35d Won't start in cold.

[FunfDreisig]

Originally Posted by xDrive35d

Another one I read earlier;

x5 deisel, battery drain; TOW, left me sit in the - bimmerfest - BMW Forums

I just added this to the thread quoted above...

Originally Posted by Funf Dreisig

.... There has been some speculation that this might be due to the the 35d pre-warming the glow plugs every time the driver's door is opened.

Funf Dreisig

Since posting this, it has gotten cold enough to see the glow plug light come on in cold weather. I now think this 'speculation' about the glow plugs coming on every time the driver's door is opened is probably not correct.

However, at least on a 35d, there IS a significant drop in voltage every time the driver's door is opened. I don't profess to know what causes this voltage drop; but you can prove that it happens, with a little time and an inexpensive volt meter. Just hook the voltmeter up to the "jumper points" under the hood then close the driver's door. Wait for the voltage to return to 'normal'. Then open the driver's door again.

Funf Dreisig