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'72 K5 - Bogging down on accelleration/backfire through carb

Discussion in 'The Garage' started by pdxk5, Jan 12, 2004.

  1. pdxk5

    pdxk5 Newbie

    Jan 12, 2004
    Likes Received:
    \'72 K5 - Bogging down on accelleration/backfire through carb

    '72 K5. 350, v-8 short block. Over 150k, smokes some on start up. Idles fine, even when reved at high RPMs. Will idle for extended period of time. However, when under load (ie in gear), it boggs down (when accellerate it acts like its flooded) with sporatic popping/backfire out of driver's side of carb's air intake.

    I've been told that it could be a loose timing chain, a stuck valve, the fuel injection pump in carb, or an out of balance distributor.

    Any ideas on potential source(s) of the problem and/or diagnostic tips or tricks would be appreciated.
  2. lukebaby1

    lukebaby1 1/2 ton status

    Dec 16, 2003
    Likes Received:
    Richmond, Virginia
    Re: \'72 K5 - Bogging down on accelleration/backfire through carb

    I would pull driver side valve cover and check your valvetrain. With that kind of mileage, could be a broken rocker, compressed valve spring, bent pushrod, bent valve(i.e. stuck valve). If you have a stock timing chain with 150000 on it, definitly time for a new one. /forums/images/graemlins/thumb.gif

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