I have a 1990 560 sel ran perfect , stopped car and next day no up shift at all. I can but it into B1 and then go back to D and feel the difference.
I can take the car up to 35-40 mph and release but still no upshift.
I checked the kickdown solenoid and powered it externally and it clicks;I don't know vacuum pressure but can feel vacuum at tranny. I can't afford to send it to a shop. So trying to do my own repairs as I have always done in the past.
HELP