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I'm having a hard time getting rid of a "stumble" that occurs when I throttle off of idle. It is most prevalent if I free rev the engine. It also happens when I take off in 1st gear. Its like a misfire for a second. When I first started tuning this car a couple months ago I figured I could just fix it without accel enrichment.
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Again the obvious first place to look for an off idle stumble in any carb. is the accelerator pump circuit. Interesting- I guess I will tear it down again and see if 9/16 works better. Have a feeling that I need more fuel in the bowl to fill the accel pump section a little more.
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It seems to run pretty good under acceleration, but it sometimes stumbles at "coasting" road speeds. I cleaned the 10 pin connector, the car now idles smooth.
Just brought home a week ago a 96 Intruder 800 with 13k miles on the clock and I noticed that she idles perfect - and runs out well but she stumbles a bit at low rpm (just off idle) but get the revs up a bit more (no tach so don't know what she's turning) and she runs out great again. Now I... A simple (quick test) is to crank up the idle to 900 or so and fatten up the idle mixture screws as others have suggested to see if something in transition circuit is not keeping up. If nothing changes, 1) check for vacuum leaks on intake/carb. 2) Clean the entire carb, replace all gaskets if you have not.
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May 30, 2016 · I've had an off-idle stumble with my 4MV quadrajet since I bought the car a few years ago: at a stop light / stop sign, pressing the throttle more than a little bit will cause the engine to stall. By feathering the throttle I can increase RPMs a bit, and then the throttle will work fine without stalling. Once it's off idle, it runs like a champ.
A simple (quick test) is to crank up the idle to 900 or so and fatten up the idle mixture screws as others have suggested to see if something in transition circuit is not keeping up. If nothing changes, 1) check for vacuum leaks on intake/carb. 2) Clean the entire carb, replace all gaskets if you have not.
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1. on idle it doesn't return to a low idle quickly when warm. When cool (1 minute idle) with the choke off, idle is good. 2. as the engine warms the off idle stumble gets worse. I believe it to be a too lean condition as if I open the air box a little (using a wedge and tape on the air box cover) the stumble is worse.
On/off IAC valves give you two choices: On fast idle, or off it. You’d set the idle speed set screw to your desired idle speed with the engine warm, and if your on/off valve is big enough, turning it on will keep the engine from stalling on a cold start. No closed loop control is possible.
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Dec 10, 2009 · 3. Turn ignition switch to “OFF” wait at least 10 seconds. Make sure that the throttle valve moves during above 10 seconds by confirming the operating sound. Idle Air Volume Learning (Throttle Position Learning) It is better to count the time accurately with a clock. 1. Perform “Accelerator Pedal Released Position Learning”. 2. Jun 01, 2012 · - Back idle screw all the way out till throttle plate was completely shut - Install TPS Sensor and rotate to the right just till it makes contact with the throttle plate shaft roll pin - Tightend bolts and did a TPS reset via ECMSPY - Set idle 1050 RPMS
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Off-idle Stumble Troubleshooting Advice. Jump to Latest Follow. A seemingly unimportant point is the idle speed, is it set to the recommended 950-1050rpm when hot? we sometimes find the off-idle...I have a wideband, but i have not drivin with it yet, i did set the idle to a 14.7 gas afr again, the stumble happens w/ a light throttle and light load, i dont think it is the accelerator pump circuit because the stumble happens at cruise at 2300 rpm and below.
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Letting off gas, idle stumbles almost stalls when car hot and AC on. Jump to Latest Follow 1 - 15 of 15 Posts. Y. yacoub · Registered. Joined May ... Off idle stumble. Jump to Latest Follow 1 - 14 of 14 Posts. P. predator_or_prey · Registered. Joined May 11, 2008 · 31 Posts . Discussion Starter • #1 • Mar 8 ...
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Apr 09, 2015 · I took my points cover off and I noticed that the isolator was loose. and when i move it down it crosses over with will cause the coil to fire every time this happens. Now i am not sure why it would idle fine then stumble when revving up the engine unless the vibration is causing it to cross over. I am hoping this the problem.
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