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Rattling noise under the hood

Tiny
CARISSAD232
  • MEMBER
  • 2002 HONDA CIVIC
  • MANUAL
  • 104,000 MILES
My car makes a rattling noise under the hood when the car is in motion. I can be pressing the gas and it makes the noise, or coasting in neutral and it makes the noise. Sometimes it is very* loud, and sometimes unnoticeable. The noise stops when I am idle at a light or parked. Unfortunately since I can't pinpoint the source under the hood (when idle), I have to guess that it is coming from the under the hood in the center, but slightly skewed to the right. Any ideas?
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Wednesday, January 19th, 2011 AT 2:35 PM

1 Reply

Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
Typically these noises are exhaust related. If you cannot find any loose exhaust heat shields or worn components, I would check to see if the alternator is buzzing around. The alternator mounting bolts sometimes become loose over-time. Under extreme circumstances, you will have to replace the alternator bracket if the threads are badly worn.
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Thursday, January 20th, 2011 AT 12:10 AM

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