Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello, I'm Chris. Thanks for seeking us for help.
I am sorry for the delay in getting a response to you. Sometimes we get alot of customers and just can not keep up. Sometimes you just have to wait for the correct tech to login.
Do you even still need help. Sometimes customers seek help elsewhere or figure it out on their own before we get to each and everyone.
I am sure I can help a lot or a little at least something if you give me a chance and work with me. I am going to get an answer to you regardless if you reply or not sooner or later.
If your concern is urgent reply and let me know and if you have anything more you think will help me, to help you, let me know. I work on here normally 3pm-3am central.
Is it loud from the exhaust or the engine?
Is the idle to high or remain high on startup?
How long does it last?
I suspect a broken baffle in the exhaust that swells once warmed up and decreases the noise level.
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Thanks for the update. Can you check for black soot around the exhaust manifolds bolts, studs, mating surfaces, welds to see if there is a leak.
All around the exhaust manifold where they are attached to the heads. Open the file below for an image.