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Cylinder 3 misfire...please help!!!

S

swifty

New member
Alright, I know I am asking a question for my first post...but I need help!!!

My Car:
99 GTP with CAI, 3" DP,

The problem:
I shut my car off (the car is always warmed up before it is shut off). I then let the car set for about 30 min to maybe 2 hrs. When I start the car up again, it misfires. If I let the car set for longer periods of time (such as overnight or more than 4 hours) the car starts and runs just fine.

When it misfires it throws the following codes:
P0203-Injector 3 control circuit
P0300-Engine misfire detected

So far, I have replaced the cylinder 3 injector and injector pigtail.

Any thoughts? I thought that maybe my pcm has crapped out. Thanks in advance!!!!
 


Coil was going to be my suggestion also. May be on it's way out. I think I have a couple extra ones around here some where if you need one, just take care of shipping and it's yours.
 
hey guys thanks so much. The plugs are only a few months old. I will have to try new wires and coil pack. Thanks so much again.
 
Alright so this morning the car missed right away when I started it up so I headed over to Autozone to have them test my coils and ICM. Sure enough, one of the coils was bad so I went ahead and replaced the coil and put 2 new wires on...I will put the rest on when it gets a little warmer as -14 windchill is not a lot of fun to work in :(

Anyway, it started and ran fine; however, when I took it out and drove around town for a little while there were 2 periods of time (about a minute probably) where it would misfire again. It was running a lot better than it was before I replace the coil pack and wires. Would this happen because the computer is trying to relearn?
 


yea if the computer was disconected or battery was disconected i could see it running a bit rough at first but that should go away in like 50 miles or so of driving
 
Welp...my car is fixed:) the coil pack fixed it...now i just have to replace one of my idler pulleys, track bar, and blower motor...not sure why all of this stuff just decides to go bad at once:(
 
swifty said:
Welp...my car is fixed:) the coil pack fixed it...now i just have to replace one of my idler pulleys, track bar, and blower motor...not sure why all of this stuff just decides to go bad at once:(
Click to expand...

good to hear. your car is over 10years old and a GM product.
 
Welp...bad news...my car just acted up again after running flawlessly for over two weeks. I came out of the grocery store and the car misfired again when I started it up. I think I am going to have my coils and ICM tested again tomorrow and see if that helps. Any other ideas???
 


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