2004 Chev Impala Cyl 4 missfire - Engine Troubleshooting


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2004 Chev Impala Cyl 4 missfire

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vatman22
New User

Jun 10, 2008, 11:23 PM

Post #1 of 4 (2448 views)

2004 Chev Impala Cyl 4 missfire	Sign In

I have a 2004 3.4L Chev Impala with a #4 Cyl missfire.

I have replaced both the wires, and plugs, and have checked out the coils.

When i pulled the plug outta #4 it was moist with fuel, but did not smell Unburnt.

what could my problem be anyways please..

thanks you

dave284
Enthusiast

Jun 11, 2008, 10:29 AM

Post #2 of 4 (2437 views)

Re: 2004 Chev Impala Cyl 4 missfire	Sign In

When you said checked out the coils, how was this done? It could be the ICM or its contacts, thats the unit under the coil packs.

DanD
Veteran / Moderator
DanD profile image

Jun 11, 2008, 11:59 AM

Post #3 of 4 (2433 views)

Re: 2004 Chev Impala Cyl 4 missfire	Sign In

Keep in mind that the ignition system isn’t the only reason a cylinder will misfire.
Other things that should be checked is the fuel supply and delivery, engine mechanical, induction(vacuum leaks) and then the electronics.
I’m just a guilty as the next person and automatically go to the ignition because probably 75% or better of the time it is the cause. I’ve been bit in the ass a few times, too find low compression in a cylinder or a defective injector.

Just food for thought?

Dan.

Canadian "EH"

vatman22
New User

Jun 11, 2008, 2:20 PM

Post #4 of 4 (2430 views)

Re: 2004 Chev Impala Cyl 4 missfire	Sign In

thanks for the info...

i checked the Ohms on the coils, as you should.. and they all checked out.. then i did a spark test.. and that seemed to check out as well...

i am just thinking that it really can;t be fuel system (except injector), or other electrical, because its ONLY cyl 4....

i did a compression and leakdown check.. and that was ok as well...

I am now begining to wonder if its the injector.... just because the ignition seems to check out for cyl 4.. as does the compression... .. so as far as i know.. the only other thing that will just affect ONE cyl... would be injector...

if i am totally out in left field here... please someone put me strait.. i don;t wanna pull and injector if i am totally missing something...

thanks again

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