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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

highspeed=roughrun HELP

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Old Oct 26, 2010 | 06:18 PM
  #16  
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Did you find the problem? Mine has started missing under load after it warms up.
 
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Old Oct 26, 2010 | 06:48 PM
  #17  
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not yet...waiting on the brother in law to lend me his scanner this week so i can check all the codes and run some diagnostics
 
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Old Oct 31, 2010 | 04:17 PM
  #18  
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so i got the codes checked....there were no computer codes in memory, which puzzles me a bit....the check engine light must be being triggered by the misfire( which wasn't as bad the last time the truck was out ) . The promising thing was while my buddy was checking the codes he notice the wire connector that comes off the capacitor at the bottom of the coil was touching the engine and was melted a lil....which he thinks may have been causing the coil to short out. I have not had the truck out since i fixed this problem but I will keep you posted
 
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Old Nov 6, 2010 | 08:17 PM
  #19  
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had it out on the highway today and it didn't have any problems...wasn't a long trip but it looks promising
 
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Old Nov 15, 2010 | 02:07 PM
  #20  
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still runs a lil out of sorts but much better ...here are the KOER codes that I am getting from my SNAP-ON Scanner 23, 41, 13, 77.....this lead me to believe that it is TPS that is acting up ? yes? no? maybe?
 
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Old Dec 17, 2010 | 03:59 PM
  #21  
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please help

have changed the tps and most of the running condition is better...have much better throttle response, the cleaner throttle body and intake has also greatly helped the idle.

The problem still remains a loss of power and shutter between 80 and 100km once the engine warms up....i am still getting a code for the 02 sensor being lean...is it possible that it is causing the PCM to want to dump fuel to correct the lean condition to the extreme that it is flooding the engine at high speed
 
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Old Dec 19, 2010 | 07:16 PM
  #22  
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and

just checked fuel pressure regulator by popping off the vacuum line and everything seemed fine ( vac on line and no fuel blowing through) please post any advice you might have...i am at my wits end and losing sleep over this
 
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