1997 Ford Truck engine electrical

1997 FORD TRUCK
172,000 MILES • V8 • 4WD • AUTOMATIC
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MASSIE
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motor starts runs fine.after motor is warmed up
and drivenif you shut it off it will not restart for 1 hr.
has fuel at fuel rail seems to have no spark,could it be
coil packs.
Mar 10, 2010 at 8:26 PM
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SERVICE WRITER
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Sounds like a temperature related situation that can be sometimes flushed out by cooling down with a damp washcloth that is put into the freezer prior to the expected no start. Put the washcloth on a suspected item and it will cool it down. If it restarts, you found your problem. Conversely you can use a hairdryer to heat a component when it cold to create a no start.
Assuming this is a loss of spark. Use a spark tester to verify this is what is missing.

Not sure which engine or particular truck you have and assuming there are multiple coil packs, I would lean away from all coils going bad at once. Misfires would be more of an expected results. A weak ignition module
would be more likley as the coils get the power from it.

Are there any codes stored in the pcm?
Mar 11, 2010 at 4:07 AM
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