The truck is a 1991 F150 with the 5.0L v8. When its hot outside is will sometimes begin to sputter and backfire then stall. Will sometime start right away but will only idle, trying to accelerate will cause it to die. If it sits for 30 minutes it will start and run fine util everything begins to heat up again. I have repalced the fuel filter and check the gas lines. They are run away from all extreme heat sources. The check engine light is funtional but is not coming on. Does anyone have any suggestions?

Thank you

 

Try looking at my thread: Tell Tale? Symptoms... I think it may be related to the TFI module.

 

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Please post the solution? My truck has similar symptoms.

 

sounds like the run of the mill ignition module going bad they usually fail with heat and work again after they cool down

 

No, I replaced that, getting same problem, see my post..

Thanks!

 

The truck is a 1991 F150 with the 5.0L v8. When its hot outside is will sometimes begin to sputter and backfire then stall. Will sometime start right away but will only idle, trying to accelerate will cause it to die. If it sits for 30 minutes it will start and run fine util everything begins to heat up again. I have repalced the fuel filter and check the gas lines. They are run away from all extreme heat sources. The check engine light is funtional but is not coming on. Does anyone have any suggestions?

Thank you



-sorry i didnt see ignition module in there thats why i mentioned it

 

That is just above the thermostat housing, just below the distributor...

 

usually that will just cause it to run rich not stall out but i guess its possible, it should throw a code

 

As strange as it may sound, I fixed my problem when I found corroded wires going to the frame mounted fuel pump. The wires ran behind a diagonal bar in the frame, and were out of sight. The insulation was breached where the wire rubbed the steel, and the wires were corroded. For some reason I can't explain, the connection was good when the truck was cool, but when it warmed up (either by running, or by heating from the warmth of mid-day) it would die, and not start again.

Check your fuel pressure.