Bmw 320 d 150 bhp rough idling when starting cold

HELP!! White with a hint of blue smoke at start up - TDIClub Forums

https://forums.tdiclub.com/showthread.php?t=422402

Aug 27, 2014 - It burns and results in white/blue smoke on startup, but should ... So the leaked oil burns off after initial startup, but quits smoking after a few minutes. ... to try tomorrow morning. if I remember correctly the smoke at start up just ... yet another white smoke on cold startup - maybe fixed?
Jun 28, 2009
White smoke at start up?
Jan 25, 2000
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The EGR valve opens when the engine is warming up, which allows exhaust to enter the intake manifold. This is essentially "extra air" coming into the engine. The engine has an "idle speed control" function, which is either a solenoid or small stepper motor connected to a valve that allows a controlled amount of air to "sneak" by the throttle plate in the throttle body. Fundamentally, it is the amount of air entering a fuel injected engine that controls engine RPM. A defective idle speed control ("ISC) motor or solenoid can cause the problem you stated. (I do not know which type is used in your BMW.) Often, a check engine light will illuminate of the engine computer cannot adequately regualte engine idle speed.

Thinking possibly the air temp. sensor (mounted in the
air cleaner housing) Really need to see scan data to tell for sure
but that costs a fortune at a dealership.air temp sensor is fairly
cheap.

I'am not sure but sounds like an automatic choke problem

bmw should NOT SHAKE THE STEERING WHEEL AT ADLE. OK SOUNDS LIKE ITS RUFF UNDER LOAD LIFT THE HOOD AND CHECK FOR A HISSING SOUND IF SO IT IS VACUUM LEAK. MOST COMMON. iF TAHAT ISNT IT LETS MAKE SURE ITS IDLEING AT 800 RPM IF HIGHER PLEASE PUT ON FORM HERE AT FIX YA AND WE CAN WORK THIS OUT CHECK IDLE, CHECK ENGINE LIGHT, AND THEY ARE BAD AT NEEDING MOTOR AND TRANS MOUNTS MY BET WOULD BE ON MOUNTS

the problem could be in air mass flow sensor, but it's expensive

Your oil is a little low, and the timing may be off a bit but if it smooths out after warm it is probably ljust
low oil.

I hate to be the barer of bad news, but may be the head gasket.

My car started with rough idle. Then very hard to start in cold weather. Next started overheating, but no output from heater. Trickling sound from behind dash board. Overflow bottle overflowing.......

I replaced the water pump, radiator cap, thermostat, coolant, fan belts, power flushed the system. Nothing worked. Some research gave me the answer.

The head gasket leak was allowing exhaust gases to enter the cooling system, displacing the coolant. After use, as engine cools, coolant is sucked back into the system and coolant seeps into the cylinder. This gets worse over time.

First thing you'll notice is the rough idle as the spark plug burns off the coolant in the cylinder. (This is especially true at low temperatures.) If it is the head gasket, the other symptoms will follow as time goes by.

Sounds like a vacuum leak, check and listen under the hood at each vacuum connection and hose.