Complete newbie here (both to the forum and to the diesel market). I am fairly technically inclined, and can hold my own on all of the regular maintenance, and can at least know what I'm talking about and looking at with some more advanced things. To be completely honest, though, I'm still scared sh**less of messing around with the diesel engine too much.
About 15,000 miles ago, I picked up a 2004 F350 with the 6.0 (now with 209,000 miles). It's been an incredible learning experience, and despite all of the problems I've encountered and the money I've put into it, I've loved owning the truck. However, I've come across a bit of a problem that I need to ask your help with...
A little while ago, my truck started doing this weird thing where it will violently shake after shifting and trying to accelerate in the range of about 45 to 55 MPH. When I let the truck shift down, and have the RPM drop slightly, the truck will very violently shake when I hit the accelerator after. If I really push it to the floor, it will hesitantly kick the RPMs high and it won't happen. Oddly enough, if I put the truck into Tow/Haul mode around 45 MPH when it starts to happen, it will be perfectly fine. If I try to put it into Tow/Haul around 55 MPH when it happens, it will still happen as "normally."
I decided to buy an OBD2 scanner and connect it to the Torque Pro app to go ahead and get some insight as to what the problem might be. Upon reading the codes and monitoring the real time data while driving, I haven't been able to come up with much. When the problems occur, there are no misfires, the FICM
voltages seem to be around normal, and I can't find anything on the app to show that the truck is operating poorly. I have gone ahead and attached screenshots from the app to this post with the data that I think could be relevant for you guys to see. I have included the fault codes that the scanner read, as well as a few different screenshots from monitoring the real time data while driving. The FICM
voltage could drop as low as 46 or 46.5 while driving (without the problem occurring) but the images attached represent what it was most of the time.
My guess is that it is some sort of injector problem, but I don't know if this is a symptom of a faulty injector, and I'd really hate to drop the money on replacing those if that's not the problem. I'm a little scared it could be a tranny problem due to it happening upon shifting and Tow/Haul mode helping it in certain situations. But I'm a little scared to even consider that, to be honest.
I apologize for the long post, but I'm really hoping to get this resolved so wanted to give you guys the information that I had! Please let me know if there is any other information that I should go ahead and look into. Thank you all for the help, I've been reading this forum since I purchased the truck.