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big problem

Old Dec 14, 2003 | 06:02 PM
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chris69
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big problem

my 78 f-150 has a problem. when i'm in gear black smoke comes out of the exaust. when it is in nuetral and i rev it up it clears out the black smoke. but when i put it in gear again and start driving it tyurns black again. what is wrong.
another problem is that i only get about 3 miles to the gallon. i dont know what is wrong, please help me
 
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Old Dec 14, 2003 | 06:14 PM
  #2  
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Torque1st
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Bad power valve.
 
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Old Dec 14, 2003 | 11:15 PM
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From: Louisville,Ky.
Could be the powervalve, choke not opening, float level too high or a piece of debris stuck in the needle and seat. Anyway, your carb is dumping too much fuel down into the engine. Most likely from one of the items listed above.
Jimmy
 
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