190e 2.3 Auto Trans Shift Problem
The car is a 1988 190E 2.3 with 135,000 miles. Though the 1-2 shift has always been hard, the unit did upshift and downshift fine. Until last week. Without any symptoms, the trans now wants to, "most of the time", start out in 2. Under light throttle, the 2-3 and 3-4 shifts are fine. If I use heavy throttle from stopped, the car will start out in 2 and then abruptly downshift to 1 and then immediately upshift to 2, with both the downshift and upshift being "hard". You can re-set the trans to start out in 1 by moving the shift lever to park and then back into drive, but downshifts thereafter are only down to the 2 gear.
Does anyone have any idea of what the cause could be and how to repair it?