First off, I am new to the diesel world. I tried looking everywhere for a thread of a truck with the same symptoms, but wasn't able to find anything with exactly what I am experiencing. If this has been posted before, I apologize. Anyway, I bought a 2006 F250 6.0 a little over a week ago. It has 139k miles, and to my knowledge is stock with the exception of a 4" turbo back, and unfortunately a K&N CAI. As of now, it is used as my daily driver, not racing/towing. It will eventually be used to tow a horse trailer.
Well, I test drove the truck, had zero problems and ran great. The drive home from the dealer was 2 hours, again, no issues. Three or four days later, I noticed the engine and turbo "surging" I guess you could call it, at about 45 MPH, almost as if I was feathering the gas pedal in and out. The RPM's fluctuated about 250 down, then back up. Once I got up to about 55, it went away. It did this three or four more times, then at a stop light, it started idling pretty rough, enough to noticeably vibrate the whole truck. Once I accelerated, it went away and ran great the rest of the 30 or so minute drive. It will also "surge" when I floor it, almost every time.
Also, when accelerating from a dead stop, usually after idling for more than a minute or so, a little bit of black smoke will come out of the exhaust. I also feel a vibration in the gas pedal at around 1800-2000 RPM's. My last issue I am having, which I might be paranoid here, but I have a buddy with an 05 6.0, and sometimes the clicking of my glow plugs and my starter sounds sluggish compared to his.
Ive read that weak batteries can cause the FICM, I believe, make the truck run kind of rough. Is that accurate and is possibly what is causing this? I will get the batteries tested tomorrow, but I just wanted to hear any other possible causes of all of these symptoms. I checked the upper fuel filter, and it looked pretty good, as well as the bowl. I didn't see any grit/oil or particles. The oil level is good as well. I am in the middle of my second tank of running DieselKleen, in hopes that it was maybe bad fuel that had been sitting a while, it seems to be a little better, but could just be me convincing myself it will all be ok with an $8 bottle fix haha. I apologize for the long post, but any suggestions of what to check next or what it could be, would be greatly appreciated.
Im pretty sure this doesn't matter, but I would rather give too much info than not enough, it has a 6" lift and 35's.
Ok got the batteries tested. O'Reilly says both are bad, Auto Zone says theyre both good but the alternator failed. Id rather it be alternator, but who knows. It also threw P0336 crankshaft position sensor A circuit range/performance