This week I removed the fuel distributor as well as the housing attached to the throttle opening at the intake.

Upon close inspection, it appears that the lambda screw was run almost all the way in. Besides that, the spring loaded hex adjuster in the lambda tower was stripped at the point where it meets the adjustment screw.

I repaired the tower assembly, and would like to think that I set the air sensor zero (rest) position properly, but the service manual diagram seems different than what I'm looking at on the bench.

Assuming the zero position is set properly, the next step is to establish 1-2 mm of air sensor movement (play) from the zero point to the point that the assembly contacts the FD's control plunger. I used the lambda adjustment to bring this in from the 4mm play that existed after setting the zero position.

With the FD assembly connected to the fuel line and pressurized, a drop of gas forms on the tip of the control plunger. There is a serviceable seal beneath the threaded insert that surrounds the control plunger. A slotted tubular wrench is used to access it. However, even though the procedure (with a tool number) is described in the manual, there is no part number for this plunger seal.

After bridging contacts 7&8 at the fuel pump relay connector, pressure was maintained at about 5.3 bars. I removed the injectors and mounted them in plastic bottles. The spray pattern seems acceptable, and manually deflecting the air sensor plate controls the flow evenly.

I ordered some non-resistor plugs from Phil. 5k ohms less resistance than what was on the car.