Pin 3 to gournd (pin 2 or engine) will read out duty cycle for the EHA, should be 50% unless yours in one that is supposed to be 70% (that information is in the manual).

however, i find that I must leave the ground lead on my cheapie Sears meter disconnected to read duty cycle, otherwise it just reads garbage.

Check for vac leaks (idle control valve hoses, air flow meter horn boot, injector seals and injector holder seals) before adjusting, else it won't get better.

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!