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Surging

Discussion in 'The Garage' started by RustBuket, Sep 4, 2003.

  1. RustBuket

    RustBuket 1/2 ton status

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    I have a freshly rebuilt 305 in my blazer and it is having carb problems. Its all stock except for headers, dual exhaust, and a edelbrock performer intake. The truck seems to surge at idle. The rpm will not stay constant. I think this is symptoms of a rich mixture because the truck runs very cool and you can smell gas as you drive with the window open. How can I adjust this? Do I need a vaccuum gauge?
     
  2. RustBuket

    RustBuket 1/2 ton status

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    Nobody?
     
  3. Twiz

    Twiz 1/2 ton status

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    I'd say your on the right track.

    Surging is a common symtom of a rich mix.
    Assuming everything else is stock (including the carb), except for a free-slowing exhuast/intake. The engine can breath better, then the stock carb was calibrated for.
    Richening the jets, and changing the meetering rods, may correct the problem.

    Make one small change at a time, drive it, and change again as needed.
     
  4. RustBuket

    RustBuket 1/2 ton status

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    So you think I should richen it even more? Would adjusting the idle mixture help?
     
  5. Twiz

    Twiz 1/2 ton status

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    Opps....

    I think it needs to be leaned out.
    I'm not sure what the hell I was thinking on that other reply. Made sence at the time.. /forums/images/graemlins/grin.gif
     
  6. RustBuket

    RustBuket 1/2 ton status

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    Ok, well I'll see what I can do.
     

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