Trouble code P0304 diagnose

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Terry Neer - 21 Oct 2005 03:00 GMT

I have a Trouble Code P0304 "Cylinder 4 Misfire Detected" on my 1998 S-10
Pickup, 2.2L. The motor will idle real rough and has little power. This
problem is intermittent and I cannot seem to determine what the cause is. I
have replaced both coil packs and spark plugs, but it keeps coming back
periodically. Could this be caused just by a bad plug wire? Fuel injector?
I'm hoping it's not the ignition module. That thing is $200.
Any helpful hints would be greatly appreciated.
Terry

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Jonathan - 21 Oct 2005 03:10 GMT

Greetings,

From what I've seen in the past, a bad plug wire could be your culprit.
Plus it should be relatively cheap and easy to replace.

Cheers - Jonathan

>I have a Trouble Code P0304 "Cylinder 4 Misfire Detected" on my 1998 S-10
>Pickup, 2.2L. The motor will idle real rough and has little power. This
[quoted text clipped - 4 lines]
> Any helpful hints would be greatly appreciated.
> Terry

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Terry Neer - 21 Oct 2005 04:34 GMT

Jonathan,
Thanks for the reply. I agree with you. I'm going the plug wire route first.
I had thought I may have changed the plug wires in the past, but my records
show that I only changed plugs. We'll see if that gets it.
Thanks.
Terry

> Greetings,
>
[quoted text clipped - 11 lines]
>> Any helpful hints would be greatly appreciated.
>> Terry

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Steve Mackie - 21 Oct 2005 13:32 GMT

This might help:

http://users.eastlink.ca/~smackie/p0304.pdf

Steve

> I have a Trouble Code P0304 "Cylinder 4 Misfire Detected" on my 1998 S-10
> Pickup, 2.2L. The motor will idle real rough and has little power. This
[quoted text clipped - 4 lines]
> Any helpful hints would be greatly appreciated.
> Terry

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