I bought a vacuum pump and hook it to my vacuum advance the distributor plate didn’t move. I tried the pump on a 1965 V6 VA and it did move. So I swapped them and the 300 seems to run great. So that is the answer, the question is; how did my VA fill up with transmission or power steering fluid? Yep, red oil. I tried pushing the rod into the VA and red oil came out the vacuum hole. I noticed before that the VA looked like it was leaking something, but I didn’t expect red oil. Any ideas?
Vacuum modulator for transmission has an internal leak sucking ATF into the intake manifold. The distributor vacuum advance is shot from sucking up the ATF. I'd change the transmission modulator and check the fluid level.
If the modulator is leaking that badly, the engine will smoke, and there should be transmission shifting problems as well. Pull the modulator and do the same vacuum tests on it. See if there is ATF on the vacuum side of the modulator. Simply point the vacuum nipple down and see if any ATF comes out. You don't want the engine burning ATF for very long. It will carbonize your cylinder heads, piston tops, and the back side of your valves. Then you will need to look over this thread https://www.v8buick.com/index.php?t...-the-carbon-build-up-out-of-my-engine.385630/
