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Carb Problem?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MilpitasK5, Dec 26, 2001.

  1. MilpitasK5

    MilpitasK5 1/2 ton status

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    I just put a new block in my 86' K5 but I didn't replace the carb. Whenever I start my rig cold, it puffs quite a bit and starts to back fire a little blowing black smoke out. RPMs are all over the place until it warms up a bit. As soon as it gets a bit warmer, RPMs go steady. Do you think this may be a carb problem?

    Thanks,
    Chris
     
  2. zakk

    zakk 1/2 ton status

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    possibly. make sure all the vacuum hoses are attached also.

    -zakk

    '77 1-Ton K5

    [​IMG] CK5's MOAB 2002 OR BUST!! [​IMG]
     
  3. txbartman

    txbartman 1/2 ton status

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    If your RPMs are all over the place until it warms up, sounds like a choke problem. I am no crab expert (to say the least), but I would start there.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  4. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    yes sir. carb related. the black smoke is telling you its pig rich and just too much fuel. Its supposed to be rich on first start up when it is cold, but not so rich it is blowing black smoke.
    This sounds exactly like my dad's '77 chev truck... brand new crate 350.. even a new Rochester QJET, but with the heat riser choke, it takes like 5 minutes before you can take your foot off the gas and let it idle or it would foul out and stall. And it blows black smoke for the first couple minutes.

    More information could certainly be helpful... what carb.. what kind of choke? electric or heat riser?

    [REAL MEN DON"T CARE ABOUT GAS MILEAGE OR RAPID TIRE WEAR!]
    Ryan B.
     
  5. MilpitasK5

    MilpitasK5 1/2 ton status

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    Thank you for the input. Don't laugh but I'm only in tune to the basics when it comes to cars. That's why I bought this rig because i will be forced to learn.
    I only know that I have a Q-Jet. Your description of your dad's ride sounds exactly like mine though. How can I tell what kind of a choke I have?
    P.S. I appreciate your help!
    Chris
     
  6. MilpitasK5

    MilpitasK5 1/2 ton status

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    Will do. Thanks!
     
  7. txbartman

    txbartman 1/2 ton status

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    For some basic carb info, go to My Jimmy with all her projects!
     
  8. MilpitasK5

    MilpitasK5 1/2 ton status

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    Sweet! Thanks!
     

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