Hey FTE,

Im back to pick your brains once again! Heres what I got goin on:

2015 F350 XL 6.7L 308K mi (Tuned/Deleted)

I just installed the SPE Dis. Prev. Kit about 3 weeks ago and havent got the truck to run right since.

The truck will fire right up, idle for all of about 2 seconds just fine, and then die. It throws the code P0183 (Fuel Temp Sensor A circuit too high)

Now this is where it gets interesting; if you unplug the Fuel Temp Sensor, she will fire up and idle but after about 5 sec. an odd “rattling” noise comes from the engine at which point the fuel pressure spikes from ~4.3K to ~12K psi (for a SPLIT second) and back down to ~4.3K psi. In that split second, the ever famous Reduced engine power warning and throws the truck into limp mode. But now I get a low fuel pressure warning AND a P0087 code because that sensor is unplugged.

Low Pressure Fuel Pump puts out 88psi
Fuel Filters changed 2000 mi ago
Fuel Pressure Regulator: New
MPROP: Came out of a problem free 6.7
Fuel Temp/Low Pressure Fuel Sensor: New

This 6.7 is probably one of the more high mileage ones on the road, but the original CP4/fuel system has been problem free until I decided to add the kit to it. And yes, my mprop was spotless when I pulled it out to do the install.

It is going into Ford tomorrow, but I want to go in there with all my bases covered.

Any ideas or suggestions fellas?

 

Being that this will most definitely happen to somebody else down the road, I will update yall tomorrow with the verdict from Ford

 

Just be sure the somebody at Ford knows what they are dealing with (tuned and deleted) or you could lose your tune when they plug their computer in.

 

Ah, thank you for that. Didn’t even occur to me

 

Does anyone know if there is a wire or wire bundle that could have been pinched?

the temp sensor error is a new twist from your last thread.

before spending big Ford stealership money on this, why not roll it back and remove the spe DPK? If the problems remain, it eliminates the spe DPK. Also, going back in with everything removed will let you inspect elictrical that would be hard to see with manifold installed.

 

Why do you have a used MPROP?

 

Bitterroot:

It was an act of desperation; and it came off a truck with no issues, 1 year newer, and 140K less miles. Figured it couldnt hurt

Fritz:

Yeah I think removing the kit will be my next step. That was also Fords recommendation. I dont think there are any pinched wires. But Ford says theres seems to be nothing wrong with any of the fuel pressures, they are all where they should be. Im going to try replacing the fuel temp sensor with a motorcraft one and not the “oem equipment” from oreillys and see if thats whats causing the problem.

Funny how NO Ford diesel tech in West TN has ever heard of a DPK before....

 

Parts from the parts store should typically only be used in emergencies only.

 

I did a DPK about a month ago

recently started smelling diesel exhaust fumes

check for codes and got “ egr at max flow”! Error

dwcided to disassemble to investigate

pulled the plastic top section

saw soot on the rear of the egr tubes

reassembled from back to front


cleared the cod


all is good now

so I recommend you roll back the DPK to see if the problem is the environment or the DPK.

 

Well Fritz, thatll probably be my next step if the motorcraft fuel temp sensor isnt the solution. However, I seem to have misplaced the plastic line coming off the secondary filter to the rail, looks like I will be needing one of those first

 

I'm impressed with the mileage and original HPFP. You buy it new? Additives at all?

The primary pump (DFCM) is good as I see a high of 86 PSI on my iDash. Good luck with this.

 

No I bought it used a few years back. No additives, just fuel filter changes every other oil change and I try to only use truck stop fuel.

And thank you, I will keep yall updated with the outcome

 

Well fellas heres the update:

Took off the DPK and got the same P0088 code and REP. So I am ruling out the kit as the cause and Chance from SPE assures me that that code is not a byproduct of the kit.

Decided to put the kit back on, except with a new MPROP this time. Now the truck runs great as long as the rail pressure stays below about 20K. But if you hit anything above that, she throws the REP warning and dies...

Thoughts? Advice?

Im pretty much come to terms with the pump being the culprit but I definitely need to know for sure before spending $1000 and a day putting it in...

 

I am currently having the exact same issue but with a XDP kit. Mine is going back to the mechanic today to see if he can figure it out. Everything was great, no issues @ 185k miles prior to putting the DPK on.

 

Folks, depending on the DPK gen1 kits used, there have been cases of fuel pressure problems associated with the oring used on the actual by pass manifold used in the metering valve socket. There are basically two types of oring architectures…one uses a star looking plastic holder, these seem to be problem free…the other uses no holder and it’s just an oring. For the later…there have been cases of the wrong size oring provided…..the pressure problems occur becuase of air being sucked in at this juncture.

Not applicable if you removed the DPK and still have a fuel presssure problem.