1998 FORD F150 ENGINE MISFIRE PO303

  • Tiny
  • kingsburyfiso
  • 1998 Ford F-150

Engine Performance problem
1998 Ford F150 6 cyl Two Wheel Drive Manual 120000 miles

Have a PO303 reading on my scanner which is cylinder 3 misfire. Changed the plug, and put some electrode grease in the cable. Problem when away for about an hour. Now the Check engine light is on again, and it stutters when I accelerate. Once again aPO303 reading. Also get a small backfire at times, with a loss of power. (Recent work i've done ) Changed the fuel filter, oil, oil filter, plugs, cables, EGR valve, DPFE sensor, and the evr solenoid.

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Thursday, March 12th, 2009 AT 3:11 PM

1 Reply

  • Tiny
  • miamiii13
  • Member

At worst sounds like bad cylinder get a compression tester and check the cylinder @ best could be coil pak follow wire to coil pak and check for proper voltage if ok let me know. Get a book for your engine helps alot

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Thursday, March 12th, 2009 AT 10:47 PM

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