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Moved carb, now it idles very low

Discussion in 'The Garage' started by ankarback, Sep 2, 2005.

  1. ankarback

    ankarback 1/2 ton status

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    I've moved my Quadrajet carb from my blazer to my new suburban and when I started it up the idle is very low. Only difference between the trucks is that the suburban doesn't have A/C so it doesn't have the little plastic vaccum-tank for that. I plugged that vaccumport but can this really affect the idlespeed or did I mess something up?
    Offcourse the easiest fix is just to turn up the idlescrew but I like to know what causes this before I do that. Anyone have an idea what's wrong?
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Both trucks may have the same size engine . But I betcha cams and heads may be different enough . You always must fine tune it to the engine its on . There is no such thing as bolting it on and going .
     
  3. MTMike

    MTMike 1/2 ton status

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    Also check the timing - if it's too retarded it will idle low... too advanced will idle high.

    Mike
     

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