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My one-evening Q-Jet rebuild

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blue85, Mar 15, 2006.

  1. Blue85

    Blue85 Troll Premium Member

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    I discoverd a couple of days ago that my poor idle was due to the carb leaking fuel into the intake manifold. Really, I've slowly noticed more of a gas smell in the garage over the past couple of years.

    So I decided to do an evening re-build. You know, tear into it after work and then drive it to work the next morning. What was I thinking?:doah:

    It actually wasn't too bad, but I got a little anal and started painting parts, which of course adds cure time. As soon as the parts were cleaned, I used JB Weld on the wells in the base of the carb. I replaced the gaskets, float, needle, seat, and accelerator pump seal. I also noticed that my main rods were a little bent, so I carefully straightened them out. One of the idle mixture screws was a little chewed on the end, so I filed it into the original taper. I had just replaced the choke pull-off and fuel filter a few weeks earlier.


    [​IMG]

    [​IMG]

    The second pic shows some of the epoxy. I will sell this carb once I get injected.

    My screw up happened during re-assembly. I pinched a vacuum hose between the throttle body and manifold gasket:doah: Easy enough to fix, but it squished the gasket there and caused a big vacuum leak. I couldn't get the truck to run for more than a few seconds, which makes troubleshooting hard. Finally I set the idle way high to keep it running while I ran in with my stethoscope. Some silicone fixed the leak and I went on to tune the idle mixture.

    This was the first time my idle mixture screws ever did anything:D The idle is smooth at 500rpm in gear. This is also the first time the vacuum gauge ever read 22 at idle. I got to bed late, but it ran great on the way to work this morning. The sweet taste of success.
     
  2. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    congrats! nothing like a job well done...

    i use to do it as a little sidegig.. rebuild carbs on the coffee table at night. :haha: pretty good coin for sitting there watching tv & drinking beer... and it was usually boat quads, so pairs meant double the money... :wink1:
     
  3. tiny2085

    tiny2085 1/2 ton status

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    how did you set your idles screws ? How many turns out from all the way in ? Is it a stock motor ?
     
  4. Blue85

    Blue85 Troll Premium Member

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    I am close to 4 turns out right now. I started at two and kept bringing them both out half a turn at a time. I will mess with them a little more this weekend, my first goal was to just get it driveable. The engine is a Goodwrench 350. Tall air filter, headers, duals, nothing radical.
     

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