The screw on mine does not have a slot in the end. It's more like just a threaded stud.

I tightened the lock nut back down to the point that when I applied further force the throttle linkage on the other side of the VCV started to move. Still the vac remains at 15".

I will continue to try and do something. I'll also try to post a pic of my set up.

I completely removed the lock nut. Due to the vibration of the engine, the piece I earlier described as a nut with two flat surfaces located behind the lock nut slid out. When this piece slid out I could see that it is a round sleeve looking thing about 3/4" long with a slot in it.

With the piece partially withdrawn I can turn it. If I rotate it CCW I can get the vac down to 8". I cannot figure out a way to keep it there and tighten the lock nut.

I have some pics, but I haven't taken the time to figure out how to attach them

Can you turn the car off and find a small slot screwdriver that the locknut can slide on, then hold the scredriver with one hand and run the nut down finger tight, start the car and make the final adjustment and tighten?

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D