Tom:

Check the duty cycle and report back -- if it wanders around KonEoff, probably have a computer problem.

13mA EHA current at idle hot is way too high -- check the duty cycle and try to set it to 50%, and see it the EHA current drops to around 0mA.

Your plugs are black because you are running very rich -- duty cycle is probably something like 35%. (or 75%, I cannot remember which way is rich.

Fixes are:

Correct mixture (fix any vac leaks first)

New O2 sensor -- bad one causes all sort of problems

ECU checkout and replacement if bad

Fuel distributor problem, causing excess fuel delivery (usually requires new fuel distributor).

Bad pressure regulator -- replace if leaking.

Peter

__________________
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!