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Carb?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Hayduke, Jul 19, 2001.

  1. Hayduke

    Hayduke 1/2 ton status

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    hey there all, quick question for ya:
    my rig runs fine when i ride the gas softly and ease (but not grandma) up to speed. but when i hit the gas good it kinda bogs down and seems slower to speed up with black smoke outta the tail pipe, now when i put the pedel to the floor she scoots like a raped ape, still with some black smoke, i know that is gas and i can smell it when i let off the gas alltogether to slow or stop, my only question is if this carb problem could easily be fixed or should i rebuild it? could it be hurting other things? there's a 305 with 115K in there now and i'm just gonna let it run with proper tuneups and all until this rig is not my daily driver, then it will be my project and will get built up mean...
    thanks and peace.
    HAYDUKE

    Insured By COLT, Policy #.357M

    <a target="_blank" href=http://haydukesk5.coloradok5.com>http://haydukesk5.coloradok5.com</a>
     
  2. Waxer

    Waxer 1/2 ton status Author

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    Well we'd need to know which carb you have first off.

    If its the q-jet it sounds like your Primary metering rods arent being autoadjusted properly. You could have carbon or crud causing the power valve to stick. How is it at idle? Any black smoke or rich smelling exhaust?

    Crawlin the rocks with my K5
    <a target="_blank" href=http://www.rockreadyk5.com>http://www.rockreadyk5.com</a>
     
  3. Hayduke

    Hayduke 1/2 ton status

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    it's a q jet, it idles ok but starts to roughin some when sitting for a while idleing, and the exhaust does smell rich like gas, some black smoke too...
    peace.
    HAYDUKE

    Insured By COLT, Policy #.357M

    <a target="_blank" href=http://haydukesk5.coloradok5.com>http://haydukesk5.coloradok5.com</a>
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Fuel mixture too rich. I don't know the reason, but black smoke and smell means it's too rich. Rebuild your carb.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  5. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    Sounds like a sticking float to me but? I love my Edelbrock, It's so easy to take apart and mess with. Check the basics first.

    [​IMG]<font color=red>[/b]"Rid'in HigH in my K5"[​IMG]
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  6. Blazer79

    Blazer79 1/2 ton status

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    When you floor it, does it first bog a little and then take off perfectly fine? If so, It could be the secondaries opening too early. There's an adjusting screw on the passenger side of the carb, right in the secondaries shaft. You'll need an allen wrench to loosen a locking screw. Once that's loose, turn the adj. screw VERY LITTLE. 1/8 of a turn at most. I'm not sure, but I think turning it clockwise will make it harder to open, so they'll open later. If that doesn't work, turn it another 1/8 of a turn each try.

    On the idle problem, there are two screws on the front of the carb which control the idle mixture. Tighten them (clockwise) to lean the mixture out. Again, in very little steps until you notice a very slight increase in RPMs.

    Hope this helps.

    <font color=purple>//////
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    Soon a 454 K5!!</font color=black>
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