Holley stumble off idle
Nettet16. feb. 2007 · the problem is that the car has a stumble just off of idle upto approximately 2000 rpm but if you creep into the throttle softly it is not there, if you hit the throttle … Nettet3. des. 2024 · This shows the curb idle set with a large exposed portion of the transfer slot—this is bad and will cause not only an overly rich idle mixture but also an off-idle …
Holley stumble off idle
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Nettet3. des. 2024 · If your engine has an annoying stumble just off idle that you can't seem to fix, check the accelerator pump linkage. Lightly open the throttle linkage and watch the accelerator pump squirter... Nettet30. okt. 2007 · Anyway - the idle, off idle and just cruising around town part is great - no stumbles of hiccups whatsoever. The stumble, or flat spot, comes in when I put my foot in it. The motor hesitates for a split second and then takes off. It does this both while sitting in the driveway and stabbing it and while driving.
Nettet9. mar. 2010 · When the idle fuel restriction (IFR) and idle air bleed combination is balanced well, the idle speed will drop an equal amount whether turning in or out the mixture screw from it's optimal setting. If, the idle speed increases when the mixture is leaned, the IFR is too rich. Nettet8. apr. 2024 · If you have more than about 22° of overlap @ .050" you may want to turn learning off below 1100 RPM or so (basically 2 to 3 hundred RPM above idle) until you get it to idle the way you want. When you get the idle where you want it, turn the Learn back on, but Limit it to +/- 3% in that area.
Nettet31. mai 2024 · An off-idle stumble can sometimes be cured with more initial timing. Some enthusiasts feel that 10 -degrees initial is a maximum, but the reality is that performance engines with even a mild cam often prefer 14- to 16- degrees initial timing (and perhaps more) with a curve that quickly initiates after roughly 1,500 rpm.
Nettet22. okt. 2001 · Not only did it launch stumble free but it ran 2 tenths faster in the 8th mile. I have not given up on the Holley. I just have no clue what to do to it. I have asked …
Nettet8. sep. 2011 · Make sure the umbrella seal above the accelerator pump is good, if you didn't replace it, take it back apart and replace it now, then adjust the arm per Holley specs. It should move the second your linkage moves Also, make sure the check ball, actually bullet shaped, is in place under your squirter. helios 06171Nettet1. sep. 2004 · Instead of 16 to 18 inches of manifold vacuum at idle, many big cams will support barely 4 to 6 inches. This reduced vacuum requires more throttle opening to … helios 06371Nettet24. jun. 2012 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Thus, … helios 08166Nettet27. feb. 2012 · The low speed stumble happens at low engine speed when just stabbing the throttle or rolling on quickly to like 1/4 or 1/2 throttle from low engine speeds. I am thinking maybe a shooter is too big. Also, the exhaust is pretty smelly at idle, so maybe we can work on that problem next. helios 150/4NettetHow to fix Holley accelerator pump stumble caused by a sudden lack of fuel (or too much fuel) when aggressively opening your throttle. This particular fix (or adjustment) is … helios 08149Nettet18. apr. 2024 · Off Idle Stumbles 04-18-2024, 10:36 AM Was curious a good place to start with some off idle stumble when the car gets some heat into it. It seems like leaving a stoplight over 170° of oil or water temp it wants to stumble & hesitate. It's a 9.5:1 1400 RWHP E85 TT SBC, everywhere over 1800 RPM seems to be OK. helios 08157Nettet15. mai 2024 · Off idle lean stumble, sputters when holding steady off idle pedal. Have an issue where if I try to hold the throttle just off idle (not stabbing the throttle just slowly holding) the A/F ratio goes lean, I get some backfiring and won't hold a constant RPM. Open it up a little more and it will hold steady at 2000 RPM. helios 08323