Jeff: That is right. In the
Jeff: That is right. In the rest position the air flow sensor "plunger push" arm rests BELOW the plunger, not even touching it. The plunger justs rests in it's own stop within the FD....this stop is adjusted by the double slotted screw....it has to be in the right position. The air flow sensor plate won't even move when you remove the FD. The AF sensor is stopped by a pin within the AF housing.
That is the difference between the "rest" and "basic" positions.....check your new Bosch service manual. The rest position is that with the engine off, as you have it on the table. When you move the sensor plate down you will "feel" a touch.....this is the basic position, where the AF meter lever just touches the plunger. These are 2 VERY important measurements....and must be EXACT!!!!! The basic position is determined by how much the plunger protrudes downward.....regulated by the double slotted screw. Does this make sense?
The AF plate measurement is in the rest position. It is adjusted by punching on the pin. One then moves it downward to where it touches the plunger, and sees if the edge is where it should be. If not, then one adjusts the double slotted screw I am referring to. The AF mixture screw is for fine adjustments with a CO meter.
Remember when you told me that the "touch" was about 3/16 inch, while you moved the sensor plate? This was the distance between the rest and basic positions. That "touch" was when the plunger arm of the AF sensor just touched the FD plunger.
You and I will be experts on this in no time!!!!!