Rebuilt Rochester 2B Carburetor - Now Idle Runs Very High

Discussion in 'Chevy Truck Forum' started by Lennie Friedman, Dec 10, 2017.

  1. Lennie Friedman

    Lennie Friedman Full Member

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    Dear Chevy Truck Forum-

    I rebuilt my 1980 Chevy C10 Rochester 2 Barrel Carburetor. My first rebuild. The Truck drives great now, but I have noticed two issues I cannot figure out
    (1) The truck idles extremely high in Park/Neutral. The idle screw is nearly as loose as it can get. So it is not the idle screw. At idle and engine warm the throttle damper is wide open letting in the maximum amount of air. What can be causing such a high idle?
    (2) When I first start the truck (and it does start far easier after the rebuild, it will stall when first putting it into gear. Not sure what is driving that either.

    Thank you for your thoughts.

    Best,
    Lennie
     
  2. smokybandit

    smokybandit Full Member

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    You tried adjusting your Distributor? Also stalling when put in to gear could be Torque converter related. With it being early 80's have you checked vacuum lines, and throttle linkage bar if it has one.
     
  3. Lennie Friedman

    Lennie Friedman Full Member

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    I have checked all vacuum hoses. They have been painful to deal with, but I have eliminated all but the essentials.

    I am still relatively new to this, so allow some baseline questions. Would adjusting the distributor impact the Idle (which is my main concern)?
     
  4. smokybandit

    smokybandit Full Member

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    By advancing or retarding the distributor you can adjust the idle to some extent.
    Advancing increases the idle where Retarding reduces it.
     
  5. scavanger

    scavanger Full Member

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    sounds like a vacuum leak , maybe wrong base gasket ?
     
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  6. JTWard

    JTWard Full Member

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    Have you checked the AT downshift cable ? I know the manual and automatic is different. So is the accelerator and the down shift cables louse enough to let the throttle butterflies go all the way back down ?
     
  7. Lennie Friedman

    Lennie Friedman Full Member

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    Thanks! I used a rebuild kit and checked thebgaskets prior to putting them on. I think they are correct. However I will recheck all bolts etc today.
     
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  8. Lennie Friedman

    Lennie Friedman Full Member

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    I have an automatic. Does this still apply? If so, how would I check?
     
  9. JTWard

    JTWard Full Member

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    Sure, you still have an accelerator and transmission cables. Just pull on them lightly, I'm not saying that is the problem, but it wouldn't be the first worn out cables. Sometimes the cable is sitting inside the plastic cable housing and it only moves slightly for 30 years, it starts to cut into the housing.
     
  10. leolkfrm

    leolkfrm Full Member

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    Sounds like it may be on the first step of the high idle cam
     
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