1989 Ford f150 4.9l will not run when warm
35

Asked by Alan Apr 14, 2015 at 10:56 AM about the 1989 Ford F-150 XLT Lariat Standard Cab LB

Question type: Maintenance & Repair

Can anyone help - I have a 1989 F150 xlt lariet 4.9l stright 6. It runs really well till it warms up. I have replaced the following: new low pressure in tank fuel pump - new fuel filter x3 - new complete distribtor - new alternator - new battery - new plugs - and a new coil. Both Cats are clear as we dug them completely out and then welded them shut (both of them) Air flow at exhaust much improved. - - - This Trk starts and runs really strong when Florida cold. It varies how long it will run but not long then it starts to die as if it is getting fuel starved. Last time it did it I crawled under the trk and high pressure fuel pump is cool to the touch - filter was clear and I could blow through it both ways

5 Answers
103,735

Reelin68 answered 9 years ago

Replace you Engine Coolant Temp sensor. See if that cures it. Post back with results.

1 people found this helpful.
Mark helpful
35

Alan answered 9 years ago

I will do that and let you know. You are referring to the one mounted in the termostat housing right?

Mark helpful
35

Alan answered 5 years ago

nope - ended up being the fuel distribution reservoir for 2 tanks!

Mark helpful

Your Answer:

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