Cleaning throttle body raised idle too high

Discussion in 'LSX + Carb Swaps' started by SuperTramp, Feb 23, 2020.

  1. SuperTramp

    SuperTramp I'm Awesome

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    After removing and cleaning throttle body of carbon build up, I cleaned out intake manifold without removing it using carb cleaner, wire bore bristle brush then wiped clean with rags on the end of 12 ga. cleaning rod. I fashioned a clear, 3/8” plastic hose to vacuum to remove any loose debris (that was technique sharing ) after reassembling, while driving, the idle was 2k+. I’d give gas pedal quick pump which would bring idle down by only 250-500 rpm. Friend said to disconnect pos and neg. cables from battery and attach them together for 5 min to reset the computer. His reasoning was the computer had been compensating for the excess build up of carbon. With carbon gone, the computer needed to be reset. Has anyone tried this and received lower idle? My cable ends wouldn’t touch so I used a jumper cable. I also removed the cruise control cable since it was taunt and the cable to the petal wasn’t. The idle is now down to 1100rpm but that’s with CC cable disconnected. Please share you solutions for this. Thank you in advance.
     
  2. texas tough

    texas tough OBS Enthusiast

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    did u replace the IAC and throttle body gasket with new ones?
    did you turn the pintle on the IAC any when u were cleaning it?
    if u jumper the A and B terminals on the diagnostic connector, it will reset the pintle..
    a vacuum leak will cause a high idle.. IAC controls Idle.,. also look for poor electrical connections at plug connectors. pins pushed out of thier positions, ect.
     
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  3. SuperTramp

    SuperTramp I'm Awesome

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    Thanks for your response. What’s an IAC? I did use a new rubber TB gasket. Once I know what an IAC is I’ll change the gasket. what is a pintle? ( Sorry I’m so uninformed ) is the diagnostic connector the plug under the very bottom of the drivers side dash-used to check codes? Do you use a small piece of copper wire to serve as a jumper? I’ll look on YouTube to see how to check for vacuum leaks, unless you have a better idea. Thanks for the information and your patience.
     
  4. SuperTramp

    SuperTramp I'm Awesome

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    This video answered several of my questions. I’ll let you know how it works out. Thx.
     
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  5. PlayingWithTBI

    PlayingWithTBI Desert Old Guy

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  6. SuperTramp

    SuperTramp I'm Awesome

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    Thanks
     
  7. SuperTramp

    SuperTramp I'm Awesome

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    TBI- Auto acronyms and terms you sent me is very helpful. Thx.


    Sent from my iPhone using Tapatalk
     
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  8. PlayingWithTBI

    PlayingWithTBI Desert Old Guy

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    Study them, there's gonna be a test later :lol::lol::lol:
     
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  9. SuperTramp

    SuperTramp I'm Awesome

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    ...test, like ever other day of my life. Lol


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  10. SuperTramp

    SuperTramp I'm Awesome

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    Thank you Texas Tough!!! Replaced IAC and idle is back to normal. all is working much better.
     

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