Quote:
Originally Posted by X5Sport
Regardless of glow plugs operating or not - most don't if the air temp is above 5deg - you will almost inevitably get a puff of smoke.
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Just to clarify glow operation in M57N (DDE 5.0/5.1). They actually operate with coolant temperature up to +25C even if you don't see the message on the instrument cluster. Air temp doesn't affect the operation. See quote from TIS below.
My 3.0d puffs smoke at the start and I get error code from all the plugs indicating that the control module isn't working. I'm planning to change that and possibly all the plugs. I'll report if it has any affect on smoke.
From TIS:
Preheating
At coolant temperatures below 25°C, there is a preheating period of 0.5 seconds. The preheating period increases as the temperature falls, reaching a maximum of 2.7 seconds at a coolant temperature of less than -25°C.
Activation of the glowplug system on the instrument cluster only occurs at coolant temperatures below 0°C.
After-heating
At coolant temperatures below 30°C, there is a temperature-dependent after-heating period to improve idling and exhaust emission characteristics.
Start preheating
Start preheating takes place for approx. 10 seconds if after the preheating time has elapsed the engine is not started and the ignition remain on.