Mercedes-Benz W201 automatic kickdown and shift points
Why does the W201 automatic not downshift on kickdown?
On the 722.4 automatic the kickdown is electric: it is activated by a pressure switch under the accelerator pedal, not by a cable. Check the switch wiring and connections. Dust built up inside the switch can prevent it from working, and cleaning with compressed air helped. The pedal must not stay caught on the mat.
How are the W201 automatic's shift points adjusted?
The shift points are set by the tension of the cable between the throttle linkage and the transmission. A tighter cable shifts at higher revs, and a cable that is too tight breaks again. The adjustment is made at the throttle linkage.
Why are the W201 automatic's shifts harsh or late?
Vacuum affects how hard the shift is, so the vacuum lines should be checked. A vacuum leak makes shifts jerkier, and the vacuum circuit on the side of the transmission can be tested with a hand pump. A cable that is too tight also delays shifts.