[cahme]

Long story short
After shutting down my car for 5 min, startup revealed very rough running and activated the SES light.

I pulled over after 1 block and disconnected my JB4 (disconnected battery, then swapped for factory connections and disconnected JB4 ground leaving power connected to fuse). After a long crank, I limped home. Once home, I disconnected battery and reconnected JB4 ground leaving the factory connections (ie JB4 TMAP/MAP/Boost are not connected, but DME wires are still connected), but I got no communication to JB4 either by steering wheel controls nor USB interface.

I got a bmwlogger cable and with their sw, I was able to get these codes (descriptions are from MEVD172 codes doc floating around):
29E1 Charge-air temperature sensor, electrical : Short
2C70 Boost pressure sensor, electrical: Short circuit
281B Absolute pressure sensor, intake pipe, electrical: Short
2C58 Boost pressure control, deactivation: Boost pressure build-up blocked
2EFE Random/Multiple Cylinder Misfire Detected (DTC Desc)
2F04 Cylinder 6 Misfire Detected (DTC Desc)
2EE0 Combustion misfiring, several cylinders: Fuel injection deactivation
2EF4 Combustion misfiring, cylinder 6: Fuel injection deactivation
2F03 Cylinder 5 Misfire Detected (DTC Desc)
2EF1 Combustion misfiring, cylinder 5: Fuel injection deactivation
2F02 Cylinder 4 Misfire Detected (DTC Desc)
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
2EF0 Combustion misfiring, cylinder 4: damaging exhaust gas after start sequence
2EED Combustion misfiring, cylinder 4: Fuel injection deactivation
2EE1 Combustion misfiring, several cylinders: Fuel injection deactivation
2EEF Combustion misfiring, cylinder 4: damaging exaust gas
36FD DME main relay: implausibly open


I then cleared the codes and started the car long enough to get the SES light again ( 5 sec, note NO long start this time) and then got these codes:

2EFE Random/Multiple Cylinder Misfire Detected (DTC Desc)
2F04 Cylinder 6 Misfire Detected (DTC Desc)
2EE0 Combustion misfiring, several cylinders: Fuel injection deactivation
2EF4 Combustion misfiring, cylinder 6: Fuel injection deactivation

One other tidbit is that once home, I was unable to start the car again due to battery not turning over the starter (12.3 V).

I have an idea of my next step (HPFP), but wanted other opinions ...

[F80_M3llow]

Deff from the faults sounds like your hpfp is taking a crap.

[weehe126]

Originally Posted by F80_M3llow

Deff from the faults sounds like your hpfp is taking a crap.

Lol wat? He has misfire codes, nothing to do with the HPFP. Since the batter was low and you got random misfires, replace the battery and see if that fides it. Low battery power causes weird problems. If thwt doesn't work the do new plugs, tben new coils.

[cahme]

I swapped my HPFP and it's running good again.

I started at the HPFP as I went from zero misfires to multiple cylinders misfiring. The engine barely ran and it was immediately thrown and consistent over several run cycles. It could have been a battery issue, but I chose to start with HPFP. Had it been an individual cylinder problem, I would have gone the plug/coil/injector route.

[weehe126]

Originally Posted by cahme

I swapped my HPFP and it's running good again.

I started at the HPFP as I went from zero misfires to multiple cylinders misfiring. The engine barely ran and it was immediately thrown and consistent over several run cycles. It could have been a battery issue, but I chose to start with HPFP. Had it been an individual cylinder problem, I would have gone the plug/coil/injector route.

Glad it worked out, but you should still replace the battery.

[kievlanine@gmail.com]

So the issue for you was a bad HPFP?
I am having similar codes, after a hard WOT pull, recently did plugs coils. Swapped plugs but not coils.
Misfire persists.

[cahme]

Yes, was HPFP, but in my case the car barely ran and had zero chance of even thinking about WOT. The SES light also came on and was flashing.