Reverse gear problem (Auto) - 320CE

fat-fuchspk

New Member
Joined
Feb 15, 2009
Messages
3
Reaction score
0
Hello, I have a problem with the reverse gear on my 320Coupe. The gear selects fine but when the throttle pedal is pressed the car judders violently as it reverses. On flat ground, with the car in reverse, but with no power applied it glides backwards without fuss until the throttle is pressed. Any ideas? Hoping its not a new gearbox....
 

Xtractorfan

Senior Member
Joined
Nov 16, 2007
Messages
6,084
Reaction score
156
Your Mercedes
S class
Have you checked all the mountings right along the engine and power train, weak rear shocks can also cause the rear axle to judder under heavy acceleration..
 
OP
F

fat-fuchspk

New Member
Joined
Feb 15, 2009
Messages
3
Reaction score
0
  • Thread Starter
  • Thread starter
  • #3
Thanks for the reply, I'll check the areas mentioned.
Regards
A
 

Wellington

Active Member
Joined
Mar 25, 2009
Messages
32
Reaction score
0
Try a Stall test, see if the transmission slips in reverse, stall speeds forward and reverse should be the same if neither drive range is slipping, this eliminates external factors as have been suggested, a higher stall speed or even runaway in reverse would probably be damaged clutch plates.
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
Try a Stall test, see if the transmission slips in reverse, stall speeds forward and reverse should be the same if neither drive range is slipping, this eliminates external factors as have been suggested, a higher stall speed or even runaway in reverse would probably be damaged clutch plates.

Good idea, put the car in R with foot on brake and rev the engine, should not go over 2k RPM. Only do it for max 20 sec
 

Richard Moakes

Senior Member
Joined
May 19, 2002
Messages
1,751
Reaction score
204
Location
Newton Abbot, Devon, UK
Your Mercedes
1991 R129.066 M119.960; 2005 W164.175 M113
A word of caution about stall tests on 'faulty' automatic transmissions.

I had a mechanic perform a stall test on a Subaru automatic trans that had a slipping reverse gear, he had all the pressure gauges connected and followed the factory procedure.

One very loud BANG later, it ended up costing me £3500 for a new transmission.

YMMV, but I urge caution and suggest taking it to a transmission specialist.
 

You lost your key ? Or maybe you need a spare! Your vehicle imobilliser does not respond anymore? WE CAN FIX THEM ALL !! Mobile ! Save Time and Increase Profits With us !
Top Bottom