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Thread: Hesitation when accelerating

  1. #1

    Default Hesitation when accelerating

    I have hesitation when accel off idle and off cruising. I just increased the the pump shot nozzle from .031 to .037 as big as i can without installing and larger pump with no effect. I have a stock ford 351w and confused why this wouldnt be enough. has anyone been through this? would changing pump cams help? this is 1850-9 carb. Anyone want to buy my carb so i can go buy a idlebrock!!!

  2. #2
    Join Date
    Dec 2009
    Location
    Ellington, CT
    Posts
    4,505

    Default

    Make sure you're not exposing too much of the 'idle transfer slot' at idle (primary throttle blade adjustment). Common problem. If so, you'll need to open the secondary blades a little bit, in order to close the primary blades (without altering the idle speed). Holley has a good video pertaining to this: http://www.youtube.com/playlist?list=PL353239D6A7D7BFF0 (Click "How To Adjust The Secondary Speed Screw") View all their carb tuning videos!
    May God's Grace Bless You

    '78 BRONCO: 508" stroker, TFS heads, Dominator MPFI & DIS, cold air induction, dual 3" exhaust/Magnaflow mufflers, 100HP progressive dry direct-port NOS, A/C, Lentech Strip Terminator wide-ratio AOD, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, custom traction bars, 4" lift, 35" mud tires

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