Vin:

Get a 3 mm allen wrench. The mixture adjustment is at the bottom of the "tower" that lines up with the hole in the air cleaner. If you get a long enough allen, you can set the mixture with the air cleaner on, otherwise remove it.

Insert the wrench (you may have to remove the original pressed in cover if no one has adjusted the mixture before), fit it into the socket, then press down and turn slightly CW (I think) while watching the duty cycle meter, engine warm and running.

You want about 50% -- 35% is too low, you are out of control range rich. If I'm wrong on the direction, turn CCW. Don't turn very much at a time, and pull the allen back up and wait at least 20 sec after each adjustement before deciding to adjust more -- at idle, it takes a while for the exhaust gasses to get to the O2 sensor, and you will go rich every time you push down on the keyed adjuster!

Shouldn't take more than a quarter turn to get you set right.

This will make a BIG difference on performance and milage.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!