Smoking under the hood and got extremely loud?

1991 CHEVROLET LUMINA

270,000 MILES • 2WD • AUTOMATIC

KIMMY429

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My car keeps smoking from under the hood, it looks like it's coming from somewhere behind my motor. my car got extremely loud running all at once this morning. I have checked the fluids multiple times and they are all full. I can't seem to find a leak that would be causing the smoke or any other issue. I am not a certified mechanic but do know my way around the car any advice on other things I can check would be greatly appreciated.

Apr 27, 2023 at 8:40 AM

JACOBANDNICKOLAS

CERTIFIED EXPERT
110,175 POSTS

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.

Image (Click to enlarge)

Apr 27, 2023 at 7:05 PM