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Old 04-30-2012, 12:56 PM
mopart2 mopart2 is offline
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Join Date: Oct 2011
Posts: 68
VCV - 0 in Hg? 1985 300SD

Hello all,

My 85 300SD transmission flares from 2-3 and 3-4 slightly when the transmission is cold. Once everything is warmed up, it seems to shift fine.

I took some vacuum measurements yesterday and have attached an image. (Hopefully you can read the measurements in red)

The system shows 20 in-Hg @ idle when I tap into the white line and plug the other end. 15 in-Hg inline measurement.

It seems as if the VCV shows 0 in-Hg the entire time with no metering as I drive it around.

The transmission line does show a change from 6in-Hg to 1in-Hg as I depress the pedal to full throttle.

Does this mean the VCV valve is bad?

Should I test the vacuum modulated on the transmission next? Or just adjust the setting?

I am confused at what the purpose of valve #125 is in the attachment.

Sorry for any confusion. I am attempting to follow some of the basic diagonistics to see if I can get rid of this 2-3 flare.

Fluid (including TC) and filter was changed 5k miles ago.

Any help is appreciated.

Thanks.
Attached Thumbnails
VCV - 0 in Hg?  1985 300SD-42003543_with-measurements.jpg  
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1985 300SD 200K
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