I'm getting around 12" entering my blue vac amplifier on my 85 300TDT, only getting under 5" to my trans. When its cold the needle on my mityvac doesn't move when I increase throttle. Could a bad vac. amplifier be my problem? Has anyone heard of them going bad. I understand they are only on 85 and abouve model. Thanks PS I'm getting a reading of 20" off of the main line.

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85 300TDT 456,000 orig. miles

Shear,
I took the readings on my amplifier ('85 TDT) for someone on an old thread. The tread was started by smartin, you can find it in a search under title "quick transmission shifts". I've copied what I think you need to know here in case it helps:

smartin,
I did some quick checks and I hope I got what you need. I tested both lines coming out of the top of the round, blue amplifier with my mityvac and got these results:

Center line (white/translucent with blue stripe)
at idle:14"
at 2000+ rpm:14"

Off center line (black plastic that looks like it goes to tranny modulator)
at idle 17.5"
at 2000+ rpm 13.5".

As I revved the engine higher the vac dropped but ony marginally. The drop in vacuum appears to be a linear progression as the rpm increases, there was no sudden drop as near as I could tell. Even revving the engine higher (I'm guessing 3,000 rpm or so) the vac never dropped below 12". Also, I never heard a click but I did this test in my garage so it was noisy enough that I probably just never heard it.

I didn't check the line coming out of the bottom as it appears to be a vac source line. I wouldn't put too much stock in the exact mityvac readings because I doubt those gauges are completely accurate.

I have a feeling I may have created more questions that I answered but I hope this helps anyway.

LRG

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold