I know it's not a diesel but you guys are so helpful and I couldn't find anything in the tech or diesel forum searches.

The car is a 91 300SE. The owner brought it to me with the complaint that it would only occasionally upshift out of first. I found that the vacuum modulator was bad and replaced it today. Now it shifts perfectly in all gears except 4th. In 20 miles of city driving I got it into 4th once and it downshifted into 3rd after a minutes at a constant speed. It will not upshift into 4th under any condition, high RPM, light throttle, cold, warm, etc..

What is wrong, it's driving me nuts. All the other gears can't get much nicer.

__________________
Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section