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2011 2.7l occasional backfire on startup??

Discussion in '4 Cylinder' started by TacomaBuzz, May 15, 2011.

  1. May 16, 2011 at 3:49 PM
    #21
    Juggernaut

    Juggernaut Captain

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    I get it too, also only on cold starts when it is cool outside, usually in the morning, almost never in the afternoon though. Truck is stock, still has the secondary air filter.
     
  2. May 16, 2011 at 4:05 PM
    #22
    Tacoyota

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    my 2ndary is removed. You could be onto something,
     
  3. May 16, 2011 at 4:16 PM
    #23
    Black08Taco

    Black08Taco Well-Known Member

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    I have an 08. I used to get the pop on cooler mornings after sitting for a wile. I think it is unburt fuel in the cat. I let mine sit and idle for a few seconds before shutting it off. Hasen't done it in 20k miles ever since. it fixed it for me.

    I also have a K&N cold air intake. Did it before and after that was installed...
     
  4. May 17, 2011 at 12:49 AM
    #24
    Kelson

    Kelson My Truck is Cuter than Yours

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    when my truck was completley stock, it backfired on startup. when i took out the stock filter, it still backfired. and when i took out the secondary filter, it backfired on startup. and then i put a new muffler on, and it backfires even louder now :D

    most of the people i know with the 2TRs have this problem. seems normal i guess.
     
  5. May 17, 2011 at 7:42 AM
    #25
    911-3.2

    911-3.2 Well-Known Member

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    Mine does it sometimes as well. I could be wrong, but it seems to happen if I shut the truck down immediately upon parking vs waiting a few seconds for it to idle down. Especially if I had just had to rev it a bit to inch into a spot. Either way I doubt it is anything to worry about. Just seems like a bit of leftover fuel burning off.
     
  6. May 28, 2011 at 7:49 PM
    #26
    08pretaco

    08pretaco Almost there

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    Mine only does it when its been sitting out in the cold and on a slant that makes the nose of the truck lower than the rear
     
  7. May 28, 2011 at 7:52 PM
    #27
    joes06tacoma

    joes06tacoma Well-Known Member

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    We've got two 09 2.7s at work. I drive one of them. It always runs perfect, but has the noise you describe as well. I've heard the other one start up and make the same sound. Both trucks have almost 50K on them with no drama. Just the nature of the beast I think. Sounds like crap but doesn't seem to be hurting anything.
     
  8. May 29, 2011 at 7:08 PM
    #28
    Silvert

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    I have a Tacoma 4 cylinder with 10,000 miles on it and it sometimes gives a very light pop on start up. It may seem to occur when it does not start immediately.
    Has anyone spoken to the dealer
     
  9. May 29, 2011 at 7:52 PM
    #29
    frog13

    frog13 Well-Known Member

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    I had a dual sport bike that would do similiar things....until I rejetted to a richer mix.....all vehicles come from the factory as lean as they can make them(run)...EPA emission standards.
     
  10. Jun 1, 2011 at 2:18 PM
    #30
    DGXR

    DGXR Well-Known Member

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    No backfire or other popping sound on cold start here.
     
  11. Jun 2, 2011 at 9:43 PM
    #31
    stunt man hans

    stunt man hans displaced viking living in New Hampshire

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    same here my reg cab has about 8,000 miles and it does it sometimes. although its not very common nor something i believe i could reproduce for the dealer to check out or even for me to video.
     
  12. Jun 2, 2011 at 9:44 PM
    #32
    stunt man hans

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    i actually thought it was due to the muffler i had installed i have a flowmaster 40 and i know i lost a significant amount of back pressure doing so.
     
  13. Jun 30, 2012 at 10:16 PM
    #33
    gofas

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    just bought the 2009 truck with 24k. So far I enjoy running around in it.

    The backfire occurs on some cold starts and some afternoons as well leaving work.
    I'm gonna try the idle for a few seconds before cutting the ignition off after pulling into work and see if it helps.
     
  14. Jul 1, 2012 at 5:12 PM
    #34
    AndrewFalk

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    I've never noticed mine doing this. I removed my secondary filter 30k miles ago and I always let the truck idle for about 10 seconds before shutting it down.
     
  15. Jul 1, 2012 at 7:34 PM
    #35
    cbass8u

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    I've got a 2010 with about 25k on it. Mine does it all the time, and I haven't had any issues with it. It actually sounds kinda badass.
     
  16. Jul 2, 2012 at 5:01 PM
    #36
    91r100gs

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  17. Jul 2, 2012 at 5:04 PM
    #37
    MightyMouse-SCT

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  18. May 27, 2013 at 6:24 PM
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    Skunkman

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    Mine does it also, and has the secondary air filter removed. It only does it when the day I park it is warm ( for here ) 70's-80 maybe, and it goes down into the low 30's at night,it will make some type of backfire at the exact time it fires up that morning. It never does it a second time either. I alway's blamed it on some part of the cold start enricher trying to compensate for the 50 degree temp. change from when I parked it till when I started it again. Also we just put new Denso's in it, and I don't remember it ever doing this with the original plugs,but my memory ain't all that good either.
     
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