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4.0L Tacoma Running Very Rich

Discussion in '2nd Gen. Tacomas (2005-2015)' started by elroy462, Sep 11, 2008.

  1. Sep 11, 2008 at 6:22 AM
    #1
    elroy462

    elroy462 [OP] New Member

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    Pennsylvania
    Vehicle:
    2007 Tacoma 4.0L Acess Cab TRD
    K&N Cold Air Intake
    Is there anyone else out there that is experiencing an unusual amount of carbon build-up on the exhaust tip? I don't use "garbage" gasoline and take very good care of my vehicles also, I never experienced this with my 2004 Tacoma w/ the 3.4L engine. Please advise..........:confused:
     
  2. Sep 11, 2008 at 6:45 AM
    #2
    lsocoee

    lsocoee My hair is all natural Moderator

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    Hotdog
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    Wet Okole Underwear
    First off, welcome to the site.

    if I go easy on the gas for a couple weeks and then I floor it, I generally get a puff of carbon. I normally go for premium at Shell.

    If you have any pics, that would help.
     
  3. Sep 11, 2008 at 6:46 AM
    #3
    Cavender76

    Cavender76 Well-Known Member

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    Clint Cavender
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    Tool Box, 2nd Filter Removed Drop In K&N
    Mine has done it since the begining. Look at all Tacomas you see and youll notice we are not alone.
     
  4. Sep 11, 2008 at 7:15 AM
    #4
    Caddmannq

    Caddmannq MotoNerd

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    Yeah, they do run a bit rich sometimes IMO. It might help to clean your throttle plates and run some injector cleaner if it gets bad.

    Remember that even though the Tacoma is certified as a low emission vehicle, they don't test it under every condition. Like the conditions where being too lean would make them blow up.

    AFAIK, they don't test them WFO, or under extended hard duty, pulling stumps, hopping rocks, or hauling the boat. They use a standardized driving cycle that represents the average suburban soccer mom on her daily trek to the mall and back.

    What the truck does outside of that specific driving cycle is pretty much up to Toyota.
     
  5. Sep 11, 2008 at 7:39 AM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    Its normal.
     
  6. Sep 11, 2008 at 4:11 PM
    #6
    Janster

    Janster Old & Forgetful

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    It's normal....

    Nothing wrong with running rich. The engine runs cooler that way versus lean/hot.
     
  7. Sep 11, 2008 at 9:46 PM
    #7
    TacoTurd

    TacoTurd Defying Alliances since 2007

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    Central Texas
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    TRD Exhaust, TRD CAI, Bull Bar, PIAA lights, Passport, Bed Mat, UWS Toolbox, Hood Struts, Rear TSB, TRD/Okole Seat Covers, Hellwig Rear Sway Bar, Burned Carpet, Nasty Dent in Roof
    Normal.

    Just your exhaust is turning black? Hell, my whole quarter panel gets covered with soot.
     
  8. Sep 11, 2008 at 9:51 PM
    #8
    Casey05Taco

    Casey05Taco Well-Known Member

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    Welcome to TW
     
  9. Sep 11, 2008 at 9:54 PM
    #9
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    run some techron thru the tank, and maybe clean the throttle body. other than that, ts pretty normal for the 4.0. you can also get a slip on/bolt over exhaust tip if the soot is getting on the fender at all. just a heads up.

    by the way....welcome to tw!!:)
     
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