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Can a bad carb cause intermittant backfireing?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Piranha300, Sep 17, 2002.

  1. Piranha300

    Piranha300 Registered Member

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    The car has been stored for about 3 years. It seems to only do it after I fill up with gas. It seems to flood and miss and then backfire. It will then run fine for awhile? Any info would be great. Thanks
     
  2. Sandman

    Sandman 3/4 ton status Author

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    How much have you run it since it has been out of storage? I have seen this before but it cleared up when the engine was ran for some time. Stickey lifters I guess. Your Carb might be dumping too much gas down it also. Causing it to load up.
     
  3. chevyracing

    chevyracing 1/2 ton status

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    when you say "backfire" are you talking about popping out of the carb or the tailpipes?

    John
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Could. A carb sitting that long is NEVER good. I rebuilt a carb last weekend that had only sat for about a year and you should have seen the crid in the bottom and stuck to the meetering rods. Rebuild it.
     
  5. twenty_below0

    twenty_below0 1/2 ton status

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    Grim would you be willing to rebuild a carb for me if I was to throw some cash your way? And if not could you suggest a place to do this
    Just a 74 quadrapuke. p.m. me
    Also I have had Carbs stored for a few years in a bag out of the weather in the house and had no problems with it, maybe just lucky?
     
  6. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Well if they were drained then it might not be so bad and they may function. Problem is the only way to drain them is turn them upside down. till all the fuel is out of them. If you did that then it worked. If the sit with fuel in them the fuel will evaporate and leave a chalky residue that may jam the meetering rods. there is also a concern that the stuff like the valve and the accelerator pump rubber will dry rot.
    Honestly other than you might need to have a machine shop install a new set of bushings for the shafts, this is really not that hard. A rebuild just consists of replacing seals and cleaning. If your very carefull to not bend any linkages about the only thing you need to do is check the float level and adjust the choke and idle mix.
     

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