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Random Misfire, exhaust leak causing it? 2004 2500 HD 6.0

Random Misfire, exhaust leak causing it? 2004 2500 HD 6.0

Postby pete44131 [OP] » Oct 07 2012, 7:11pm

I have a 2004 Silveardo, 6.0, 2500 HD.

Been dealing with a random misfire code for the longest time. Comes and goes, but mostly comes. I've run plenty of injector cleaner through it, inspected intake thoroughly, replaced cam position sensor, etc. I have noticed an exhaust tick but never could quite pin it down (never really did an exhaustive search either I guess) but recently noticed that the rear bolt on the exhaust manifold is missing, passenger side. Seems like the head snapped off so I will have to extract the remaining section of bolt from the block.

I am wondering if this exhaust leak could cause the random misfire code. It normally seems to happen at freeway speeds but I have never noticed any amount of performance change. truck runs great. Just gets the code/CEL..... Sometimes it flashes, other times solid. Another thing I have noticed is that it often seems to occur when I am off the gas on the freeway and not when I am accelerating.

At any rate, wondering if the exhaust manifold leak can be a culprit.

Thanks to everyone in advance. Pete
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Re: Random Misfire, exhaust leak causing it? 2004 2500 HD 6.

Postby starspangled6.0starspangled6.0 is online! » Oct 08 2012, 12:55am

When you replaced the camshaft position sensor, did you have it re-learned? I had a similar issue to yours (which apparently is also a common problem with this engine), and having the sensor re-learned fixed it.
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Re: Random Misfire, exhaust leak causing it? 2004 2500 HD 6.

Postby pete44131 [OP] » Oct 08 2012, 1:03am

I have not had it relearned. I was having this issue prior to replacing the cam sensor as well. Hard/long starting prompted me to change the cam sensor.

Is there a way to do the re-learn procedure myself or is this a dealer only service?
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Re: Random Misfire, exhaust leak causing it? 2004 2500 HD 6.

Postby starspangled6.0starspangled6.0 is online! » Oct 08 2012, 1:07am

It's a dealer-only fix, or anyone with one of those really expensive scan tools. My local favorite shop charged me $25 for a quick 10 minute re-learn. Try it- it's worth it; but be prepared to have to call around to find a shop that will do it. Most of them just told me I was barking up the wrong tree.
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Re: Random Misfire, exhaust leak causing it? 2004 2500 HD 6.

Postby pete44131 [OP] » Oct 08 2012, 1:12am

Thanks, Jon... I will definitely look into it. I might want to fix the exhaust leak first, just to be safe.
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Re: Random Misfire, exhaust leak causing it? 2004 2500 HD 6.

Postby vic401 » Oct 13 2012, 2:30pm

i have the same year and model and also have a manifold leak the re learn worked great for mine even with the exhaust leak, dont let the mechanic try to talk you out of the re learn it will work, mine also had the same symptoms after the relearn i never saw the light agian
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