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Knocking when cold...

Discussion in '1st Gen. Tacomas (1995-2004)' started by Firefighter160, Nov 8, 2009.

  1. Nov 8, 2009 at 3:22 PM
    #1
    Firefighter160

    Firefighter160 [OP] Well-Known Member

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    We had our first below freezing night here in Virginia the night before last. I go out and start my truck in the morning and let it sit about a minute before I take off, well when I rev up a little to go I hear a loud knocking and quickly let off. When its at idle its quiet but when I revved it up it knocked until it warmed up a little more. Is this normal and will it hurt any thing. Its a 2004 2.7 with 130k on it.
     
  2. Nov 8, 2009 at 3:41 PM
    #2
    ChrisYoTaCoMa

    ChrisYoTaCoMa Chrome's for Harleys and old farts

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    My SAAB 900 did that too when it was freezing out, but it only did it for a minute then went away. I went from 10W30 to 5W30 and it stopped. I also had 244K on that car. My tacoma did it I think once last winter, changed my oil the next day, and it never did it again. Are you using 5w30? I also have the 2.7.
     
  3. Nov 8, 2009 at 3:42 PM
    #3
    Firefighter160

    Firefighter160 [OP] Well-Known Member

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    Yea just changed the oil a week ago, 5w-30 for the winter....
     
  4. Nov 8, 2009 at 3:44 PM
    #4
    ChrisYoTaCoMa

    ChrisYoTaCoMa Chrome's for Harleys and old farts

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    Was it a tapping, like a lifter? or a knocking like a deeper sound?
     
  5. Nov 8, 2009 at 3:50 PM
    #5
    Firefighter160

    Firefighter160 [OP] Well-Known Member

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    It was a knock, defintely not just a valve train tap.
     
  6. Nov 8, 2009 at 3:52 PM
    #6
    ChrisYoTaCoMa

    ChrisYoTaCoMa Chrome's for Harleys and old farts

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    Have you had your oil pressure checked? How many miles?
     
  7. Nov 8, 2009 at 3:56 PM
    #7
    Firefighter160

    Firefighter160 [OP] Well-Known Member

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    Never checked the oil pressure it has 135k miles on it, never really heard of a tacoma oil pump gone bad, especially one thats only 5 years old.
     
  8. Nov 8, 2009 at 3:57 PM
    #8
    ChrisYoTaCoMa

    ChrisYoTaCoMa Chrome's for Harleys and old farts

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    Neither have I... But hell, you never know? Something isn't right. Mine was just a sticky lifter.
     
  9. Nov 8, 2009 at 4:14 PM
    #9
    Firefighter160

    Firefighter160 [OP] Well-Known Member

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    Yea Im hopin its something like thick oil or somethin...
     
  10. Nov 8, 2009 at 4:36 PM
    #10
    ChrisYoTaCoMa

    ChrisYoTaCoMa Chrome's for Harleys and old farts

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    They make this stuff you can put in your oil, "Marvel mystery Oil" that is what I put in my SAAB, and it never did it again.
     
  11. Nov 9, 2009 at 1:50 PM
    #11
    jayheath2002

    jayheath2002 Active Member

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    I have the exact same issue with my 01 Taco 2.7 liter. It did it the last 2 winters, and it’s doing it again. Only at a certain temperature and only for that moment. Once its warmed up for the day it doesn't do it anymore. For me, oil changes have made no difference. One mechanic mentioned piston slap. I was told this could go on 100,000+ miles. I try to warm my truck before driving. It only has to run 1 or 2 minutes to prevent it.
     
  12. Nov 9, 2009 at 2:01 PM
    #12
    jab08

    jab08 Well-Known Member

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    I'll add to the club!! Mine does the same thing, scared the crap out of me the first time I heard it, I thought me poor baby was going to give up on me. I only have 90k on mine and its been doing this for 2 winters now. Only on real cold mornings. Start it up and it knocks, deff. not a light knock but not like beating with a sledge hammer either, lasts for about 15-20 seconds and goes away when warmed up. I have no idea what it is but I wish it would stop.
     
  13. Nov 9, 2009 at 4:22 PM
    #13
    scriber007

    scriber007 Well-Known Member

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    My was also doing the same thing. Weird noise coming from the engine. I sprayed some WD40 around the drive belts, seemed to quiet it down a bit now.
     
  14. Nov 9, 2009 at 7:58 PM
    #14
    wildjerseyfirefighter

    wildjerseyfirefighter I sell fishing and fishing accessories

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    what kinda oil filters ya using? Wonder if the oil is draining back into the pan, and getting thick when its cold, preventing the oil from getting into the motor right away, thus the knock?
     
  15. Nov 9, 2009 at 8:17 PM
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    BeefTaco

    BeefTaco WESTern Alliance: NORCAL COAST

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    Yep WJF i was thinking the same thing i only use OEM Toyota with the check valve.
     
  16. Nov 9, 2009 at 8:51 PM
    #16
    Firefighter160

    Firefighter160 [OP] Well-Known Member

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    Well I dont think the oil filter needs a check valve on the 2.7 because it sits straight up. The oil filters with check valves are the ones that mount sideways or so on the motor and need a valve to keep the oil in the filter. The oil filter on the 2.7 wont drain out because it sits straight up and down and act like a cup for the oil to stay in. Im thinkin my problem may be piston slap. I plan on runnin her until she quits.
     
  17. Nov 29, 2009 at 3:37 PM
    #17
    pooj10

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    My 2002 2.7L Tacoma does the exact same thing when it's cold and there are only 73K miles on the engine. I have emailed Toyota and they claim to know nothing about this. Kind of funny that this forum is full of 2.7L engine noise when cold and they know absolutely nothing. Engines may run for quite sometime time with this condition, but should not be acceptable to any owner what so ever!!
     
  18. Nov 29, 2009 at 4:02 PM
    #18
    Firefighter160

    Firefighter160 [OP] Well-Known Member

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    Yea it is definetly a problem. I think everyone that has this problem should notify Toyota and who knows we may get a service bulletin...
     
  19. Nov 30, 2009 at 2:12 PM
    #19
    Firefighter160

    Firefighter160 [OP] Well-Known Member

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    Piston slap is a possibility but the way mine knocks doesn't sound like piston slap. I had a 2000 chevy z71 with the 5.3 and it had the common piston slap problem, the piston slap is a fast paced rattle like knock. The cold knock in my Tacoma is more of a slow, deep lower end knock.
     
  20. Nov 30, 2009 at 2:15 PM
    #20
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    My truck also does this. It is not loud at all though it goes away after about 20 or 30 seconds when its really cold out. . .
     
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