Hi everyone, I'm currently working on making my transmission shift properly and did some testing at various points in the vacuum system. The output from the pump is within spec (22-24 inHg), however I believe I'm getting too much vacuum going to the VCV and too much at the output of the Vacuum Transducer (Blue UFO). I've attached a diagram with the locations I tested marked. I got about 22 inHg at point 1 at idle and while it did decrease with throttle I believe that is too high. At point 2 I also got about 22 inHg which I suspect to be high as well. If anyone knows the specifications for vacuum readings at those points on an 85 model it would be much appreciated. I'm also curious if the vacuum signal to the transmission is the same for the 722.3 and 722.4 because my engine and trans are from an 81-84 SD so I believe it has the 722.3.
Diagram with Test Points:
06-07-2021, 12:14 AM
Threaded Mode
