Rough idle, white smoke, smell of petrol (DIY or Garage?)

[den.sni92]

Hi all,

Without any warning my 35i all of a sudden lost the power whilst driving and started sounding VERY unhealthy.

I have parked the car for a day and then tried cold start to read the codes which resulted in clouds of white smoke, stink of petrol and lumpy idle.

Was hoping for somewhat straightforward DYI fix on the driveway now that weather is still warm.

Having scanned the codes I am now confused as to whether this is above my mechanical skills and the car will need to be towed to the garage.

The codes are

0029D0 - Combustion misfire, cylinder 4
0029F1 - Fuel pressure, plausibility
002A87 - Exhaust VANOS, mechanism
003100 - Boost-pressure control, deactivation
002C3E - Oxygen sensor 2 before catalytic convertor: Line fault
002CAB - Oxygen sensor 2 before catalytic convertor: Temperature

Car is on 79k miles.

If you were to attempt home fix, where would you start?

- Replace O2 sensor, clear codes and see if the car runs any better
- Replace injector
- Replace HPFP

Would a faulty Vanos solenoid cause all sorts of behaviour described and maybe that's the culprit?



Any help is appreciated.

[3798j]

You've posted in the E85/E86 (2003-2008) Z4 forum...it happens.
Go to the E89 Z4 forum...here: https://e89.zpost.com/forums/