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1998 Audi A4 Quattro Engine Noise

When the car idles, it sounds like a diesel engine. I have had it in the shop (Audi specialists) five times since April 2007. The first time, I was told that it was two screws loose on the cam. It was okay for a bit then the noise started again. They replaced the auxiliary cooling fan. Temporarily okay. Then it started again. They replaced the water pump which had been replaced 15,000 prior. The next time they replaced the serpentine belt. This is the fourth belt on a car that had approximately 115,000 miles on it. Then they added Lucas Stabilizer Oil. Quiet for about a week. Then the noise was back again. I was told they don't know what the problem is.

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  • patcam07 Jun 25, 2009

    I always use Premium gas, so other than that, I will have to take the car back to the shop and have them check out the other possible problems.

    Thank you



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The timing is too far advanced at the time of the noise, the "diesel knock" is detonation

or this could be from using fuel with a low octane rating, try premium or octane booster.

or may have carbon build up in the conbustion chamber causing fuel to ingnite while entering cylinder

Posted on Jun 24, 2009

  • gerald darling
    gerald darling Jun 26, 2009

    the 2 loose screws on the cam can affect the timing

  • gerald darling
    gerald darling Jun 26, 2009

    your car may fall under a lemon law if they can't fix it by the third try



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