Question about 1993 Ford F250

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High external temperature causes engine to die

I have a 1993 f250 with a fuel injected 351 and a 5 speed and headers. I recently moved to Las Vegas from Oregon. My truck runs fine in the mornings or when the temperature drops but during the day (when temperature reaches 107 or above) when it has been on a long run (usually worse in stop and go traffic) it begins to stumble. It will randomly drop 500 rpm during idle, then later it won't idle. I'll try to keep it running by feathering the gas pedal but eventually you can't and it will die. It is extremely difficult to restart. I recently discovered that sometimes it will start up just like nothing ever happened when I switch fuel tanks. I had it checked out and they said that the fuel pump was failing. They said that the fuel pressure started to drop and the pump wasn't running. The problem with that theory is that it does the same thing on both pumps and tanks no matter which one I start with. That tells me it's something shared by the two. I wrapped the fuel lines with heat tape in case of vapor lock. It has caused my spark plugs to go bad in cylinder 7 and 8. It will also back fire under the hood when I feather the gas.

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Sounds like your ECT (engine coolant temp.) sensor has gone bad. What happens is when the truck is cold, the ECT acts like a choke on a carb. When the truck gets to operating temperature, the ECT tells the computer that it doesn't need the little extra fuel anymore. What's happening with your is the ECT isn't telling the computer that the engine is at operating temp. It's acting like the choke on the carb. is stuck shut. The computer is being told the engine temp is at 40 below still.

Posted on Aug 23, 2008

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