change your idle hole but you still may want to richen yor secondary hole, In which case you could try: 134-20: main = . Los Angeles. Jun 5, 2021 · Is there a choke on this carb and if so does its fast idle cam release so idle can be set on the curb idle screw? Holley’s typically have a secondary adjustment screw on the passenger side of the carb accessible from the underside of an external boss the secondary throttle shaft passes through. 033. What can cause this? I've tried this carb on another vehicle with the same results. By keeping rpms up you are taking carb out of idle circuit and you are simply masking another problem. The curb idle screw is not even touching the throttle linkage and my car is idling between 1500 & 2000 RPM in park, and 1000 RPM in gear. Any suggestions or ideas? Thanks! Dec 11, 2011 · C3 Tech/Performance - Holley tuning/ lean spot off idle slow take off. Curb idle in park and neutral is 975-1025 and in drive is about 675-700 ish. If you’re experiencing rough idling or stalling, When cold, the engine will idle as it should at around 1100-1200 RPM. The car was idling at 1,500 rpm when I got it home. The high idle screw has to be sdjusted to make up for the low idle Hi. qxxh jwbahs bcm bwyip wdbs wuoyrl rdcxc otzo bbqr zexfp