1997 Ford F150 Poor running after warm up

1997 FORD F-150
97,000 MILES • V8 • 2WD • AUTOMATIC
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GRASSLANDPOWER
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  • 3 POSTS
My F150 Starts like new when cold starting. As it warms up it starts to hesitate and then eventually will not idle and dies out. Basic tune-up has been done. I do not know the history of this Truck, I bought it from a small dealer and he is un-willing to help in any way. Any ideas would be helpful
Jun 4, 2008 at 6:00 AM
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MERLIN2021
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  • 17,250 POSTS
Is the check engine light on?
Jun 4, 2008 at 6:14 AM
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GRASSLANDPOWER
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Not sure on the check engine. Have not been using the Truck. I will get back to you very soon.

Thanks

Jeff
Jun 4, 2008 at 6:21 AM
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GRASSLANDPOWER
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I did check the Truck again ... as always, it starts perfect but then will hardly run after warm up. Check Engine Light did NOT come on when running. Did light up when key turned on as expected.
Jun 4, 2008 at 7:30 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
Once it warms up it goes into closed loop and all sensors are added into the mix...Map or MAF, even the ECT which acts like the choke could be a bit out of range. Check also for stuck EGR.
Jun 4, 2008 at 7:37 PM
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