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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

92 Pontiac Bonneville, Rumbling/growling noise when wet
Q: I have a ‘92 Pontiac Bonneville. When driving in rainy weather, if I run through any water, the vehicle begins to make a terrible noise. You can feel it vibrate under your feet. I thought this was the brake pads somehow vibrating because they got wet, however the noise does not stop or change when the brakes are applied. The pitch (if you will) will change when you place the transmission in neutral and rev the engine. The car continues to run just fine, and eventually the noise disappears. I have thought that water may be splashing up between the converter and the heat shield and is percolating, but that would not change with engine speed. I am at a loss. Any ideas?

A: The forward exhaust on many vehicles is a dual walled pipe, one pipe inside another. This pipe runs pretty hot and the sudden cooling by water will cause the outer pipe to shrink more rapidly than the inner piper. Yup, that would make for some strange noises.

 

 
     
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