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Originally Posted by braverichard
Well it sucks that's for sure. I just completed replacement of the two valves (my old ones were shot for sure) but the clunks remain.
So, I guess my problem lies in the vacuum control valve on the injection pump. What is this thing anyway? And also, what does it involve to measure all those vacuum levels you mention? Do I need a mityvac or something?
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Don, I wish you would have asked me prior to buying those valves. I recently tore out all the 3/2 valves, all the Tecalan lines to the 3/2 valves and all the lines from the 3/2 valve to the EGR temp switch and the valve itself. Cleaned up the underhood environment completely.
The SD never knew the difference. Completely the same shift quality and shift points.
Connect the Mityvac to the line down to the transmission using a suitable "T" and route the gauge to the inside of the vehicle so you can read it while driving.
Then take it for a drive. As mentioned above, you should have very close to 20 inches at idle and it should steadly drop as you open the rack and add more fuel. At maximum power, it should be very close to zero. The valve is adjustable, slightly, and the vacuum curve can be shifted left or right by rotation of the valve on the IP. I have not done this yet, but would like to attempt it to firm the shifts slightly on the SD.