Persistent Fuelling Problems with BMW 116D Assistance Required :(

[IrvesBMW]

Greetings everyone,

I sincerely apologise if I am violating any regulations. This is my first experience on any forum, so I appreciate your patience.


Initially, these are my specifications:

BMW F20 116D 2.0 Diesel Decat / DPF Removal (Downpipe; the original DPF is still available)
EGR Deletion (Software and Blocked)
Stage 1 Tuning Short Ram Air Intake Enhanced Intercooler

I am seeking advice or insights about my BMW. I am repeatedly seeing the problem code: 247500 Rail Pressure Plausibility, Quantity-Controlled. Positive Control Deviation: Insufficient Rail Pressure.

This issue arose during an enthusiastic drive when I passed another vehicle and thereafter had a complete loss of power. Notably, no drive-train issues were shown, and the vehicle entered a limp mode. This incident occurred around three months ago. At that juncture, my BMW emitted black smoke from the exhaust at wide open throttle, and upon reaching elevated speeds, a drivetrain fault would occur, resulting in limp mode activation. This is perplexing, as black smoke typically signifies over-fueling, yet ISTA codes indicate insufficient fuel supply.

I already examined the forums and discovered that another user had a same problem, which was attributed to a defective remap. In my situation, all modifications and enhancements were finalised over a year ago with few complications.

Regardless, after perusing that thread, I resolved to revert my vehicle to its original configuration, reinstating the DPF and EGR, removing the remap, and reintroducing the original airbox and intercooler; however, I had no success.

I consulted a local mechanic who originally diagnosed the issue as the MAF sensor, which we changed without success. He conducted testing and saw that the High-Pressure Fuel Pump (HPFP) exhibited decreased pressure. Subsequently, I reluctantly replaced it with a new unit; nonetheless, the issue continued. He considered that the problems may stem from the fuel rail and injectors; so, I replaced the common rail and all the injectors. The common rail was new, but as expenses accumulated, I chose to get reconditioned and tested injectors. Once again, the same issue. We then considered the possibility of a failed turbocharger, so he removed it; nevertheless, the turbocharger was in good condition.

I am now at an impasse, both financially and emotionally; I have an affection for this automobile, however I am experiencing the sunk cost fallacy. I am open to any suggestions you nice people may provide; else, I will regrettably have to relinquish it.

I apologise if I have violated any regulations and would really appreciate any assistance.

[PixelMaster]

Has the gasoline filter been substituted, and has the low-pressure pump been inspected or replaced?

[IrvesBMW]

Thank you for your response, PixelMaster.
Apologies for the oversight; the fuel filter has been replaced in conjunction with the air filter for the standard air box. Additionally, I neglected to note that the charge pipes have been inspected and are functioning well, with no splits present. The low-pressure pump has been inspected and is functioning properly.

[ChatMaven]

Hello, have you determined the nature of the issue?

[IrvesBMW]

I have just seen an email from bimmerforums today. Regrettably, I spent excessive funds without achieving accomplishment, leading to my decision to desist.

Thank you

[Matt865]

The original poster seems to have not returned to the forum.

[Matt865]

😇😉