Low rpm misfire, Help!
07-20-2004, 10:29 AM
#1
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Low rpm misfire, Help! Hey guys, got a very confusing problem here. The car is a '94 z28 with 81k. Whenever the car gets warmed up and you put the engine under a load under 2,100rpms it will misfire horribly. High rpm and full throttle operation is flawless. On initial startup the car will run flawlessly also. It's only when the car is hot and under a load at low rpms. I KNOW it's neither the opti nor the ignition module. Both have been swapped with new units after the problem started. Spark plugs are also brand new. No codes, no other issues to speak of. The car will run full throttle all day long without skipping a beat. No other problems anywhere else.. Any ideas?
07-25-2004, 02:29 AM
#6
Hi only when hot then I would guess a sensor my well be out of spec. Just a guess.
If you have acsess to scanner i would see what the tps is doing voltage outputs while you sweep the throttle.there may be a presence of a dead spot. When you say missfire will it pop out the intake or exhaust, or do you mean rough running? before you start throwing parts at it take it one sensor at a time.
If you have acsess to scanner i would see what the tps is doing voltage outputs while you sweep the throttle.there may be a presence of a dead spot. When you say missfire will it pop out the intake or exhaust, or do you mean rough running? before you start throwing parts at it take it one sensor at a time.
