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Slight clacking noise when getting on it..

Discussion in '4 Cylinder' started by oldblue1968chevy, Feb 3, 2013.

  1. Feb 3, 2013 at 9:25 PM
    #1
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    Noticed a clacking noise when the trucks cold in the morning when i get on it, only seems to happen when its cold. I noticed it warm few days ago, not very loud and cant mimick it when im in N or P. 2.7 auto 138K.

    Thanks..
     
  2. Feb 5, 2013 at 8:47 AM
    #2
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    Anyone? Im pretty sure it only does it when the engines cold. Cant really pinpoint where it comes from.
     
  3. Feb 5, 2013 at 8:55 AM
    #3
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    Sam I am, green eggs and ham
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    Any engine is going to make some noises when cold.

    If it's doing it under acceleration at full temp, it's more than likely a leaky manifold. Mine did it for years, I replaced the manifold and it's coming back again a year later.

    Not going to hurt anything.
     
  4. Feb 5, 2013 at 10:19 AM
    #4
    DGXR

    DGXR Well-Known Member

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    aFe Pro Dry air filter, magnetic oil drain plug, synthetic seat covers, steering wheel cover
    My 2006 2.7L has 86K miles and does the same thing. On cold start, if it's under 35*F, it has a light knock after the engine spools down. If I give it some gas, the knock gets a little louder so I just be careful to give it very light throttle until the knock goes away. The knock goes away very quickly, about 2 minutes after initial cold start. It's a little irritating but it only happens on the coldest mornings (CA) and it goes away quickly, plus I haven't had any problems with driveability or fuel economy or oil consumption. Runs fine.

    I did a couple searches on "engine knock" and "cold knock." These links may or may not be helpful to you:

    http://www.tacomaworld.com/forum/1st-gen-tacomas/258941-knock-bottom-end-2-7-a.html

    http://www.tacomaworld.com/forum/4-cylinder/244968-2-7l-cold-start-rattle.html

    http://www.tacomaworld.com/forum/2nd-gen-tacomas/248970-engine-knocking-cold-start.html
     
  5. Feb 5, 2013 at 1:30 PM
    #5
    VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    He has the older 2.7, not the engine you have.

    From what I understand both the newer 4 and 6 cylinder Tacoma's have lifter tap when cold.
     
  6. Feb 6, 2013 at 7:39 AM
    #6
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    Only does it in D (flipped it into N today while driving) starts to become noticable after about 1500rpm. Also, is it normal to idle at 1500ish RPM (25*)?

    Thanks
     
  7. Feb 14, 2013 at 6:12 AM
    #7
    JeffRock

    JeffRock Well-Known Member

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    My 09" has a knock when its under 25°F out.
     
  8. Feb 14, 2013 at 2:46 PM
    #8
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    This one only does it in D sounds great when in N

    Anyone?..
     
  9. Feb 15, 2013 at 8:29 AM
    #9
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    I almost believe its something transmission related...sounds great in N (when revved) havent tried going real fast in R when cold :) or the lower gears..
     
  10. Feb 15, 2013 at 9:22 AM
    #10
    angtrevjack

    angtrevjack New Member

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    i have a 1996 2.7 5 speed had loud clicking noise on top of engine., so we put new lifters in and went ahead an put timing kit on.. that didnt help. engine has 174000 miles. with brk on and in gear if you load engine sound will stop at certain rpms. any ideals what that might be?????
     
  11. Feb 15, 2013 at 10:18 AM
    #11
    pigger

    pigger Well-Known Member

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    My '04 2.7 makes a noise that might be similar... haven't figured it out yet. I'm hoping it's not a timing chain issue. My 2.7 has mechanical lifters, so it's not the lifters failing to pump up properly. Only does it cold, and only for a little while. I use Mobil 1 5w-30. It's not a very happy-sounding sound. :(
     
  12. Feb 16, 2013 at 10:08 AM
    #12
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    Im dont think mines engine related..just transmission related when the fluid is cold..think im going to get new fluid and filter and go from there.
     
  13. Feb 20, 2013 at 11:29 AM
    #13
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    Since it only does it in D I changed the trans fluid (drained/refilled) Still doing it :( I have no earthly idea.

    I dont think it could be timing (pinging) because if I rev it in N it sounds good.
     
  14. Mar 11, 2013 at 10:14 AM
    #14
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    Bump, Like said above, it ONLY does it in DRIVE when freshly started...

    Im stumped.
     
  15. Mar 29, 2013 at 10:45 PM
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    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    Maybe it could be an exhaust manifold cracked? Seems popular on this year truck. Heat shield rattles so I may take it off and have a look.

    Dont understand why it could leak ONLY in gear and not in N or P (Noise only happens when its cold or been sitting more than 1 hour @ 45* temps)

    Ideas?..
     
  16. Apr 8, 2013 at 6:23 PM
    #16
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    Confirmed cracked manifold :( Trying to decide which route I want to take. I *THINK* this is recently happened but IDK for sure. You guys think the valves are OK?

    Thanks I'll update again when the noise is gone to confirm a fix for others like me desperately searching the net lol
     
  17. Apr 17, 2013 at 8:44 PM
    #17
    oldblue1968chevy

    oldblue1968chevy [OP] Well-Known Member

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    confirmed it was an exhaust leak all fixed :)
     
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