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Knocking on cold mornings

Discussion in '4 Cylinder' started by Yotajoe01, Feb 19, 2009.

  1. Feb 19, 2009 at 1:45 PM
    #1
    Yotajoe01

    Yotajoe01 [OP] Member

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    My 01 DC 4cyl prerunner has had a knocking sound for the past four years.:mad: It only happens when its been parked for 12+ hours, and the temperature hits 40 or lower. I've taken it to several toyota dealers and no one can seem to find anything wrong with it. :confused:
    The harder you press the gas the faster and louder the knocking gets. Sometimes it goes away in seconds sometimes minutes.
    The truck still preforms flawlessly but the sound is terrible.
     
  2. Feb 19, 2009 at 2:49 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Some have had this happen in the past. Many thing its "Piston slap", or the pistons not being completely tight angainst the cylynder walls because of the cold temp. From what I have read, there have been no issues of this causeing problems with engine longevity. As long as it goes away when the truck is warm, it shouldnt be an issue.
     
  3. Feb 19, 2009 at 2:51 PM
    #3
    David Tarantino

    David Tarantino Well-Known Member

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    i had the same thing with my 2000 it did go away when it warm up
     
  4. Feb 19, 2009 at 3:17 PM
    #4
    Yotajoe01

    Yotajoe01 [OP] Member

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    The knocking always goes away eventually its just that I DON'T want it to knock at all.:( It gets a little more noticable every year. I can't believe there isn't a solution.
     
  5. Feb 19, 2009 at 3:19 PM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Well, it did it on my 2000 2.7 from 30,000 miles or so, until I sold it with over 100,000 miles. I saw the truck a while back, nothing has been done to it, and its close to 200,000 miles now.
     
  6. Feb 19, 2009 at 6:15 PM
    #6
    sweater914

    sweater914 Well-Known Member

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    You could always pre-heat the engine with an oil pan heater or block heater, not sure if it get rid of the problem entirely but it might mitigate the problem. 40 degrees isn't all that cold either.
     
  7. Feb 19, 2009 at 6:18 PM
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    TRD4x4858

    TRD4x4858 Taco Traitor!

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    Could also be worn timing chain guides
     
  8. Feb 21, 2009 at 10:00 AM
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    Yotajoe01

    Yotajoe01 [OP] Member

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    Ok now that gives me something to work with. Thanks man. I will give it a shot. Maybe thats the problem. Piston slap sounds like it too. How do you correct piston slap?:confused:
     
  9. Feb 21, 2009 at 10:12 AM
    #9
    clemsonfan4573

    clemsonfan4573 New Member

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    I have a 2002 4 cyl tacoma. my truck used to knock when i would first crank it up on cold mornings. i changed the oil to 10W 30 and it hasnt made the knocking noise since
     
  10. Feb 21, 2009 at 11:27 AM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Welcome to Tacoma World!

    Good point. You may want to check a different oil. Mine quieted down a bit when I switched to 10w-30 Mobil 1.
     
  11. Feb 21, 2009 at 11:29 AM
    #11
    Bakemono

    Bakemono Wrath of the runbird

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    Its just piston slap. The reason why the noise goes away after a little while is because once the pistons warm up and exapand, there is no longer enough room for them to bounce and slap around enough for them to make the noise.
    I wouldnt worry about it.
     
  12. Feb 21, 2009 at 11:40 AM
    #12
    TRD4x4858

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    Try some different kind of oil, like 10w30
     
  13. Feb 21, 2009 at 2:49 PM
    #13
    devilsalmostfree

    devilsalmostfree Well-Known Member

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    think maybe a lifter?
     
  14. Feb 21, 2009 at 3:17 PM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    If it wasnt an overhead cam engine, it could be a lifter.
     
  15. Feb 21, 2009 at 8:53 PM
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    Bakemono

    Bakemono Wrath of the runbird

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    Oil has nothing to do with it. If it were a rod knock or a lifter rattle, thicker oil might help, but thicker oil wont do a thing for piston slap.
     
  16. Feb 22, 2009 at 6:51 AM
    #16
    devilsalmostfree

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    yep chris, ur right, i wasnt thinking about that part!
     
  17. Feb 24, 2009 at 10:49 AM
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    Yotajoe01

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    10w 30 huh? all i can do is try. I'll give the mobile 1 a shot. I know its not really doing much damage because its gone on for so long. I just wish I didn't have to see the look on peoples faces when I crank it up and drive off.
     
  18. Feb 24, 2009 at 4:43 PM
    #18
    devilsalmostfree

    devilsalmostfree Well-Known Member

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    could it be ur timing chain slapping the cover?
     
  19. Feb 26, 2009 at 9:42 AM
    #19
    clemsonfan4573

    clemsonfan4573 New Member

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    yea i know that feeling when everybody thinks your truck is messed up ha. i dont really know what causes it to knock like that. ive heard alot of different reasons but when i changed my oil in mine it doesnt knock anymore
     
  20. Feb 26, 2009 at 10:20 AM
    #20
    tacoma-king

    tacoma-king Well-Known Member

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    I live in michigan and there are times when it gets like -20 outside the truck always starts up right away never had a problem with starting in cold weather. It starts better then my dads 1/2 ton chevy hehe. As far as knocking I get it all the time when I first start my truck in the winter its just something it does when it is cold but it goes away in 1 min or less not much you can do about it but it does not hurt anything as long as you let it warm up a bit and give the oil some time to get to the top end
     
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