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Message: [QUOTE="Tweeder, post: 1547900, member: 32930"] I know, A misfiring 6.0 thread. Here's my issue, I can't seam to find any other thread that seams to be what's going on with my truck. I believe it may be a failing injector, however nothing is showing up in the system. So, here's the problem. When the air temperature and engine oil are cold (Under 180* engine, ambient air temp under 60*) my truck will misfire/surge at light throttle. occasionally i can feel a misfire at idle as well. truck warms, everything seams fine. The truck has also failed to start twice on me. Once in May, and the other time is just last week in September. Both times the engine was hot. So, here's the rub. Oil change: All new filters, all OEM. Fuel and oil Valvoline Premium Blue synthetic 5w-40 oil Last oil change I used Rev X This time, Hot Shot Secrets Forscan: No codes at all. NONE. Recent repairs: New ICP and pigtail New IPR and pigtail New glow plugs, harnesses, and glow plug control module Dealership replaced HPOP before purchase in April Both brand new batteries New alternator FICM: 48V all time Drops to 47v at start up 13.5v Logic never drops below 13v 13.5v vehicle power never drops below 13 ICP: 1.61v-1.77v at start up, settles in at .80v-.90v after idle established 1264psi at start up, 590-620psi at idle IPR: 42.97% at start up and settles in at 30% give or take at idle Mode 6 shows zero misfires. Driving or otherwise. Even when the misfire happens. PCM shows no misfires, shows no contribution codes, no fault codes at all. The only oddity is the fan speed. It's always flat. Shows 0.00% at all times, however it does show rpm on fan. I know the fan spins, because I can hear it, and see it. Could this be causing this issue?? Truck info: 2005 F250 192,000 miles Auto trans. NO performance mods, EGR cooler removed (Valve still in place), bone stock otherwise. No coolant loss, no oil loss, no smoke (except that diesel off idle black puff). I'm completely at a loss, I have no idea where to look from here. I can't imagine the fan could be causing a misfire like feeling? But maybe it's cycling on/off too randomly and putting a draw on the motor? If that's the case, it's just strange that it only happens when it's cold. I really don't want to start throwing money at it, but I'm not sure what else to do. I'm thinking about taking it to the dealership for an IDS scan, just not sure they'll find anything either. If I do take it to the dealership, I'm going to request a contribution test, and a high pressure oil system pressure test, but anything else I should ask for? What Might I be missing? The thing runs like a raped ape otherwise, so I'm completely lost. [/QUOTE]