Hi guys, I need some help. I'm getting an intermittent p0266 code, cylinder #2 contribution. It doesn't happen every day it mostly happens in the mornings when coming to a stop getting off the interstate. It happens just as I'm getting ready to stop, once i take off again it goes away and it usually doesn't do it again for a day or two. I looked at the harness to see if there isn't any chaffing but cant see anything wrong. Any ideas or suggestions are greatly appreciated. Thanks
Mine was a po266 on a 6.4l started out being a stuck injector which turned into a bad cylinder of some sort. Shop ran compression test yesterday was only getting 175 on #2 cylinder should be in neighborhood of 350+. my advise park it until you have the injector tested.
This ^^^. Your window between a simple injector replacement and cylinder damage can be short if the injector starts dumping. I had smoke once 150mi from home - smell and color inconclusive. Choice was head to a dealer or drive it home and do it myself. Chose the dealer. Dumping fuel but there was no cylinder damage. No regrets.
Somehow, I read smoke in there. Lol. Sorry 'bout that. Please disregard any undo concern.
If it's not the FICM connector, you can't find chafing, and the connector at the injector seems fine, getting a contribution/balance test would be the safe option. You can let that determine replacement.
What really confuses me is the fact that 99% of the time that it happens its only in the mornings. I have an injector from Ford now, its just a matter of tearing into it and see what I find. Yesterday I moved the harness around a little and checked the Ficm connectors and this morning it didn't do it. No code no hesitation. Nothing.
Got it, yes. You're not in a particularly cold area, but - depending upon your drive - the engine temp might be lower when it occurs.
I had a temperature-dependent short of my IPR signal wire. It would stumble or stall at almost exactly 120F. ...and, if I could get through the stall, it ran fine until it cooled down again.
It was fairly deep in the harness. You can read about it here:
I've read that thread multiples times now. Lol. The engine is completely up to temperature when it happens. When I take off again and clear the code it clears up, usually doesn't do it until the next day. I can feel it miss just as I'm coming to a complete stop and as I take off. It doesn't do it while driving at any speed or RPM.
Alright, I had the injector ready to be installed and talking to @LoxDiesel he suggested to look closely at the wiring for injector #2. Sure enough the problem was there. One of the wires had the insulation broken on it. It hasn't acted up since my last post. Thanks guys
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