In short, my roommate car is misfiring for an unknown reason still, parts have been replaced.... still misfire but very lightly compared to before, engine light is on and blinks when in drive "no change before or after part swap".
Details done as follows.
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01 grand prix gt 3.8
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Roommate asks to look at car.
I hooked my diag computer up. pulls random multi misfire code. - (I'll need to add the code later as I do not have access to vehicle now, house keys n such on his ring are needed)
------------------------------------barred him from driving at this point------------------- He can use my car, for the time being..
Start with basic plugs and wires. - Car was bought used, these looked to be stock from manufacturer.
Start car after install, same error, same stutter in misfire..
So now I take the ignition control module in for testing, fails horribly in a few locations just to be sure...
So now i drop in a new icm plus 3 coils
Misfire is MUCH lighter now but still here... - engine light on still and blinks while driving still
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Can anyone point me in the right direction?
I assume ill need to check fuel line pressure? but seems to be getting gas fine... not hard starting either..
I cant seem to find any vacuum leaks via starting fluid test method.
He had installed a brand new battery prior to problem rising..
I dont want to go replacing everything as I go, but will if needed....
I also tried to look up info and call several places around, most say just drop it off. My roommate doesn't wanna do that because i can fix it myself to cut costs...
Is there some sort of sensor on this engine that I may have missed?
Thank you for your time!
Have a great day!
