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Originally Posted by dieseldiehard
Hockeynut, I believe there is a controlled leak, or the orofice in the small plastic inline fitting sets the vacuum. I was advised to change my fitting from yellow to green, the size of the small opening is all that changes from one to the other. I can't tell you where the vacuum drops but I'll try to figure this out. All I know is the shift points up shifting are set by the valve and coming down I believe its the leak that determines the shifts. This is so simple its mysterious!
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Thanks - I've been through the orifice thing on another post and tried to find out about it for my '81 240D - found out they didn't start putting them in the 240's until '82. I should just get my hands on one to see if it helps or not. I have a new brake booster vac line coming because all my troubles didn't start until I drilled out my T fitting with a 1/16" drillbit (per a trans adjust paper in the DIY section) You don't have an old orifice you would want to part with, do you?