Question about Buick Regal

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I have a 1990 buick regal 3800 V-6 when engine idles it makes a rattling noise but goes away when i rev engine up (2000rpm) I replaced alternater and water pump but noise still there. Pls help?

Posted by gpansino on

  • gpansino Aug 30, 2009

    Thank you I will have someone check the harmonic balancer. Could the noise be the timing chain?

  • william moody May 11, 2010

    make sure it is not the catalytic convertor causing it. could also be the harmonic balancer these are notorius for coming apart it has a rubber liner in that breaks take a look at this.

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Explain rattling noise. you can take off the fan belts. start engine briefly to see if engine stil makes noise. that will tell you if its engine or the acc.

Posted on Aug 30, 2009

  • Anonymous Aug 30, 2009

    MAYBE BUT THE ENGINE HAS STEEL GEARS WITH NYLON TEETH TO KEEP IT QUIET. IT WOULDNT MAKE THAT KIND OF NOISE THAT YOU DESCRIBE.

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