2004 F150 5.4. All four Coil packs on right bank are dead. Left side ar all fine. Truck running on left side only, so therefore, not running much. Why 1 side only dead?


Asked by May 05, 2014 at 10:23 AM about the 2004 Ford F-150 XL 4WD

Question type: Maintenance & Repair

What would cause all four coil packs to be dead on a Ford F150 5.4 engine.  Left bank is good, truck starts and runs, very poorly, cannot be driven.

7 Answers

Tracy Hooks

the Ford set-up is a little different in that the coils are supplied power all the time and the PCM provides Ground to fire them. It sounds like you have a wiring concern. The power circuit (Red/Light Green wire) supplies power down each bank of coils. It's the same feed and fuse so personally, I'd follow the loom back from the failed bank and see if there's physical damage to the wiring. A splice could have failed but it's more likely that the harness got damaged.

3 out of 3 people think this is helpful.

Thank you very much for your response. It does make sense. Now I have somewhere to start looking.

Tracy Hooks

You're welcome. Let us know what you find!


did you figure this out. i have the same problem. ive used a test light on the wires and when key is turned off they are both ground and with engine running on the bank of cylinders that still works the dead side of the engine has positive voltage to both wires into the coils. as does the working side. both wires give green light in test light with key off . red light when engine is running

Adrian Araujo

I got the same problem passenger side all 4 coils dead no power at all did you fine the Solution for your truck really need some help here


Has anybody figured the problem out yet

Tracy Hooks

You'll have to do some actual work to find it. Please see my original post.

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