Hi, I got a really strange, temperature related shifting problem on my '87 300TD Wagon. It started few months back and the car would not shift into 4th gear, but only once it has wormed up; for the first half hour or so it all works perfect and then, once wormed up (not overheated) it stops shifting to 4th and it even once downshifted into 3rd while just cruising on the highway!
Then, again, next day in the morning when car is cold it all works fine.
I did change fluid and filter and it seemed to have helped; it all worked for about 2 weeks but then it got back.
I did disconnect kick-down switch, but this did not help either.
I did visual inspection of the vacuum lines but could not find any obviously broken.
Now, just recently, the car stopped to turn of with the key; I need to open hood and manually stop the pump.
Could someone please help on how to diagnose what is really going on; are there any steps to follow?
Was looking around but could not really find related thread.
I went to couple of local transmission shops, but non wanted to touch my car; they said that they could spend tons of time and not find a problem "because it is Marcedes and on top of that it is diesel" !