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?
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.
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.
Thank you very much for your response. It does make sense. Now I have somewhere to start looking.
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
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
You'll have to do some actual work to find it. Please see my original post.
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