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Posted on Feb 17, 2009
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My 351 is running rich

My 1984 F250 5.4 is running extremely rich.

  • Anonymous Mar 29, 2014

    what can I adjust to lean it out

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  • Master 2,920 Answers
  • Posted on Feb 17, 2009
Anonymous
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Use the air and gas flow adjustments on the side of the carburator to adjust the rich/lean flow of gas. there is a srew on each side of the carb to adjust one is for air the other for fuel. the one on the driversside is for the fuel and the one on the passenger side is for air. you have to turn them slowly til you get the desired results

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http://www.sansaworldmp3.com/
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If it ran extremely rich for months and now it won't start, the spark plugs are fouled out. Replacing them will fix your problem -- temporarily.

You'll probably want to check the O2 sensor(s) and replace them as they are probably the cause of the car running extremely rich.
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