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Rough Idle and Misfiring #4 cylinder

Discussion in '1st Gen. Tacomas (1995-2004)' started by nizzledizzle, Jan 26, 2009.

  1. Jan 26, 2009 at 2:12 PM
    #1
    nizzledizzle

    nizzledizzle [OP] Member

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    Nothing impressive. Bumber guard and clear corner lights
    The last few weeks my truck has been idling rough. The check engine light came on signaling an o2 sensor problem, however diagnostics show that the #4 cylinder is misfiring at an idle and DOES NOT misfire while under load. Any suggestions? Could an bad 02 sensor cause a misfire?

    Have already changed plugs/wires/coils and fuel filter to no avail...

    Any help would be great!
     
  2. Jan 26, 2009 at 2:19 PM
    #2
    bobwilson1977

    bobwilson1977 Well-Known Member

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    none except for crappy hub caps and floor mats.
    Could be a faulty TPS ( Throttle position sensor) or a dirty throttle body. I had a similar problem. Also- did you use GOOD plug wires? I used Autolite brand one time and it shorted out after a week.
     
  3. Jan 26, 2009 at 2:46 PM
    #3
    nizzledizzle

    nizzledizzle [OP] Member

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    Nothing impressive. Bumber guard and clear corner lights
    Actually they have been replaced twice now. I'm not very knowledgeable on "good" manufacturers. The truck is currently in the shop and it even stumps them. What is the best way to clean the throttle body?
     
  4. Jan 26, 2009 at 2:48 PM
    #4
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    you can take the tb off or leave it on.....but use seafoam deep creep spray and a toothbrush, and scrub it good to get rid of the carbon buildup. also...you may wanna try a can of seafoam thru the brake booster line.......it'll clean the intake and combustion chamber out really well also.
     
  5. Jan 26, 2009 at 3:09 PM
    #5
    bobwilson1977

    bobwilson1977 Well-Known Member

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    I've had problems with the throttle body getting dirty on mine for years.Yes- they can make the truck run like crap when they get fouled up. Its better to take the whole thing off, which isn't that hard. Just make sure and get a new gasket for the throttle body. I generally clean it all up with Seafoam- which I agree is AWESOME stuff. I also remove the sensor screwed into the barrel of the intake manifold, clean it, then load up the entire intake with seafoam, re-install the throttle body, run it, then take one of the vacuum hoses off while running, then empty half a can of Seafoam into the syste, turn it off for 5 minutes, restart, and wallah- it runs a LOT better. You'd be amazed what a clean throttle body will do!
     
  6. Jan 26, 2009 at 3:35 PM
    #6
    HerNameIsLucy

    HerNameIsLucy I miss Lucy. :-(

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    Before you use the Seafoam pull the plug for #4. See if it's covered in oil, drowned in fuel, or steam cleaned white. That might give you an idea why it's not popping.

    Plug reading will be useless after the Seafoam. It'll clean it too well.
     
  7. Jan 26, 2009 at 6:10 PM
    #7
    Ry1984

    Ry1984 Well-Known Member

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    if you haven't used seafoam in a vacuum hose, just beware its gonna smoke like hell so if you have anal neighbors just keep it in mind.
     
  8. Jan 26, 2009 at 6:15 PM
    #8
    Toy4Life

    Toy4Life 668: The Neighbor of the Beast

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    Also, you can pull the Throttle Position Sensor and spray it with Electrical parts cleaner, work it, re-install it, and see what happens. It might not fix the CEL, but it's worth a shot.
     
  9. Jan 26, 2009 at 6:22 PM
    #9
    nizzledizzle

    nizzledizzle [OP] Member

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    Nothing impressive. Bumber guard and clear corner lights
    I have cleaned the mass air flow sensor already. Where is the TPS located?
     
  10. Jan 26, 2009 at 6:23 PM
    #10
    HerNameIsLucy

    HerNameIsLucy I miss Lucy. :-(

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    on the side of the throttle body
     
  11. Jan 26, 2009 at 6:24 PM
    #11
    nizzledizzle

    nizzledizzle [OP] Member

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    Aight. I'll give all these a try...it sure won't hurt it!
     
  12. Jan 28, 2009 at 10:49 AM
    #12
    nizzledizzle

    nizzledizzle [OP] Member

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    Out of curiosity, would it be better to run Sea Foam through the fuel tank or through the Brake Booster line?
     
  13. Jan 28, 2009 at 1:47 PM
    #13
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    what you do is run up to half thru the brake booster line, then half in the gas tank. the can says 1/3rd thru the brake booster,1/3rd in the oil, and the other 3rd in the gas tank........but i never add it to my oil, so half in brake booster and half in gas tank for me....................always works for me, havent had any problems.
     
  14. Jan 30, 2009 at 9:03 AM
    #14
    nizzledizzle

    nizzledizzle [OP] Member

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    THANK YOU ALL! I'm gonna buy stock in Sea Foam products! What an absolutely amazing outcome. My truck runs like it did when I bought it!!! No more skipping on the #4 cylinder, but I still need an o2 sensor. Thanks again!

    Nick
     
  15. Jan 30, 2009 at 9:07 AM
    #15
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Congrats Nick!!!

    I recommend getting your O2 sensor here
     
  16. Jan 30, 2009 at 9:11 AM
    #16
    HerNameIsLucy

    HerNameIsLucy I miss Lucy. :-(

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    try www.rockauto.com for the O2 sensor. OEM is denso, denso there is about 65 bucks. bought from them for years and never a problem.
     
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