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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Cold engine = Bad performance.

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Old Aug 15, 2006 | 03:24 PM
  #1  
Galizien's Avatar
Galizien
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Cold engine = Bad performance.

My 94 w/302 and fresh transmission has been having a problem where when I first start the truck and drive, I get sluggish power.

Then it seems like after about 30-60 seconds of taking it easy out of the neighborhood, the truck wakes up, like the engine temp goes more to normal and the truck drives 100% fine, no problems at all.


As far as I can tell fuel system seems good, fuel filter is new, gas is good, fuel pump seems to work fine. Its as if the the engine is encountering resistance. Not so sure though.

Could a bad thermostat cause these symptoms? acting like a blockage in the cooling system?

I have a slight exhaust leak near the Y pipe, and when it goes through the 1 minute of cold running lazyness, the exhaust leak gets alot louder. Could this be a clue?
 
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Old Aug 15, 2006 | 03:26 PM
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Have you replaced/cleaned the idle air control valve?
 
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Old Aug 15, 2006 | 06:39 PM
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Galizien
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I have not replaced it, but I have cleaned the hell out of it.

It still gives me fluctuating idle every once and a while, cold engine or hot engine..


Do you think this could be a probable cause of the poor cold engine performance?
 
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Old Aug 15, 2006 | 06:56 PM
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sometimes they can be cleaned and sometimes they need to be replaced.
 
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Old Aug 15, 2006 | 10:12 PM
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I'd say it would be. Try replacing it. If it doesn't fix it you probably needed a new one anyway.
 
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