Chuck:

Sorry I've been so late in answering this, I've had a couple projects here keeping me busy.

For whatever reason, you do not have closed loop lambda control. I'm not real familiar with that version of KE-jetronic, but either you don't have the closed loop "message" getting to the computer (oil temp or coolant temp) or you have a fuel distributor problem.

When you change the setting on the mixture screw, how long do you wait to see what happens? At idle it will take 20 sec or so for the O2 sensor to work, and it may in fact NEVER be in closed loop at idle unless you have a heated O2 sensor -- the older ones are only in closed loop with the throttle open and the sensor heated by exhaust gas.

The other thing to look at is basic fuel distributor operation -- control flap centered and at the correct height, plunger moving freely, pressure regulator working, no restrictions in the return line to the tank, etc.

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!