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.

2 Answers

87,365

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.

2 people found this helpful.

I've has the same problem, two coil packs, one injector, three spark plugs. Ended up being a dirty fuel filter (believe it or not). If you look at the fuel rail on the entire 4.6 motor, the line make a strange little turn to go to #4 Injector. I'm guessing that #4 has the most restricted path for fuel. As soon as I changed the filter the truck ran like a Swiss Watch. (If you look above, incorrect fuel pressure, was the problem, but it just effected #4 cylinder first.

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