This is cross posted because I need all the help I can get. I'm brand new to the forum, as I just traded my F150 for a 2008 F350 KR with the 6.4 while visiting family in Texas. It is in like new condition, with 230k on the ticker. When I made the deal, the DPF was in the bed of the truck and a tuner (bulldog maybe) was hooked up. When I picked it up, the DPF had been reinstalled and there was no tuner. Not happy about it, but not mad enough to walk away. On the way home yesterday outside Sherman, TX I got the pull over safely and a CEL caused by 2 DTCs: P0200E catalyst system over temp P0128 coolant temp below regulating temp. Today, 1000 miles later driving from New Mexico back home to the denver area, I was doing 75 up a hill on E470 and I noticed a marked loss of power, indicated turbo PSI of 0 and more, but not excessive black smoke. I pulled over, and as I did so, was advised to PULL OVER SAFELY then the truck shut down with the same DTCs, although the P0128 is only pending, not stored. I said screw it and am waiting for a tow truck, and am trying to get a plan of attack before I get the truck home. I appreciate any queations, ideas, comments, death threats etc. Other than take it to a real mechanic, because I am: 1)poor white trash 2)a better mechanic than 90% of those I have been to 3)as a recent transplany, not within towing distance of one of the 10% I would trust Thanks in advance!!

 

Welcome to FTE, wish you found us while under better circumstances. Unfortunately, what you've described could be a whole lot of things. The delete should've been in the garbage can when you left the dealer.

 

if it were me and I was buying that truck I would have had the dealer keep the tuner or what ever, but that is aside the point, sounds to me like a DPF?? (can't remember what) issue, I do remember reading about similar issues involving the DPF and I think EGR having something to do with this, sorry I can't be much more help, I typically am in the 7.3 area as I have an E99 truck so I will differ to the more experienced folks that should be chiming in shortly.

I am also thinking the dealer might have (it is possible) done something during the reinstall process of the DPF, do you know if they were a Diesel shop? most places that work on gas cars have little to no knowledge about diesels as that is not what they typically service so they have no need to invest in the training or equipment required for doing a proper job, im woundering if this may be a similar case...

 

Moved to the 6.4L forum...

 

Not sure if it was here and for some reason my post got deleted or if it was on ps.org but I know I replied to this. Here goes again though.

First thing is first, you most likely have an egt sensor in the exhaust that has gone bad. OR it was left unplugged when they reinstalled the exhaust. There are 4 total sensors. One before the turbo, one before the dpf, one at the dpf, and one after the dpf. If they are all plugged in (you would have other soft codes if they weren't plugged in) you need to watch all of the egt sensors. The best thing to do is when the exhaust is cold see if any read high. You will usually have 3 reading ambient temp and 1 that is like 500*. This can also be fixed by deleting and it sounds you already know that's the best route to take with a 6.4.

As for the coolant temp dtc, it could be a combination of things. First things first, you need to get the truck fully up to temp and watch both coolant temp and oil temp on a monitor. Get on the freeway and set cruise at 65 for a good few miles. You are looking for oil to sit between 194-200* and coolant should be roughly 3-5* cooler than the oil. If the spread (delta) is more than 15* you have a clogged oil cooler. Many times its a combination of bad tstat and an oil cooler. In order to figure out what it is you will need a monitor though.

Now, for the part you don't want to hear. If you don't have access to a lift to pull the cab that oil cooler repair is going to be one of the most annoying things you have ever done as a mechanic. The turbos and intake mani are going to need to be removed for you to gain access to the oil cooler. You really do not want to attempt this without at least tilting the cab. Once the cab is out of the way its very straight forward and simple.

But you need to start with the egt sensors in the exhaust. The truck will keep going into limp mode and leaving you stranded until you solve that problem. That kinda makes diag a bit hard lol. Keep in mind the dpf could be clogged as well, this will cause it to overheat. In either case your best option really is to delete.