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Loud BANG from Carb

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Chris1972, Jan 28, 2001.

  1. Chris1972

    Chris1972 Registered Member

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    I have just finished replacing the valves on my 400 engine.
    The ignition is set correctly and the engine idles like a cat.
    But when i give is some gas there is several loud bangs from the carb. there is no exhaust comming up throu the carb and
    cant figure out the cause.
    I am getting desperate for an answer........


    Chris

    www.broadpark.no/~csteinsv/
     
  2. Butch

    Butch 1/2 ton status

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    Location:
    Austin, TX
    When mine did that the valves were sticking in the guides and not closing all the way. At idle was perfect at 1800 RPM it sounded like it was coming apart. You could also have weak vavle springs, or you could have them adjusted too tight and when they pump up it is not letting the valves close.

    I thought I was wrong once,
    but I was mistaken
     
  3. jimmyjack

    jimmyjack 1/2 ton status

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    It sounds like an exhaust valve isnt closing. Could be a bad spring or guide sticking. Hope it isnt your cam lobe. I had my distributor 180 degrees out of whack once(just once). Honest mistake. Good luck.

    creepin' and crawlin'

    Jim
     

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