Not familiar with your car, but in my 420sel their is an cable adjustment in the trunk, next to the antenna (driver side of the trunk). I believe there is a white know which determines the travel of the Sun roof. Give it a try.

hope it helps

Thanks

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87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)