Fuel injectors are about $20 each.

You need a digital VOM with a frequency/duty cycle function. Sears has several that run about $40 or so.

With the DVOM, you can measure the duty cycle signal from the oxygen sensor system and set the base fuel mixture. If you have a direct connection ammeter, you can also measure the current through the electrohydraulic acuator (EHA) that controls the feedback fuel mixture control,

However, the first thing I would do is check for vac leaks, especially at the idle control valve (silver "can" under the air cleaner, two large hoses) since a large vacuum leak will allow air into the intake that isn't measured by the fuel distributor air meter flap -- this causes lean running, rough idle, and poor vacuum. Idle speed is regulated by the idle control valve, so it won't change much, but hte vac leak will cause mixture fluctuations.

See the article on electronic engine controls in the DIY section on this site for details.


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!