Engine Performance problem
1995 Ford F150 V8 Four Wheel Drive Automatic 151000 miles
to begin last week I decided to put a new fuel filter in. After installed drove 30 miles engine started to cut out and buck and surge. Fuel filter that I had taken off had some black looking fuel on the pump side not the engine side. From there I changed cap, rotor, plugs, wires, air filter, still same bucking and surging, then proceded to check fuel pressure 35psi at idle on both tanks 40-45 at high rpm. Changed fuel pressure regulator still no change. Changed ignition controle module, no change. No check engine light. Tested for codes any how, no codes present, checked tempature sensor, tested within normal range. Changed fuel filter again, no change.
checked to make shure check engine light was working, works properly. Fuel pumps are new. Pulled spark plugs, shows signs of white burn pattern(mixture to lien). O2 sensor reads within proper voltages, no check engine light.
some times when parked for a while and when restarted it will run semi smooth for a couple minutes but will begin to shake like it is missing cylinders and then when drivin begin to buck and jerk. Im running out of ideas. I will replace coil pack next and maybe check mass air flow sensor and map sensor next and also check vacum pressure to see if I may have a vacum leak that I have not detected yet. Any input to this would help out im starting to go bald from pulling out my hair! Thank you
have the same problem?
Monday, April 21st, 2008 AT 1:54 AM