Question about 1994 Mercedes-Benz C-Class

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Uncontrolled downshift of 1994 c220

Uncontrolled downshifts

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  • Lito Almajose Dec 02, 2012

    can anyone help me identify and fix the problem on my 1994 c220? I have just had my automatic transmission overhauled due to a leak problem in the selector switch. since, the tranny is already pulled down and the linings are showing signs for replacement, i decided to replace them all to maximize my labor cost. the problem is the car shifts perfectly from 1-4. however, when it reaches 60kph, it uncontrollably downshifts to 3rd gear and just stays there and never upshifts to 4th. after downshifting from 4th gear, it downshifts normally to 2nd and 1st when you slow down and stop. when you go again from 1st gear, the car shifts perfectly going to 4th and when you reach 55kph or 60kph, it will again downshift to 3rd. this means i cannot use the car on long drives or simply could not drive over 50-60kph. we have tried to replace the governor with no success. fluids are obviously new and levels are correct. i would say the shop where i had it overhauled is competent. although they admit that this is the first time they have encountered a situation like this. we are now on a joint effort to research for a solution on this problem. hopefully, somebody could help us through thier experience or thoughts on this problem. thank you and happy motoring to all!


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No 4-3 or 3-2 downshift
uncontrolled downshifts outside range of kickdown switch
poor acceleration from stopped position
parking pawl will not engage
selector lever does not engage in r or p
engine will not start in p or n position
smoke in exhaust (fluid loss)
fluid loss between torque converter & primary pump
howling noise when changing gears (under full load)
howling noise which increases as engine rpm increases
1st gear & reverse too loud
3rd gear too loud
rattling noise at 1500 rpm in all positions except r
light grinding noise in p & n positions
rolling noises when driving in reverse
vacuum control circuit
Vacuum Control Valve (E300D & S350D)
Vacuum Amplifier (E300D & S350D)

Posted on Dec 02, 2012

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