Hi,
When you say it got loud, do you mean it now sounds like an exhaust issue? As far as behind the motor, there is a lot there. Have you checked on or around the exhaust in the rear?
Let me know which engine is in the vehicle. There were two different V6 engines and a 4-cylinder used. I need to know which you have. (See pic below)
Also, if it is a V6, check around the intake for coolant leaks. Also, there is a plastic quick connect in the rear that may be leaking onto the exhaust.
If you could, record it running and upload it for me to hear. Also, if you can, I would scan for diagnostic codes. Here is a link that explains how it's done. All you need is a short jumper wire or even a paper clip.
https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method
Let me know.
Joe
See pic below.
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Thursday, April 27th, 2023 AT 7:05 PM