WHY IS MY CAR MAKING KNOCKING / RATTLING NOISES?

  • Tiny
  • Lenka03
  • 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?

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Tuesday, October 2nd, 2012 AT 4:15 PM

5 Replies

  • Tiny
  • KHLow2008
  • Expert
  • 41,997 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

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
  • Expert
  • 41,997 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

Thank you. It's a 4 cylinder 1.7L

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Tuesday, October 2nd, 2012 AT 11:54 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,997 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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