1987 F-150 4.9L EFI, Auto Trans. Problem: Engine missis when warm like is is just failing and will eventually die if left at idle. Runs OK till it starts to warm up, about 5 minutes. I have replaced the fuel in tank pump, high pressure fuel pump, fuel filter and have checked fuel pressure regulator for fuel leaks and holding 20psi vacuum. Will check actual fuel pressure and operation today. Replace EEC relay, plug wires, plugs, rotor, cap, coil and TPS(comfirmed at 1.0v). Could it be the MAP or Oxygen sensor and finally does this truck have an IRCM or CCRM?
have the same problem?
Sunday, February 13th, 2011 AT 3:52 PM