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With the Mityvac connected to the supply vacuum on the T (opposite end of the T goes to the transmission and the bull goes to the VCV), how fast does the vacuum drop?
Can you pump it up and will it hold any vacuum?
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It falls almost instantly, i can pump the MV to 10 mmHg and it falls to 0 within a second.
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Does this VCV had a round plastic cover facing you that can be removed...........with an adjustment screw beneath?
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It does have a round plastic cover that looks as it *may* be removable, but I can't see how this could be done. It does have two screws which holds the side on. I have an 82 300DT, which I would think would be the same VCV as an 84 SD. The part number on it is 1230700046.
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Unless I have missed it, you have NOT removed the VCV from the engine/IP and bench tested it all by itself and this is a relatively easy task.
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Just did this. Took me a minute to figure out how to remove the throttle linkage. Now it's staring at me on the table here.
I'm assuming that testing it is as easy as closing the input from the rack all the way, and punping it up from where the dashpot would usually go. No connection required to the other port on the VCV , since it's just for bleeding vacuum. Initial test results indicate I have a bad VCV.
Sam, I'd be interested in your bench testing notes to verify.
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Yes, these engine/tranny vacuum problems can be frustrating but they are NOT insurmountable.
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all made possible by you guys, thanks again. Im having a lot of fun diagnosing this one. It's relaxing only because Im not depending on the car...
dd