[JB2]

Looking for some advice from my fellow N55 friends…

Experiencing multiple cylinder misfires and fuel codes - any insight on the most-likely root issue would be much appreciated.

2012 N55 135i M-Sport

Symptoms:

- long start
- rough idle
- white smoke from exhaust
- sometimes engine barely runs
- onboard computer shows fuel pump error but LPFP and HPFP have both been replaced

Codes:

- 2C90 Blow-Off valve mechanics -- Ignore, tuner code
- 2EFE Combustion misfires, several cylinders detected
- 2F03 Cylinder 5 Misfire Detected
- 2EE0 Combustion misfiring, several cylinders, fuel injection deactivation*
- 2EF1 Combustion misfiring, cylinder 5: Fuel injection deactivation
- 2F00 Cylinder 2 Misfire Detected
- 2EE7 Combustion misfiring, cylinder 2: Fuel injection deactivation
- 2F04 Cylinder 6 misfire
- 2EF4 Combustion misfiring, cylinder 6: Fuel injection deactivation
- 2F02 Cylinder 4 misfire
- 2EED Combustion misfiring, cylinder 4: Fuel injection deactivation
- 2C01 High pressure fuel system, fuel pressure: Minimum pressure undershot
- 2BF5 Rail pressure sensor, plausibility: Minimum pressure undershot
- 2EE2 Combustion misfiring, several cylinders: damaging exhaust gas after start sequence
- 2EF3 Combustion misfiring, cylinder 5: damaging exhaust gas after start sequence
- 2EF6 Combustion misfiring, cylinder 6: damaging exhaust gas after start sequence

Recent Changes:

- Replaced LPFP with Fuel-It Stage 2 LPFP
- Replace HPFP with OEM Remanufactured

Relevant Mods:

- BMS JB4
- BMS Cold Air Intake
- Evolution Racewerks Charge Pipe
- Fuel-It Stage 2 Low Pressure Fuel Pump
- DV+ Performance Diverter Valve
- NGK 5992 / 95770 1-Step Colder Plugs

Logs from today attached.

I am pretty new to this, so any help is greatly appreciated. Thank you!

[JuniorB]

Looks like the ecu is under attack, don't change anymore parts until you can confirm the mosfets are not fried. The erratic misfiring is a dead giveaway.

[ERIKGARCIA]

Originally Posted by JB2

Looking for some advice from my fellow N55 friends…

Experiencing multiple cylinder misfires and fuel codes - any insight on the most-likely root issue would be much appreciated.

2012 N55 135i M-Sport

Symptoms:

- long start
- rough idle
- white smoke from exhaust
- sometimes engine barely runs
- onboard computer shows fuel pump error but LPFP and HPFP have both been replaced

Codes:

- 2C90 Blow-Off valve mechanics -- Ignore, tuner code
- 2EFE Combustion misfires, several cylinders detected
- 2F03 Cylinder 5 Misfire Detected
- 2EE0 Combustion misfiring, several cylinders, fuel injection deactivation*
- 2EF1 Combustion misfiring, cylinder 5: Fuel injection deactivation
- 2F00 Cylinder 2 Misfire Detected
- 2EE7 Combustion misfiring, cylinder 2: Fuel injection deactivation
- 2F04 Cylinder 6 misfire
- 2EF4 Combustion misfiring, cylinder 6: Fuel injection deactivation
- 2F02 Cylinder 4 misfire
- 2EED Combustion misfiring, cylinder 4: Fuel injection deactivation
- 2C01 High pressure fuel system, fuel pressure: Minimum pressure undershot
- 2BF5 Rail pressure sensor, plausibility: Minimum pressure undershot
- 2EE2 Combustion misfiring, several cylinders: damaging exhaust gas after start sequence
- 2EF3 Combustion misfiring, cylinder 5: damaging exhaust gas after start sequence
- 2EF6 Combustion misfiring, cylinder 6: damaging exhaust gas after start sequence

Recent Changes:

- Replaced LPFP with Fuel-It Stage 2 LPFP
- Replace HPFP with OEM Remanufactured

Relevant Mods:

- BMS JB4
- BMS Cold Air Intake
- Evolution Racewerks Charge Pipe
- Fuel-It Stage 2 Low Pressure Fuel Pump
- DV+ Performance Diverter Valve
- NGK 5992 / 95770 1-Step Colder Plugs

Logs from today attached.

I am pretty new to this, so any help is greatly appreciated. Thank you!

I do not see pressure from LPFP

[Dave @ BMS/Fuel-It!]

Originally Posted by ERIKGARCIA

I do not see pressure from LPFP

No LPFP sensor

[JB2]

I replaced the Fuel Pressure Sensor yesterday - no change.

So now I have a brand new LPFP from Fuel-It, a new OEM remanufactured HPFP, and a new Fuel Pressure Sensor.

The onboard computer still says the Fuel Pump is bad but the 2C01(High pressure fuel system, fuel pressure: Minimum pressure undershot) and 2BF5 (Rail pressure sensor, plausibility: Minimum pressure undershot) are gone.

The white smoke from the exhaust is now even more - a lot of white smoke that smells very strongly like gas - both idling and driving.

Where should I look next? Is it likely that one of the Fuel Pumps I replaced is bad?

What does the massive amount of white smoke that smells like gas tell us?

Current codes:

2EFE Combustion misfires, several cylinders detected
2F03 Cylinder 5 Misfire Detected
2EE0 Combustion misfiring, several cylinders, fuel injection deactivation*
2EF1 Combustion misfiring, cylinder 5: Fuel injection deactivation
2F04 Cylinder 6 misfire
2EE2 Combustion misfiring, several cylinders: damaging exhaust gas after start sequence
2EF3 Combustion misfiring, cylinder 5: damaging exhaust gas after start sequence
2EF6 Combustion misfiring, cylinder 6: damaging exhaust gas after start sequence
2EF4 Combustion misfiring, cylinder 6: Fuel injection deactivation
2F02 Cylinder 4 misfire
2EED Combustion misfiring, cylinder 4: Fuel injection deactivation
00F1
212F
03E0
60F1
222E

[ERIKGARCIA]

Originally Posted by JB2

I replaced the Fuel Pressure Sensor yesterday - no change.

So now I have a brand new LPFP from Fuel-It, a new OEM remanufactured HPFP, and a new Fuel Pressure Sensor.

The onboard computer still says the Fuel Pump is bad but the 2C01(High pressure fuel system, fuel pressure: Minimum pressure undershot) and 2BF5 (Rail pressure sensor, plausibility: Minimum pressure undershot) are gone.

The white smoke from the exhaust is now even more - a lot of white smoke that smells very strongly like gas - both idling and driving.

Where should I look next? Is it likely that one of the Fuel Pumps I replaced is bad?

What does the massive amount of white smoke that smells like gas tell us?

Current codes:

2EFE Combustion misfires, several cylinders detected
2F03 Cylinder 5 Misfire Detected
2EE0 Combustion misfiring, several cylinders, fuel injection deactivation*
2EF1 Combustion misfiring, cylinder 5: Fuel injection deactivation
2F04 Cylinder 6 misfire
2EE2 Combustion misfiring, several cylinders: damaging exhaust gas after start sequence
2EF3 Combustion misfiring, cylinder 5: damaging exhaust gas after start sequence
2EF6 Combustion misfiring, cylinder 6: damaging exhaust gas after start sequence
2EF4 Combustion misfiring, cylinder 6: Fuel injection deactivation
2F02 Cylinder 4 misfire
2EED Combustion misfiring, cylinder 4: Fuel injection deactivation
00F1
212F
03E0
60F1
222E

White smoke I do not think it's due to lack of fuel.

[JB2]

Originally Posted by Dave @ Fuel-it!

No LPFP sensor

Dave,

I replaced the Fuel Pressure Sensor yesterday - no change.

So now I have a brand new LPFP from Fuel-It, a new OEM remanufactured HPFP, and a new Fuel Pressure Sensor.

The onboard computer still says the Fuel Pump is bad but the 2C01(High pressure fuel system, fuel pressure: Minimum pressure undershot) and 2BF5 (Rail pressure sensor, plausibility: Minimum pressure undershot) are gone.

The white smoke from the exhaust smells very strongly like gas - both idling and driving, lots of fuel coming through the exhaust.

Where should I look next? Is it likely that one of the Fuel Pumps I replaced is bad?

[Juan_BIGBOOST_TURBO]

I had a similar issue on a customer's 135i. We changed the HPFP and then the car had the same issues as yours, car would misfire above 12 psi, the issue was a bad remanufactured HPFP, ordered a brand new one from my local dealer and issues gone!

[JB2]

Update: Replaced HPFP again yesterday. No change.

[Zygote55]

Originally Posted by JB2

Update: Replaced HPFP again yesterday. No change.

Was there ever a resolution to this? I'm having the exact same problem (same codes, same thick, white fuel-smelling smoke from the exhaust). I've replaced the HPFP and swapped plugs/coils around with no success.