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boggin in tahoe

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 76k5Blazer, Dec 6, 2002.

  1. 76k5Blazer

    76k5Blazer 1/2 ton status

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    i have a quadrajet carb on a sbc 350 the does fine at hollister and such i went up to tahoe and lost all my power and burnt hella gas
    whats the reasoning and what can i do to solve this problem when i goto the mountains ?? /forums/images/graemlins/ears.gif
     
  2. bryguy00b

    bryguy00b 3/4 ton status

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    dont know the answer to your prob...but i checked out your pics..nice k5!! /forums/images/graemlins/thumb.gif
     
  3. It's because of the air pressure and ratio of oxygen in the air. That's why computer controlled vehicles, for the most part, don't have that problem. Tey have a sensor for that ... I thinks it's the MAP sensor. Don't know how to fix it on a carbed engine though /forums/images/graemlins/frown.gif
     
  4. Silver84k5

    Silver84k5 1/2 ton status

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    im no expert, but cant you just jump under your hood and Lean out the carb?
     
  5. wrathORC

    wrathORC 1/2 ton status

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    Crawl under the hood and lean out the primaries. If you have sealed primaries you'll have to pull the carburetor and cut the body and chisel them out. Yeah, smile at GM for that one. If you get lucky you'll have plastic plugs and not metal ones.. which you can probably get out without removing the carb.
     
  6. reddog64

    reddog64 1/2 ton status

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    MAN...
    I thought there was gonna be a picture of a new tahoe boggin in the mud

    /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif
     
  7. 76k5Blazer

    76k5Blazer 1/2 ton status

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    the lean it out i would turn the 2 screws in rite /forums/images/graemlins/ears.gif
     
  8. MOABDADC22

    MOABDADC22 1/2 ton status

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    </font><blockquote><font class="small">In reply to:</font><hr />
    MAN...
    I thought there was gonna be a picture of a new tahoe boggin in the mud


    [/ QUOTE ]
    Tahoe on the rocks of Moab...... [​IMG]

    [​IMG]
    [​IMG]
     
  9. morphed86k10

    morphed86k10 1/2 ton status

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    actually, I think it just changes the mixture according to the O2 sensor, MAP stands for manifold absolute pressure, which varies from atmospheric pressure.
     
  10. 76k5Blazer

    76k5Blazer 1/2 ton status

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    a 76 k5 doesnt have 02s or cats
    so do i just turn in the 2 screws in front of the carb to lean it out and how much ??? /forums/images/graemlins/ears.gif
     
  11. morphed86k10

    morphed86k10 1/2 ton status

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    Yes I know that, but double check who I was replying too.
     
  12. redbeast

    redbeast Registered Member

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    Turning the two screws is just adjusting the idle mixture.
    You would have to change out the primary jets to get the change you are looking for.
     
  13. Blazer1970

    Blazer1970 1/2 ton status

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    redbeast is correct. You would have to change out the primary jets and/or the metering rods. Adjusting the idle isn't going to help anything. On a Q-Jet, you have to disassmble the carb to change the jets/rods.

    Some of the later model Q-Jets have an "aneroid" (I think that's what it's called) which is supposed to help with altitude compensation, but I am not sure how, or how good it works. Fuel injection is the real cure for this.
     

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