Misfire diagnosis part 2

[Ted]

Ok guys I've determined a lot of things in trying to diagnose my misfire. A run down on the problem again is as follows.

My car is misfiring on random cylinders mostly from 1500-2500 rpms under load. It perfroms well at lower speeds and if it is in higher rpms like around 3000. There is a small amount of misfire if I rev it up completely but barely any.

Now, this is what i'm figured out.

1. I don't think it's a fuel related problem (pump, filter, injectors) there seems to be no loss of fuel and it doesn't have a hard start of seem to be running lean.

2. It can't be just a plug or a wire because it is misfiring on random cylinders. I'm pulling the code P0300 (Engine Misfire Detected).

3. I replaced all 3 coil packs and still nothing.

Now, i have a few theorys...

I think it has to be the crank shaft position sensor or the ICM. Those are the 2 components that control the coil packs. But the crank shaft seems like a hard install to just throw a part at it and see if it works. I can test the ICM. But I'm wondering what you guys think about the situation.

Thanks, Ted

[Ted]

thanks agian guys? really, i'd like to thank you for all the help you guys have been providing

[96_Fbird]

check your intake manifold doesnt sound liek it buy i would check it otherwise maybe the pcm

[toast]

<blockquote>quote:</font><hr>Originally posted by Ted:
thanks agian guys? really, i'd like to thank you for all the help you guys have been providing<hr></blockquote>


[img]graemlins/rofl.gif[/img] I will check it out sat man.