Question about Cars & Trucks
If it only dies when hot it could be coil related. Sometimes after they get hot if they are bad they will lose spark.After it dies check to see if you are getting spark to your plugs.
Posted on Jan 08, 2013
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Posted on Jan 02, 2017
It sounds like it could be the transfer pump. Turn the key on and then crank the engine for about 1 second but leave the key in the run position and listen for the transfer pump to run. It should run for about 15 seconds after you stop cranking. If not, then you will need to replace the transfer pump with a in-the-tank conversion kit if your is mounted on the side of the engine block below the fuel filter housing. If you already have the in-the-tank pump then it might be siezed or the "sock" might be plugged up with alge or other contaminants. I usually lift the bed rather than removing the tank to replace the fuel module. If the check engine light is on you might want to have it scanned for codes to make sure since the modules can be spendy.
Posted on Jun 05, 2009
SOURCE: 91 F150 runs rough at low idle
If you put a scanner on it and you have no misfire codes I would be looking at either an egr valve stuck open a little or a bad Idle Air Control Valve
Posted on Aug 06, 2009
only half way there if you have a tbi check the crank sensor/ cam sensor that is the first line of business on that truck if the crankshaft sensor fails the truck stops dead when you wait a few minutes the sensor re energizes and the truck will work again for a bit antiknock can cause similer problems but not while the truck is running
Posted on Feb 24, 2010
Check the coil for a white ash look any where on the coil. This is an indication that there is a crack in the case and its firing thru it. this can cause that problem. one other is the pick up coil in the distributor. these will not show anything. theres no way to check because when they are cool, they will test fine, but when there hot they just die. when they cool down , they work again
Posted on Jun 18, 2010
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