Eco Engine miss with no codes. All rpms

[csorensen4124]

Hello all. First time poster, typical lurker. In need of help as I am at a loss. My wife owns a 2015 Lonestar with lvl2 weight loss that has an issue I just can't figure out. Started about 2 months ago. She was leaving a stop light when it all of a sudden started missing and stalling. She was able to start it multiple times to get out of the intersection and call me. It keeps missing and sometimes it sounds terrible like a real lean knock. Truck starts every time no issue but I can't figure out what is going on. First, we changed filter. It was ballooned a bit but intact. Changed it. Dropped tank to get clean fuel in, clean out and replaced lift pump since I was there. Had 2 injectors ohm low. Replaced those. Replaced the remainder while there. Nothing in fuel quality solenoid. Using alphaobd, fuel pressure looks good. Put weight reduction back on, factory tune...still no codes and same issue. Am I missing something....I thought for sure I should have a code somewhere!?!?

 

[Boone]

try crankshaft positioning sensor

 

[csorensen4124]

try crankshaft positioning sensor

Wouldn't it throw a code and put me into limp mode? Additionally, isn't it typically hard if not impossible to start? I am having zero hard start issues. The truck actually runs perfect for about the first 3-5 seconds, then the missing starts.

 

[Boone]

any chance fuel is contaminated. check fuel filter again and make sure no metal in it. sounds like something fuel related.
My problem turned out to be a bad new fuel filter. check fuel pump pressures with a scanner. Thats all I have. good luck

 

[csorensen4124]

I'm taking it to a shop to diagnose at this point. I'm just throwing money at it with no improvement. No metal shavings anywhere. Even checked the fuel quality solenoid. Fuel pressures are good, target and actual but fuel compensation rates are terrible. I replaced injectors and that wasn't it. It's definitely fuel related, but I don't know if it's driver, harness, or maybe just some gunk plugged up somewhere. The crazy part is no codes. So I'm at a loss

 

[Boone]

You can get a code scanner to monitor the fuel pressures while running and make sure you have correct pressures. I seen a couple of videos on Youtube last time I searched it. If it runs fine for 3-5 minutes that sounds like a fuel problem. There were several recalls on the fuel pump.
As far as the dealer my truck went into the shop 4 times before I figured it out by replacing the fuel filter. DX fees can be expensive luckily mine was under warranty.
They even pulled the transmission and replaced the crankshaft positioning sensor. See if there is a recall on the fuel pump.
Mine was a fuel problem and no codes either.

 

[Cali]

Did I miss if this is ecodiesel or not ? If yes , what year is it? the ecodiesel has recall on fuel pump.

 

[Boone]

https://static.nhtsa.gov/odi/rcl/2022/RCLRPT-22V406-1555.PDF

2014-2019 on this recall

 

[stellaram2018]

I am having the exact same issue on my 2018. Everything checks out fine, no codes, starts every time but stalls. Very interested in seeing what they can figure out for you