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Thread: Running rich, slow acceleration

  1. #11
    Administrator Senior member GobblerK5's Avatar
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    Yes sleep on it...let some other members chime in as well before you drill.

    Also, send forum member Iggy a PM and ask him what he thinks...

    Sent from my XT1585 using Tapatalk

    RIP - 1987 K5 Blazer - Silverado Edition
    305 TBI / 700r4 / 10 Bolts / 3.08s

    32x11.50x15 Buckshot Mudders on stock rallys
    Flowmaster 40 series with dual chrome tips out the back
    1987 K5 Silverado - Build Thread

    1991 K5 Blazer - Silverado Edition
    350 TBI / 4L60 / 10 bolts / 4.10s
    35x12.50x15 Cooper Discoverer STT on stock rallys
    1991 K5 Silverado - Build Thread
    NOVEMBER 2012 ----- TRUCK-OF-THE-MONTH!!!!
    APRIL 2013 ----- TRUCK-OF-THE-MONTH!!!!

    And my other ride ---> GobblerK5's 2004 Silverado 1500 Crew Cab - Not much building going on in here though

  2. #12


    I took a picture of the adjustment screw hole. I can't tell if that is the cap or if that's the screw itself...I sent Iggy a PM as well.


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  3. #13
    11 Bang Bang Fresh from the farm
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    Having kinda the same issue with my 85 305, any update on this issue?

  4. #14
    Quote Originally Posted by COSTA View Post
    Having kinda the same issue with my 85 305, any update on this issue?
    I got tired of messing with it and just put a Holley on. Sorry I couldn’t be of any help with any further update on the issue.


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  5. #15
    11 Bang Bang Fresh from the farm
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    So I'm guessing day and night once you switched over? Running strong? Pain in the a** these old Quadras. lol

  6. #16
    Quote Originally Posted by COSTA View Post
    So I'm guessing day and night once you switched over? Running strong? Pain in the a** these old Quadras. lol
    It ran like a whole different truck once I switched carb! It now has more get up and pep in its step now.


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  7. #17
    Senior member katncaed's Avatar
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    You probably just needed to rebuild the carb. Replacing it was pretty much the same thing. Does replacing it make the check engine light stay on or is that senor also on the Holley?
    We're working on it...


  8. #18
    11 Bang Bang Fresh from the farm
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    Thanks for the info man, I'm gonna go for the full rebuild and give it one last shot. Today I worked on it for a little and the 1st thing I noticed was all these black bits of carbon all over the filter and carb housing, plus all the screws for the top half were loose. Cleaned everything, tightened screws and it runs the same. Gas needle drops faster than the space shuttle on re-entry. Backfires but doesn't spit..

  9. #19
    Tom Senior member Iggy's Avatar
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    I would send the Electronic Quadrajet to Cliff's High Performance for a rebuild. The electronic ones are a little tricky and Cliff's has rebuild kits that are compatible with alcohol in the fuel.
    1990 GMC K5 Jimmy (Not the pretend Jimmy) with 454 TBI - TH400 - NP241C

    1981 Chevy K5 Blazer Mall Crawler with 350 Carb - TH700-R4 - NP241C

    When I die, I want to go out like my grandfather did, peacefully in his sleep, not screaming my head of like the passengers in his car!

  10. #20
    Senior member LT67's Avatar
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    What Iggy said..... have someone that knows Quadrajets rebuild it and calibrate it.

    I got a Quadrajet from a shop in Texas and they calibrated it to my engine specs. They got it pretty close.... throttle response on the 406 is razor sharp.

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