Mechanics

WHY IS MY CAR MAKING KNOCKING / RATTLING NOISES?

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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Lenka03
October 2, 2012.



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.

KHLow2008
Oct 2, 2012.
It's coming from the drivers side. No it's not affected by the a/c.

Tiny
Lenka03
Oct 2, 2012.
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?

KHLow2008
Oct 2, 2012.
Thank you. It's a 4 cylinder 1.7L

Tiny
Lenka03
Oct 2, 2012.
That should be right because if it is a 2.0, the engine is at opposite end of vehicle.

KHLow2008
Oct 3, 2012.