Question about the vacuum on auto transmission
Question about the vacuum on auto transmission
What is that part called? Is it a solenoid or is it a valve or modulator? Should it leak vacuum at a determined rate or should it maintain vacuum? I guess I need to know if mine is bad and what it's called so I can order the part and replace it.
82 240D
I'm working on my 82 240 auto and have multiple vacuum leaks, in trying to track them down, one of them is in the transmission circuit that reads throttle position telling the transmission how firm and when to shift. What I've learned is that with no vacuum the transmission acts as if it's at full throttle shifting to second at approx. 25mph then to third at 40mph and no sooner, even if I let off the throttle. On the other hand, bypassing all the other vacuum stuff and going directly to the transmission, it shifts very early and soft even at full throttle. The line on the transmission had a bad connection so I fixed that and with a solid connection it still bleeds vacuum at the transmission.
What is that part called? Is it a solenoid or is it a valve or modulator? Should it leak vacuum at a determined rate or should it maintain vacuum? I guess I need to know if mine is bad and what it's called so I can order the part and replace it.
82 240D
1987 300SDL 6spd manual om606.962 swap project
1985 300td euro 5spd wagon running
willbhere4u
01-11-2012, 08:34 PM #2vacuum shift modulator
1987 300SDL 6spd manual om606.962 swap project
1985 300td euro 5spd wagon running
I don't know the procedure you probably need a vacuum gauge tee'd in to the line? there's probably some good info out there on Google
1987 300SDL 6spd manual om606.962 swap project
1985 300td euro 5spd wagon running
willbhere4u
01-12-2012, 10:45 AM #4I'm not sure I know you can test them.
I don't know the procedure you probably need a vacuum gauge tee'd in to the line? there's probably some good info out there on Google
1987 300SDL 6spd manual om606.962 swap project
1985 300td euro 5spd wagon running
Adjusting engine throttle linkage for best performance. Engine( off ) depress throttle to full,CK.injection pump at max.Remove air filter Top ck. throttle blade.NOT to be at full open. Engine performance drops with a loss of manifold air speed. Air blade Midway between 3/4 and full. Test drive and readjust more or less for best. Good luck.
Start at modulator,connect test hose to plastic vac. fitting on modulator, should hold vac. Two styles of modulators, Black rubber cap style,ck rubber cap, flexible,and not cracked,( replaceable ). Hard plastic cover style, ck. seal under cover.If these ck. ok, replace modulator, readjust. Yes you are correct,Shifting controlled by vacuum modulation Only.
Adjusting engine throttle linkage for best performance. Engine( off ) depress throttle to full,CK.injection pump at max.Remove air filter Top ck. throttle blade.NOT to be at full open. Engine performance drops with a loss of manifold air speed. Air blade Midway between 3/4 and full. Test drive and readjust more or less for best. Good luck.
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