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06-03-2011
Ok IV been stuck trying to find what's causing a misfire with me cylinder 3. Its only at idle and when giving any gas it just goes away. I also found out that when the AC is turned on it goes away again. That makes me think idle air control valve or tsp what do y'all think? Car is a 98 gtp with 148k miles
06-03-2011
If it's always one cylinder, it's not TPS, IAC or sensor related. It'll be plug, plug wire or coil. ....once in a while..ICM, but that's a last resort.
06-03-2011
well now see thats the thing plugs, wires, ICM, coil to that cylinder are all new. And, i swapped injectors around to see if it was that and it stayed in number three. It has a new fuel filter iv run fuel injector cleaner through it we replaced all the vacuum lines and even sea-foamed the car. The only thing that stops me from thinking it is mechanical is teh fact that it goes away when the ac is on or when i hit the gas. What else could it be?
06-03-2011
Swap plugs between 3 and 5, see if the misfire moves. maybe a cracked plug.
New parts can be bad. If none of this cures it..I'll send you under the valve cover.
06-03-2011
ill do that today will be sitting at home most of the day anyway but...just cuz it wasnt too expensive i got a IAC just to be sure didnt seem to change but dont i have to unplug the battery for 10 mins? cuz i herd with a new iac the computer has to relearn the idle is this correct?
06-03-2011
I've never relearned one...Not sure...unplug it anyway. But for 30 min.
06-03-2011
do a cranking psi test on the suspected cylinder, and compare with all other cyliders.
06-03-2011
one thing that hasn't been mentioned is that the PCM can also cause misfires. Probably not in your case though.
06-03-2011
yeah one guy said that could be a possibility only way to tell though is get my hands on a completly stock PCM or find a buddy with a gtp or something.
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