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99 Tacoma Idled to High?

Discussion in '1st Gen. Tacomas (1995-2004)' started by scalfee90, Dec 19, 2010.

  1. Dec 19, 2010 at 11:42 AM
    #1
    scalfee90

    scalfee90 [OP] Well-Known Member

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    I have a 99 with a 3.4 v6 and its idling around 2000 RPM. It seems like it may be a MAP sensor because when i come to a red light the RPMs start jumping up and down. I did try a new TPS but it doesn't even make a bit of difference. Any ideas would be good! Thanks!
     
  2. Dec 19, 2010 at 3:02 PM
    #2
    mcguire

    mcguire Well-Known Member

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    andrew
    Rothesay New Brunswick, Canada
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    sky jacker leaf pack,crappy crap spacers,3"body lift,33" trail diggers,K&N intake,magnaflow muffler and high flow cat.
    Try cleaning the IACV, it worked for me when my idle was screwy. Worth a shot
     
  3. Dec 19, 2010 at 3:24 PM
    #3
    travis9287

    travis9287 Roll Tide!

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    I think you just need a tw sticker and that'll fix all your problems. Lol. But in all seriousness try the sensor.
     
  4. Dec 19, 2010 at 8:05 PM
    #4
    CdnSldr

    CdnSldr Well-Known Member

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    Northwestern Ontario (the only good part of ON)
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    I think you may mean MAF (mass air flow) the one just after the air filter not MAP (manifold absolute pressure).

    I agree tho, that is a very common symptom for a bad MAF sensor.
     
  5. Dec 19, 2010 at 8:29 PM
    #5
    90YotaPU

    90YotaPU The Messiah

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    I would look either at your spark plugs or maybe for a vacuum leak. My '99 idled high as well. The few times I had problems with my MAF sensor, the only real symptom was when I pressed on the throttle it would take a few seconds to respond. It would feel like it fell on it's face when you went to take off.
     
  6. Dec 19, 2010 at 10:26 PM
    #6
    scalfee90

    scalfee90 [OP] Well-Known Member

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    Custom skid plate, rock rails, front bumper & rear bumper, pioneer head unit with 3-way pioneer components, blinker mod, Eibach coils, Bilstein 5100s, Procomp AALs, American Racing Sawblades, M/Ts, BPV Bracket, deckplate, LED Dash
    Thanks for the input! I'll start poking around tomorrow to see what I can accomplish. Keep suggestions coming!
     
  7. Dec 19, 2010 at 10:31 PM
    #7
    Leadgolem

    Leadgolem Well-Known Member

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    You might give seafoam a try. My 2.7L would idle at 1000rpm then drop to 500, then jump back up to 1000 over and over again. That's after it was warmed up. After I ran 1/3 of a can of seafoam through the vacuum assist line the idle smoothed out to 750 rpm after it's warm.
     
  8. Dec 20, 2010 at 9:07 AM
    #8
    scalfee90

    scalfee90 [OP] Well-Known Member

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    I'll be sure to do all of the above so I can eliminate the problem!
     
  9. Dec 20, 2010 at 5:45 PM
    #9
    travis9287

    travis9287 Roll Tide!

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    We need to get together wed and look at this, because i just noticed mine is idled a "little" high, around 1k rpm at stops. aint it suppose to be around 700?
     
  10. Dec 20, 2010 at 6:13 PM
    #10
    Leadgolem

    Leadgolem Well-Known Member

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    It also depends on whether the engine is warmed up. Mine starts at 1.2k usually. Higher if it's really cold. Then the idle goes down as the engine warms up. Once it's warm it's 750.
     
  11. Dec 20, 2010 at 6:39 PM
    #11
    travis9287

    travis9287 Roll Tide!

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    Okay, it was about 48 deegres here and it hadnt been driven yet when i noticed it, ill pay attention if it idles down when it warms up.
     
  12. Dec 23, 2010 at 10:50 PM
    #12
    scalfee90

    scalfee90 [OP] Well-Known Member

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    it turns out that i just have a worn out, tampered throttle valve. I got a guy willing to give me the part and put it on for a few dollars.
     
  13. Dec 28, 2010 at 7:04 PM
    #13
    scalfee90

    scalfee90 [OP] Well-Known Member

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    Ok found the problem! I got a friend to put a whole throttle body on and didn't do anything. So we looked and found the throttle valve was corroded, cleaned it up and was idling wonderful.
     
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