vacuum modulator adjustment question (??)

my 87 300TD has been shifting really hard for the past three weeks. About 5000 miles ago I had the transmission rebuilt due to the fact that it was leaking out of every place possible.

when I picked up the car the tech asked if I would like it adjusted for feel.

It was adjusted and it still was a pit of a lunge after all was said and done. -It shifts hard on 1-2 and delays 3-4. I then reworked and checked the
entire car for vacuum leaks. almost all the rubber was was crumbling, the vacuum was not even attached to the transmission (the shop it was in recently said that it had been so I over looked it)

---one most always do it your self it for want to done right I guess---

when I picked up the car from the transmission shop they turned something on the bottom of the trans to adjust and there is the modulator on the side.

I replaced the rubber on all the systems and plugged the line into the transmission. When I bought the car the vac line going into the EGR was disconnected and plugged with a strew I plugged it back in.
After I hooked every thing back up and got every thing hooked up. I started the car and put it into gear. the engine stalled out. so I unhooked it form the ERG and and it ran fine. when dose the EGR do exactly? what was happening? clouds of white smoke! should I replace this part?

after all has been reworked it shifts much smother with none of the strangeness of before but it is still to hard a shift. which way do I turn the modulator and how much? what was the other thing the tech was turning?

J

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Jonathan Boynton

I have a totally different vehicle, but did a bunch of reading on this using the search and can maybe help. On mine, the modulator valve is on the left side of the transmission, a red colored can-like thing about 1 1/2" - 2" diameter with a black soft plastic cap. There's a vacuum line from the body leading to the intake manifold. To adjust, remove cap (small screwdriver), revealing a serrated ring with a 'T' shaped metal bar lodged with each end of the 'T' in the serrations. Pull bar out, turn clockwise to increase vacuum (shift harder), counterclockwise to decrease (shift softer).

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1986 560SL
2002 Toyota Camry
1993 Lexus