Before I fixed my #6 glowplug, the car would buck, knock and emit clouds of bluish-white smoke on cold start up. Now it starts instantly (coldest so far this year is 10 deg.) and purrs like a kitten until the plugs de-energize. After that, it gets a little noisier but still within normal parameters.

I wonder if you have at least one weak plug that's not working well enough to help with combustion but not malfunctioning badly enough to set a code...

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250