[FordDoctor]

 

[jakewissell90]

was this ever resolved? I also have 200psi Koeo but I have a crank no start. chasing problem now. I also just installed the spa disaster kit

 

[Vile_Joker]

I hate to say, but not really. I put a tank of Rislone Diesel DPF Clean Exhaust cleaner through the system and it went away. I didn't end up changing anything out at all. It's been fine ever since. I have been running a tank of it once every month since then. So I am assuming it was a sensor? Shrugs

 

[FordDoctor]

Let's hear it for liquid mechanic! Hey, if it works...

 

[Vile_Joker]

Let's hear it for liquid mechanic! Hey, if it works...

View attachment 813515

Well, the main problem is that I have no idea what the previous owner did for proper maintenance on this truck, so I'm shooting in the dark on these things. I figured I would try the lease expensive option first and then work my way down the line. Based on the fact that there was never a loss of power or any stuttering or any idling issues or anything like that, the engine never seemed to be starved for fuel at all when the pressure dropped. It had, literally, no other signs f an actual fuel problem. So I figured I'd start off light and if that didn't work, then progress to the next step.

And from what I saw inside the throttle manifold when I had to replace the cold side charge tube, it's not entirely great in there. I am going to have to take it to a mechanic and have them clean out all the soot build up from inside the entire intake and EGR cooler if my eyes did not deceive me. It was thick black crap inside there.

 

[FordDoctor]

The carbon build up is normal. Unless it becomes extreme it's typically not an issue but then you have to determine why it's so excessive. Scaping and cleaning the lower intake is fine and I have done this many times... typically when installing a new service engine so I often wonder if, in the worst examples, the valve covers also need to be removed and cleaned. Usually the heaviest build up is in the throttle plate and EGR inlet area so cleaning that is probably enough. Even if it's not causing any performance concerns cleaning it certainly won't hurt. Mitigate it using a good fuel conditioner (for cetane) and limit idle time if you idle a lot. I do not see many EGR cooler face plugging or restriction concerns any more. That seems to have been a problem on the earlier model year production engines.

 

[Vile_Joker]

The carbon build up is normal. Unless it becomes extreme it's typically not an issue but then you have to determine why it's so excessive. Scaping and cleaning the lower intake is fine and I have done this many times... typically when installing a new service engine so I often wonder if, in the worst examples, the valve covers also need to be removed and cleaned. Usually the heaviest build up is in the throttle plate and EGR inlet area so cleaning that is probably enough. Even if it's not causing any performance concerns cleaning it certainly won't hurt. Mitigate it using a good fuel conditioner (for cetane) and limit idle time if you idle a lot. I do not see many EGR cooler face plugging or restriction concerns any more. That seems to have been a problem on the earlier model year production engines.

Ok. I f I get a chance, I'll try to toss up a picture of it. The cold air charge pipe pops off easy enough and I can snap a shot of the throttle. It doesn't seem to effect engine performance, but I worry that something may dislodge and head pistonward. I run fuel conditioner/lubricity additive with cetane each fuel tank for the truck. I'm overly paranoid about CP4 failure and I have not had a chance to install a "disaster prevention kit" yet.

 

[olypopper]

Ok. I f I get a chance, I'll try to toss up a picture of it. The cold air charge pipe pops off easy enough and I can snap a shot of the throttle. It doesn't seem to effect engine performance, but I worry that something may dislodge and head pistonward. I run fuel conditioner/lubricity additive with cetane each fuel tank for the truck. I'm overly paranoid about CP4 failure and I have not had a chance to install a "disaster prevention kit" yet.

Well the good news is when a CP4.2 poos itself......they don't heal themselves. Curious if you've ever pulled the fuel quantity solenoid and inspected the screen or not.

 

[K9kodi]

Last few months I’ve been chasing a low rail pressure code following an engine light. If I drove like a grandpa on flat ground I never saw the light or had an issue. If I was pulling a trailer and cruise control downshifted demanded more fuel, light popped. If I went past half throttle as an example, light popped.

First thing I did was swap filters and look for glitter. None.

I then replaced the fuel rail pressure sensor above drivers wheel and nothing changed.

Being in denial about it being the cp4 I just drove like a grandpa. I had my buddies shop hook it up to their scan tools and drive it. He said it wasn’t meeting the threshold for rail pressure when it was demanded. He said my cp4 was failing. I ordered a dcr and he installed it. Found some wear in the cp4, but not where I hear people talk about it.

Truck runs so much better now. It’s deleted and I can feel power diff and response diff in each tune.
I think the cp4 was failing somehow over time and the power was just sneaking away as to not notice it.

 

[olypopper]

Last few months I’ve been chasing a low rail pressure code following an engine light. If I drove like a grandpa on flat ground I never saw the light or had an issue. If I was pulling a trailer and cruise control downshifted demanded more fuel, light popped. If I went past half throttle as an example, light popped.

First thing I did was swap filters and look for glitter. None.

I then replaced the fuel rail pressure sensor above drivers wheel and nothing changed.

Being in denial about it being the cp4 I just drove like a grandpa. I had my buddies shop hook it up to their scan tools and drive it. He said it wasn’t meeting the threshold for rail pressure when it was demanded. He said my cp4 was failing. I ordered a dcr and he installed it. Found some wear in the cp4, but not where I hear people talk about it.

Truck runs so much better now. It’s deleted and I can feel power diff and response diff in each tune.
I think the cp4 was failing somehow over time and the power was just sneaking away as to not notice it.

A failing CP4..............who woulda thunk!

 

[K9kodi]

Oh I thought. I didn’t wanna believe it.

 

[olypopper]

Oh I thought. I didn’t wanna believe it.

Believe it. They're happening more and more. Hopefully Ford does something about it besides blame customers like they've been really good at.

 

[K9kodi]

Do you usually see the good in people too, like when they eff you over you come up with an excuse then on why they did it? Cause that’s what ford is doing but only relative to rams recall and fix. Ford said they would reprogram a couple years for cooler fuel temps? Really. Hahaha. I’ll own another one, but def with a warranty

 

[olypopper]

Do you usually see the good in people too, like when they eff you over you come up with an excuse then on why they did it? Cause that’s what ford is doing but only relative to rams recall and fix. Ford said they would reprogram a couple years for cooler fuel temps? Really. Hahaha. I’ll own another one, but def with a warranty

From my last 30+ years of truck ownership I've watched how Ford takes care of diesel warranty and I'm not impressed. Ram has done a much better job.......considering my Ecodiesel and the fact it has the CP4.2 pump also, Chrysler recalled the pumps. They still installed another CP4.2 but the new ones are pinned to prevent plungers from spinning. Why in the hell isn't Ford doing this???? I know they are the masters of the bean counters but this one is ridiculous considering the failure potential. Instead of updating current production they double down and blame the customer. Silly.

 

[K9kodi]

Yes when I saw ram using a new cp8 n ford doubling down on cp4 I believe there is more to it. Maybe they bought so many units or a promise to buy xxx amount in order to maintain a certain price or they simply don’t feel they can admit there is a problem bc then they’d be in a world of financial hurt.
I think ram did it bc a few bucks now keeps them from going under later.

Unfortunately I think ford can survive a span of people not buying one product line for a time period, where I think if stellantis lost sales of the 2500-2500-350-5500 they’d have a very good chance of going under. They don’t have much to offer other then wranglers and rams

 

[Carvm30]

Anymore updates vile? I’m dealing with the same issue. Only difference is I have S&b sending unit and air dog lift pump. Both were replaced and problem has been gone for a few months and now it’s back giving me the same low fuel pressure warning. I read in another forum that the fuel relay wiring could be going bad which would cause a no start which was the original problem. But now the truck runs and gives the warning

 

[Whooosh_2013xlt]

Hello,

2019 F350 Lariat 6.7l Power Stroke. 193k miles.

I have tried searching through the forums for similar threads to this and have found a couple that are close, but nothing quite matches what I have going on and I am wanting to see if I can get any insight on my situation.

I have not owned this truck for an incredibly long time. I purchased it with a little over 170K miles on it. The previous owner has good maintenance records for it.

Just over the last week I have had issues with the Low Fuel Pressure warning light coming on. Always at lower RPMs or at an idle. I have checked for fault codes every time that it has come up and there is nothing on the system for fault codes at all. I have the Torq app and have run several logs while driving to keep an eye on things, but to be quite frank, I am not entirely sure what I am looking at. I am not sure that the pressure is supposed to be. There are a couple times at idle or low RPM that the fuel rail pressure dropped below just under 200PSI, but that is the lowest that I have seen. I can provide a link to the CSV files if anyone would like to take a look at them.

The truck doesn't feel like it has lost any power and it sounds the same as it always has. I changed out both of the fuel filters about 10k miles ago, so I was thinking that might be the culprit, but I thought those filters were supposed to be good for 15k miles.

I am not sure where the fuel pressure sensor would be at to change it, either. Does anyone have a part number so I can look it up?

Any insight would be greatly appreciated.

Thank you very much!
Joker

As crazy as this sounds, I had a similar issue to this. I couldn't figure it out, so I finally took it to the dealership. They diagnosed a bad ground between the block and the body ground. There's a dedicated ground strap for this. I ordered a new (like new used strap), installed it and I'm now getting 30k lbs of fuel pressure and never seen the error again! I have a tune and Def delete. Hope it helps!