Cylinder 4 misfire

Asked by Mar 18, 2017 at 04:02 PM about the 2000 Ford F-150 XL 4WD SB

Question type: Maintenance & Repair

Why do I continue to have a cylinder 4 misfire after
3 different coil packs.

1 Answer

74,735

Then the coil pack is not the problem...Possible causes; Faulty spark plug 4, Clogged or faulty fuel injector 4, Faulty ignition coil 4, Fuel injector 4 harness is open or shorted, Fuel injector 4 circuit poor electrical connection, Ignition coil 4 harness is open or shorted, Ignition coil 4 circuit poor electrical connection, Insufficient cylinder 4 compression, Incorrect fuel pressure, Intake air leak.

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