Cylinder four misfire

Tiny
ELKMAN14
  • MEMBER
  • 2014 FORD F-150
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 137,000 MILES
Engine light went on, had checked and was told cylinder four misfire. Changed plugs and coils, engine light went off for day. Went back on next day. Disconnected battery and checked all wires and had test done, number four misfire again. Went off for day, then back on. Had code reset. Went day with it off and then next day back on. Checked plug, no burning or fouling, changed coil with old coil. Added four cans of b-12 chemtool thinking maybe injector. Went hunting next day driving 400 miles round trip, start and stop a lot. Used 4wd a lot. Engine light never came back on that day. Next morning started and light on again. I have had no power loss, very minimal missing, usually only when started and idling in morning. Runs good up hill and towing a pop up camper. No power or speed loss. My truck listed above is the XL model. Thanks
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Thursday, November 8th, 2018 AT 11:09 AM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon.

It does sound like an injector that may have an irregular spray pattern causing the misfire.

I would try moving the injector to another cylinder and see if the misfire travels with it. That will confirm it is an injector.

Roy

Possibilities below

P0304
Descriptor
Cylinder 4 Misfire Detected
Probable Causes
Engine Mechanical Malfunction
Evaporative Emissions (EVAP) System Malfunction
Evaporative Emissions (EVAP) System Purge Valve
Exhaust Gas Recirculation (EGR) System
Fuel Injector 4
Fuel Pressure Incorrect
Ignition System Malfunction
Misfire Monitor Neutral Profile Correction Has Not Been Relearned Since Last Repair
Vehicle Running Out of Fuel
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Thursday, November 8th, 2018 AT 12:57 PM

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