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Why is my car making knocking / rattling noises?

Tiny
LENKA03
  • MEMBER
  • 2004 HONDA CIVIC
  • 90,000 MILES
Hello. My car started making strange noises from under the hood. Its not constant and also stops when I accelerate. The noise sounds like a rattle/knocking sound. Sometimes there is a bit of vibration. What could be wrong?
Tuesday, October 2nd, 2012 AT 4:15 PM

5 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
You need to locate the source of the noise and let us know where it is coming from.
If the noise changes or is affected by turn A/C on and off, that is usually caused by the serpentine belt and its tensioner.
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Tuesday, October 2nd, 2012 AT 4:24 PM
Tiny
LENKA03
  • MEMBER
  • 3 POSTS
It's coming from the drivers side. No it's not affected by the a/c.
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Tuesday, October 2nd, 2012 AT 4:41 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
That is most likely belt related components. You need a visual inspection to locate the source of the noise. Could be a bad crank pulley, idler bearings or the alternator.

Btw which engine do you have?
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Tuesday, October 2nd, 2012 AT 4:56 PM
Tiny
LENKA03
  • MEMBER
  • 3 POSTS
Thank you. It's a 4 cylinder 1.7L
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Tuesday, October 2nd, 2012 AT 11:54 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
That should be right because if it is a 2.0, the engine is at opposite end of vehicle.
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Wednesday, October 3rd, 2012 AT 1:28 AM

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