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Thread: secondary carb problem

  1. #1
    Senior Member DYNO TECH
    Join Date
    Aug 2007
    Location
    Colebrook Connecticut
    Posts
    425

    secondary carb problem

    my carb is a holley 750 DP
    primaries are good but if im cruising and punch the throttle I get some breaking up or stumble initially then itll hook up?
    im thinking more pump shot or bigger shooter?

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Belleville, IL
    Posts
    658
    Lean is usually a hesitation and can even backfire out of the intake when the secondaries open until the main venturis have enough vacuum.

    Fat is usually a breaking up, with black smoke and backfires out the exhaust.

    You may have too much or too little accelerator pump.
    -WJ Birmingham

    OneBadGMC.com

  3. #3
    Senior Member DYNO TECH
    Join Date
    Aug 2007
    Location
    Colebrook Connecticut
    Posts
    425
    I havent noticed black smoke.
    I had a problem with the primaries before and fixed it by flipping the pink cam around and readjusting the pump arm for .015 at WOT.
    that gave me a huge initail pump shot then tapered off.
    might aswell try that on the secondaries too.


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