Engine cranks over but won't start when Hot
04-22-2016, 03:09 PM
#1
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Engine cranks over but won't start when Hot
I have a Ford F150 1996 4.9L inline 6. Only when it is over 80 degrees outside, and the engine is up to temperature, and it has been sitting for over 5 minutes, it is very difficult to start (only a problem when all conditions are met). Sometimes I have to allow it to cool before it will start (30 minutes or so). BTW this engine runs like a sewing machine when it cranks, no symptoms.
This is very weird, and screams to be a temperature sensitive electrical problem. I had replaced the plugs, wires, ignition module, checked all plug connections, and same symptoms continued. I started looking online and saw where a guy had similar issues and replaced his fuel pump (in the tank). I thought no-way, but I have 300k miles on the truck and figured I probably was due for a pump soon anyway.
Shock and Awe, this fixed my problem don't have an explanation as to what was happening but wanted to give a shout-out, maybe this will help someone else.
This is very weird, and screams to be a temperature sensitive electrical problem. I had replaced the plugs, wires, ignition module, checked all plug connections, and same symptoms continued. I started looking online and saw where a guy had similar issues and replaced his fuel pump (in the tank). I thought no-way, but I have 300k miles on the truck and figured I probably was due for a pump soon anyway.
Shock and Awe, this fixed my problem don't have an explanation as to what was happening but wanted to give a shout-out, maybe this will help someone else.
07-20-2016, 03:57 PM
#4
Junior Member
I have heard recently that the 87s have/had metal fuels lines coming up to the engine that overheat. sure enough, I can see metal lines coming up from the fuel filter. I'VE heard to replace them with Rubber, Obviously, for fuel. Before i go to the trouble, got other things to do on the old girl, wondered what else anyone else has heard, or known to repair the vapor lock issue. I heard it was a recall issue back in the later 80's. Comments?
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MTmtntinkeringagain (07-25-2016)
07-25-2016, 01:46 PM
#6
Junior Member
Thank you for the answer to my slightly DUR post. Realize NOW, of course, on my F150 302 Early 87 ignition control module is cracked, going out. After running her for a while, she'll either Not restart 5 out of 8x or when she does, runs for a while, sputters, dies, won't even try to kick over.ONLY on above 84 temp days. Have found a few diagrams that say 87 ONLY on them.
Ignition module not under Dist. so a searching we will go!!
Last edited by MTmtntinkeringagain; 07-25-2016 at 01:50 PM.