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Hey everyone, my 04 excursion has been idling very rough at stops, and now all of a sudden it shutters really hard at around 50mph. I hooked up my computer and got ALL these codes, please help me start somewhere!!
P0269
P0275
P0341
P0401
P0671
P0674
P0675
P0676
P1260
Looks like 2 injectors and 3 glowplugs and/or glow plug circuits. I'd check the FICM to insure proper cold and/or starting voltage along with load testing the batteries (separately/unhooked).
I'd address the glow plugs while I had the valve covers off doing injectors. The circuits and plugs can be tested with a DVOM. I'm wondering also if one of the CB codes is caused from a rough cold start, but still sounds like an injector when it's hot/running.
Regardless, it will take a little detective work to narrow down your problem.
What is the P1260 all about (P1260 Theft Detected, Vehicle Immobilized) ?? This code is only thrown when the PCM sees an incorrect signal or no signal at all from the chipped key.
+1 on load testing batteries.
You had a previous post on a chipped key, but it looks like that was on an 04 F350 DRW. Are you using an aftermarket "chipped key"?