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Engine gurus-long but please read

Discussion in 'The Garage' started by crazyrc, Oct 6, 2003.

  1. crazyrc

    crazyrc 1/2 ton status

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    Here's my story. Engine is a built 406, blah,blah blah.
    Problem is I have poor idle, and poor power below 3000 RPM. It starts to run better after 3000, but its still not doing what it should. Engine is virtually new. Power is...or was incredible from idle to 6000. This thing would roast the boggers on dry pavement. Now it barely wants to spin them in mud. (until I get the revs up) The engine also runs on after shutting it off...and the timing was double checked. I think it could maybe be overfueling as the exhaust smells very rich. I checked the floats on the carb and set them accordingly. I thought the HUGE fuel pump I put on may be causing thge pronblem, so I also installed a pressure regulator...No better. Please help.
    I'll pull the spark plugs tommorow. /forums/images/graemlins/confused.gif
     
  2. clubba68

    clubba68 1/2 ton status

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    It does have the symptoms of an engine running rich.
     
  3. Confedneck

    Confedneck 3/4 ton status

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    most definately running rich, my truck had a run on problem when i was first messing with the carburetor, i re-adjusted the idle mixture and it fixed it, raise the idle speed a little bit with the adjuster screw, then screw the 2 side screws on the front sides of the carb in until it loses rpms..check for power...repeat until its right..
     
  4. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Running rich or a huge vaccum leak......
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    huge vaccum leak......

    [/ QUOTE ]

    Which would cause a LEAN condition. /forums/images/graemlins/thinking.gif /forums/images/graemlins/confused.gif

    I am thinking the choke is stuck or something. I'm sure hwen you do pull the plugs you'll find them black and sooty.
     
  6. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    only refering to the vaccum leak as a possibility as far as the advance on the distrib.......who knows
     
  7. diesel4me

    diesel4me 1 ton status Premium Member

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    It could be too much fuel pressure,or perhaps if its a holley carb,it might have a blown power valve.Or maybe the scondary butterflys arent opening.Good luck! /forums/images/graemlins/grin.gif
     

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