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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

some don't like it hot

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Old Jun 28, 2016 | 06:38 PM
  #1  
belchfire's Avatar
belchfire
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some don't like it hot

"90 F-250 4X4 351w 5spd. When I first start out and it's warmed up but still somewhat cold, I can rev it to 4 grand and it launches pretty well. After it gets really warmed up or it's a hot day it'll buck & cut out. It runs relatively cool (< 1/2 on the gauge) though I've got a 180 or 192 thermostat. It runs well @ at steady state but not for a load or speed. Most of the sensors are new. Where do I go next?
 
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Old Jun 28, 2016 | 08:09 PM
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rla2005
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Check for codes and fuel pressure. Test the pressure when it is running well and when it is stumbling. You need to determine if spark or fuel is dropping out.
 
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Old Jun 29, 2016 | 10:31 AM
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belchfire
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Thanks, I did have some problems with fuel when I did the conversion (it was a 302). Changed out the regulator and that seemed to help. Maybe it's crapping out again. I'll change the coil too.
 
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