93 Ford E-150 5.0 Ltr 150k miles sputtering,shuts off?
Seems to run great until engine warmup, then intermittently just cuts out going along.Speed doesn't seem to change problem but it seems to recatch at higher speeds and keeps going without a total stall. At 25 mph or below usually will stall out completely and not restart. I have replaced the inline fuel filter but this didn't help.When I check ,always have pressure at fuel rail fitting . Fuel pump was replaced at about 80K miles. Does this 10% methanol crap fuel we are forced to buy now affect internal seals,parts,plastics, on fuel pump or injectors?
The thick film ignition module on the distributors are notorious for failure. Heat is what kills them over time. You need the tool mentioned to get it off, OR if you have your own tools you need a quarter inch drive ratchet and thin-wall 7/32 socket to remove the module. After you get it off clean the surface on the distributor and apply the new dielectric grease then insert the new module.
Now, simply replacing this module fixes the problem, but often times the pick-up module inside the distributor fails, too. The symptoms of a bad pick-up are the same as the thick film ignition module. Really, BOTH of these parts should be replaced at the same time. Getting to the pick-up requires removing the distributor from the motor and disassembling it shaft and all. If you're not mechanic savvy enough for this task then auto parts stores carry remanufactured distributors with both modules already installed. I've used remans for a lot of 302 and 351W street car projects so don't let anyone get it into your head to avoid using remanufactured distributors.
Make sure your distributor cap is in good shape, but as cheap as they are I'd get a new cap and rotor anyway. Be sure NOT to use the GP Sorensen brand of distributor caps sold at Advance Auto Parts and other store chains. They do not fit well. They remain loose even with the clips holding them down which would cause misfires. If your spark plug wires are old go ahead and install a new set and change your spark plugs. Heat causes the wires to deteriorate over time, too. Factory spark plug gap is .054
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