Mechanics

WHAT COULD THE RATTLING NOISE COMING FROM UNDER MY CAR BE FROM?

1999 Chevrolet Blazer • 140,000 miles

I have a 1999 Chevy Blazer that has a loud rattling sound coming from underneath the vehicle when I start it up and when it idles. It seems to make less noise when I am in motion. Any ideas?


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Kankersmit
June 11, 2012.



Possibly the cat broke loose and is rattling. You need to get under it and start smacking things around to try to duplicate the noise. Also possibly a heat shield came loose.

Saturntech9
Jun 11, 2012.