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Q-jet carb. adjustment

Discussion in 'Chevy Trucks' started by Rickco, Dec 11, 2006.

  1. Rickco

    Rickco Member
    Messages: 89

    Ive got a85 with a 350 and Qjet that is running rich. what do i need to do to lean this out,just a bit. Thanx
  2. joe_padavano

    joe_padavano Member
    Messages: 68

    The first problem is to figure out why it's running rich. Is this carb original and correct for this application? If so, there's something else wrong. Has it been rebuilt recently? You could have dirt in the needle and seat or a leaking seat. Your float could have gone bad, since the newer additives in gasoline attach the plastic float used in the Qjet. A heavy float will definitely cause a rich condition. Is the choke opening up fully? The choke coil could be bad.
  3. q jet

    just a stupit question check the exaust flap in the passengers side could be closed. tare the carb apart they are easy dont be scared . take a good look at the plugs they will tell a good story.
  4. poncho62

    poncho62 Senior Member
    Messages: 431

    Check your choke assembly....probably needs lubricating.
  5. yzf1000_rider

    yzf1000_rider Senior Member
    Messages: 147

    also when you do adjust the carb hook a vacume gauge up to a diresct manifold vacume and adjust the carb to get the best vacume possible should be right around 17 inches is almost perfect. hope it helps.