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03-19-2011
My '98 Grand Prix GTP sounds like I have a exhaust leak when I start the engine up from cold but the sound goes away within a minute, it lasts longer on cold mornings. The sound seems to be coming from near cylinder #5. I don't see any cracks, gaps, or soot. I'm reluctant to stick my fingers in there while the engine is running. My long term fuel trim is +16.4 at idle, I'm wondering if this has anything to do with it. What's the best way to trouble shoot this?
Jeff
'98 Grand Prix GTP
03-19-2011
+16.4 is vacuum leak.
03-19-2011
Yes, an intake leak would make sense for the +16.4 LT fuel trim. Possibly I have two problems.
04-05-2011
I pulled my heat shield off and I found the problem, the exhaust manifold had cracked all the way around between the #3 and #5 exhaust outlets. It took me about 2 hours to replace working in a parking lot far from my tool storage. Everything was pretty accessible except getting the torque wrench straight to torque the flange bolts.
04-05-2011
glad to hear at least part of it is solved.
Torquing manifold bolts though....
Honestly I've never heard of anyone doing that before.
At least it was a quick job.
04-05-2011
i always just made em nice and tight and went on my way.
you might want to tighten them down again after a few heat cycles to make sure they didnt loosen up.
04-05-2011
yeah when I took mine off for the headers i noticed that most of the bolts to the crossover was already loose. Gave me alot of false knock.
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