Behind the brake booster , there is a Switch Over Valve with a green vac line going to the trans...unplug that line and retry the car..

Your RPMs are not 40K and 10K..they are 4K and 1 K. [K =1000]

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A Dalton

Hi Arthur,

The one thing to remember though is that the upshift delay system can only retard shifting the amount a full throttle shift would. Even if the cable gets stuck fully pulled.

I'd also suggest the kickdown switch, but it also won't prevent a shift, only delay it. I started to write about the common no shift problem of the check valve spring jamming the secondary pump and then breaking the governor drive gear. But that car probably doesn't have a secondary pump. It would have a governor though and I have seen them stick. I would surely check governor pressure as a first step.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Governor would make more sense... specially those sticky Spitzer Governors...

I knew an old tranny guy that told me he used to take them out on a real sandy/dirt road [ so the tires would not have traction] and stick the tranny into Reverse at about 10 MPH..he swore that would free up a sticky one, but I never tried it..mainly cuz he was a Wack to begin with..but, he was a VET tranny guy.

I am limited on autos....

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A Dalton

I was about to ask if he had a turbine engine...

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black