Question about 2000 Toyota Corolla

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Engine knock I've noticed the past several weeks that my 2000 Corolla has a pronounced engine knock (sounds like valve knock) on cold starts. Once the engine warms up, the knock is less noticeable, but still there. I bought this vehicle several months ago with about 50K miles on it. It currently has 56K miles and I change the oil/filter myself about every 4K miles and it does not appear to be losing any oil. Also on cold starts, the rpms spike for about 15-20 seconds before the idle slowing starts to back down. Briefly, it sounds like the accelator is stuck and then gradually starts to idle down. Is that normal cold start behaviour (I don't recall it doing this when I bought it) or could the idle air control, etc. need inspection? Thanks.

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  • Gatorsman Sep 09, 2008

    Robert~ Not hardly. I live in central Florida and it's been consistently in the 80's and 90's since around May.

  • Anonymous Oct 09, 2008

    2000 Toyota Corolla.



    The engine knocks at low speeds.



    I thought the engine was loosing oll; which it was. However I just changed the oil & the knocking continues.



    My e-mail address is JMASV@ALLSTATE.COM



    Thanks

  • Roberta Smith
    Roberta Smith May 11, 2010

    i'm not sure the area you live in but is the climate been colder recently ?



    Robert

  • Anonymous Mar 13, 2014

    engine idles too fast on cold start ups and never idles down when engine is warm

  • Anonymous Mar 27, 2014

    engine started making a low pitch roaring noise as it winds down from about 2000 rpm to idle.
    replaced the water pump about a year ago. pretty sure its not that. kinda sounds like it coming from under the valve cover toward the front of the engine. car has 170,000 miles on it.

  • Anonymous Mar 29, 2014

    I've got a 1994 GMC Sierra with 130,000 mies. recently changed the oil and a few days later noticed a knocking sound in engine when driven over 60Mph over a length off time. Usually 15 minutes to work and back everyday on the highway. Will continue to knock at idle once i pull over but only for about five minutes then it returns to normal.

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  • Toyota Master
  • 1,861 Answers

The idle issue is normal. The idle is controlled by the ECU. There are no adjustments for the idle. Regarding the knocking noise, that could be several things, and I am hesitant to comment without hearing it. Take it to a Toyota Dealer & have a tech listen to it. We are very good at identifying noises on the service drive.

Posted on Sep 09, 2008

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