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My 530d is running rough at idle only when cold. After a few minutes driving the car is as smooth as silk with loads of power. Was thinking it was injectors but if it were injectors would'nt the rough running be there all the time? The egr valve is spotless and oil breather was changed recently. Have been told that it could be glow plugs but car starts first time everytime. Any idesa?

rgds
 

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I do not think the glow plugs would cause this as they just get the car started - and as you say the car starts first time.....
 

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IIRC the glow plugs do stay on for a certain amount of time while the engine is running when started depending on how cold it is.

I would also suggest getting the fault codes read for the car, any good BMW specialist or main dealer will be able to do this for you
 
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