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Throttle Body Butteryfly valve

Discussion in 'Technical Chat' started by 96Taco, May 13, 2011.

  1. May 13, 2011 at 8:31 PM
    #1
    96Taco

    96Taco [OP] Well-Known Member

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    I removed the throttle body today to give it a good clean out.

    I noticed when the throttle is fully closed I can see some of a gap between the butterfly valve and the throttle body. Especially when holding it up to the sky I can see some daylight between the flap and body. Is this normal?

    I have high idle problems and im wondering if the extra air which can sneak thru here is causing the slightly higher idle?

    Does this make sense? I hope someone can help out, thanks :)
     
  2. May 15, 2011 at 11:03 AM
    #2
    96Taco

    96Taco [OP] Well-Known Member

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    Anybody??
     
  3. May 15, 2011 at 11:05 AM
    #3
    whippersnapper02

    whippersnapper02 Well-Known Member

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    The butterfly valve wouldn't just simply wear away and cause a larger gap unless it was rubbing the housing the whole time. Have you checked the IAC valve?
     
  4. May 15, 2011 at 11:08 AM
    #4
    TheDuDe06

    TheDuDe06 TEE ARE DEE

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    Its normal to have a little gap.
     
  5. May 15, 2011 at 11:10 AM
    #5
    TRDKenE

    TRDKenE DAMN GOOD DEAL!!

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    the gap is normal for most throttle bodies...high idle could be caused by a vacuum leak or perhaps an idle control valve also maybe a mass air meter. also try disconnecting the battery for 30 minutes to reset the computers learned adaptations...dont get scared if the truck stalls once or twice after the battery has been disconnected its normal...let it idle for about 5 minutes.
     
  6. May 15, 2011 at 11:25 AM
    #6
    rab89

    rab89 Well-Known Member

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    I don't know, but I would say there has to be a gap for the truck to idle...
    it needs that little bit of air.
     
  7. May 15, 2011 at 4:44 PM
    #7
    skytower

    skytower Well-Known Member

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    Idle air control valve takes care of idle speed. The throttle has a set gap, do not mess with it.
    If the truck runs fine, other than high idle, you have a metered air issue. This would point to the IAC having carbon build up and not seating, which allows more air and a higher idle. If it hesitates, you have an unmetered air problem. Vac lines or intake has a leak after the MAF sensor.
     
  8. May 16, 2011 at 9:21 AM
    #8
    96Taco

    96Taco [OP] Well-Known Member

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    Thanks guys, great advice. WIll replace the IAC - hopefully I can find one cheap online. Dealership was a little over $700!

    When cleaning the throttle body I tried to get the IAC off to inspect but one of the screws was very soft and it just shreaded the fitting.

    I tried turning the throttle back manually really hard and playing with it. This reduced RPM to 1000rpms. Not sure if this would be damaging it or indicating a throttle body issue? As soon as I tapped the gas pedal again tho it was back to normal high idle.
     
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