[M_Dennis87]

So I've been chasing some smells when the heat is on and leaks lately with my car. It's a 2012 E91 with about 55k on the clock. I recently replaced a leaking oil filter housing gasket and cleaned everything up in the engine bay, but I'm still smelling a slight burning smell on startup. Doesn't quite smell like burning oil either, though there is still some oil residue under the intake manifold that I think is from the OFHG leak. There is no oil in the spark plug wells.

So I still have the burning smell when the heat is on which is particularly bad at startup, but does eventually go away after the engine is warmed up. Another symptom I've noticed is sometimes on startup, the rpms fluctuate. This usually goes away after 10-20 seconds. Also, lately I have noticed a consistent white smoke from the exhaust. I know it's winter, so I'm not sure this is a symptom of anything but driving in the winter, but I figure it may be worth mentioning.

So my thoughts are it could be relating to pcv breather valve. I've seen a couple recalls that could be related (NHTSA 17V676 Blower Motor Wiring may Overheat, 17V683 PCV Heater may Short Circuit), though MY model year isn't listed on the recall. Not sure if it's because it's a 2012 and all N52 3-series cars ended production in 2011 except for the wagon. Either way, any help or info would be greatly appreciated.

[porsche959]

Yeah dude that’s probably the wires burning up. Get that’s fixed ASAP unless your into burnt cars.