Hello all, I am at my wits end with this truck. Today, we put the computer to work on it. Four times, four, same result every time. No codes, no coil pak, no plugs, no injectors, no dead holes, no ignition issues. I had a transmission circuit switch show twice, and a driver side window circuit. Please, if anyone can give me vague glimmer of hope, I would greatly appreciate it.

 

No misfire code is generated unless the mifire occures some number of times in a row. A dealer has a proprietary diagnostic tool that will find a defective coil, otherwise buy one coil and replace one coil at a time rotating the known good coils.

Brad

 

I have tried that, but I did not go through all coils one at a time. Found OEM coils on wrecked unit, five bucks each. problem is, it misfire all the time, so the OBD 2 should have picked it up.

 

And ... "this truck" IS?

HINT/TIP: Put your vehicle information (year, model, cab, trim, engine, wheelbase, _x4 drive, mileage, etc., etc., etc.) in your signature -OR- provide it in your posting(s).

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98 F150 XLT with 5.4 Triton. 4X4, Extended Cab, with third door, and short bed. All electric: etc.

 

No guarantee that all of the used coils you bought are good.
While it seems a cylinder is misfiring continuously, it isn't always so IME 3X. A bad spark plug or an injector are more likely to illuminate the CEL. A friend of mine (Ford mechanic) actually had a customer with two defective coils once.

Brad