Chasing a phantom misfire on a 6.7 for 6 hours turned out to be a pinched wire

Reese Perez · 2026-09-07T05:25:04.747376+00:00

I spent a whole afternoon swapping injectors and checking compression on a 6.7 Powerstroke only to find a chafed harness wire under the intake manifold. Truck ran rough at idle but cleared out at speed, which had me chasing fuel pressure and nozzles. Anyone else ever had a harness rub that took forever to pin down?

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Chasing a phantom misfire on a 6.7 for 6 hours turned out to be a pinched wire | Diesel Mechanics - Chatter Central