Question about 2001 Toyota 4Runner

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Knocking until car warms up

I have a 2000 4Runner that has developed a knock when I first start the engine. It goes away after the car warms up....any ideas of what is causing that?

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  • laraldo Jan 15, 2009

    Hey tomjilwolf, did either of the answers to your question solve your problem? I have the same problem with my 2000 4Runner and it's gotten worse since the weather got colder. Once the engine warms up there is no problem at all, no ticking, knocking pinging or anything. However when it's cold I can hear a knocking that seems louder on the passenger side than it is on the driver's side. I hope we get an answer!

  • kccoln Feb 13, 2009

    Im having the same problem with a 95 5.2 liter dodge.It sounds like it is coming from under the intake manifold.Same symptons,a knock not a tapping.louder on passenger side.Goes away when truck at normal operating temp.It didnt do it until I changed oil.Im confused?Is it a lifter or something more serious.?

  • David Johnson
    David Johnson May 11, 2010

    I would be glad to help you, but I need more info, does the knock sound hollow and slower than engine rpms or more solid and faster? I can think of a couple of things off the top of my head, 1 hydraulic lifter leaking down, dirty oil or a sticking valve would be my first guesses. Sticking valve should show up on a compression test while engine is cold also, possibly a leaking hydraulic lifter, hope this helps you and Merry CHRISTmas!

  • Anonymous Mar 29, 2014

    knocking goes away after it warms up

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Sounds like a lifter noise. worn lifters can't keep oil in them anymore so over night the oil leaks out. when you start the vehicle, you will hear a ticking noise or knocking noise till the lifters fill with oil again. only remedy is to replace the lifters.
you could try an additive but it's temporary.

Posted on Dec 24, 2008

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