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95' E420
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Discussion Starter #1
Hi folks,

It seems every day I encounter something with my 95' E420. Now upon kickdown the AT will hesitate a little then down shift and will not shift UP that easy. In other words, after kickdown from a rolling or dead stop position the AT will not shift UP reaching the cutoff point. It will only shift if I pull back a bit on the pedal..?

Any thoughts about this?

DH
 

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money pits of various forms
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5,885 Posts
Yes the button on the pedal needs replacing. Alternatively, you have some bunched up carpet down there.
 

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money pits of various forms
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The switch would be responsible for cutoff below the Redline then? (around 5400 rpm)..
The switch under the pedal is what actuates the kick down. The fact that you have to move the pedal to get it to work indicates to me that this may be the problem. It really may be as simple as the carpet. Otherwise it could be a problem with the kick down relay although I am not familiar with the gassers that much. I picked up a spare relay this weekend I would let go for $20 if that is what the problem is.

Take a look at the button make sure its clear and make sure it clicks when you press it. Hook up a multimeter and see how it goes.
 

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95' E420
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Discussion Starter #5 (Edited)
The button does click when pressed and there is no carpet pile up around there.. What would the proper voltage across the multimeter be? I also narrowed down the problem...

If I am rolling at 2000 rpm or higher and floor it, it down shifts good and picks up good so the kickdown engages but will not up shift and reaches cutoff at 5400 rpm.
At this point I have to release the pressure on the pedal a little bit and press again to continue upshifting..?

Its only doing this when coming off a dead stop.

I don't hear any clicks when I kickdown though..

As far as the relay..you got me there..
 

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1983 W126 280S, 1988 W124 300CE, 1991 W124 E300, 1995 W124 E200
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203 Posts
Old thread guys but can anyone guide me where the kickdown relay is installed ??
any pictures would be great.
Does it only work for the kick down button ??
My button is also not working.. I think
 

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1993 300CE Cabriolet (mine) ; 1994 E320 Wagon (wife's) ; 1990 Benz 300E 2.6 (son's)
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6,847 Posts
there is no 'kickdown relay'. on 86-89 cars the fuel pump relay N16/4 has an output thats 12V if the engine is less than 5300 RPM, this goes to the normally open kickdown switch S16/6, and the kickdown switch goes to the kickdown solenoid Y3. on 1990-92 cars, the fuel pump relay is replaced with the MAS N16. Y3 is on the 'right rear corner of the transmission'.

on 1990-1991 cars, there is a 'transmission upshift delay relay' K29, this is controlled by the CIS-E ECU N3, and in turn controls the Y3/2 upshift delay solenoid valve. Y3/2 which is on the left side of the transmission.

in 1992, the CIS-E ECU N3 directly drives an upshift delay switchover valve Y3/3, behind the brake booster.

1993 M104.99x is different yet again.
 

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1993 300CE Cabriolet (mine) ; 1994 E320 Wagon (wife's) ; 1990 Benz 300E 2.6 (son's)
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6,847 Posts
but all that applies to US models. europe/asia/world market cars are different in many little ways.
 

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1983 W126 280S, 1988 W124 300CE, 1991 W124 E300, 1995 W124 E200
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203 Posts
but all that applies to US models. europe/asia/world market cars are different in many little ways.
I also have similar symptoms as the previous posts. My car doesn't upshift until I let go of the pedal a little. Also the kick down button doesn't do anything. How do I figure out where the fault is ?

Kickdown button does make a clicking sound.
 

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1993 300CE Cabriolet (mine) ; 1994 E320 Wagon (wife's) ; 1990 Benz 300E 2.6 (son's)
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6,847 Posts
maybe the upshift retard mechanism is broken. thats right where the throttle pressure cable connects to the transmission, on the side.
 

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1983 W126 280S, 1988 W124 300CE, 1991 W124 E300, 1995 W124 E200
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203 Posts
maybe the upshift retard mechanism is broken. thats right where the throttle pressure cable connects to the transmission, on the side.
722.358 is the transmission
I looked it up online and it has one vacuum only or maybe I understood it wrong
I cant see anything on right side of the gear and I'd have to take it down if there is a vacuum connection on that side and I would be really happy to do so if there is supposed to be one

Is there any picture or diagram we could verify from ?
 

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1993 300CE Cabriolet (mine) ; 1994 E320 Wagon (wife's) ; 1990 Benz 300E 2.6 (son's)
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6,847 Posts
the vacuum control for upshift retarding goes into this plasic box on the side of the transmission where the throttle pressure cable goes in. that box effectively 'tighthens' that cable when its told to retard downshifting, normally just a minute or so when the engine is cold, but if that mechanism is broken, then it could be jammed in the retard position.

I think this picture is the wrong but similar transmission, your mechanism probably looks a little different. both the bowden cable from the throttle, and the vacuum line from the Y3/2 solenid valve go here.

 

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1983 W126 280S, 1988 W124 300CE, 1991 W124 E300, 1995 W124 E200
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the vacuum control for upshift retarding goes into this plasic box on the side of the transmission where the throttle pressure cable goes in. that box effectively 'tighthens' that cable when its told to retard downshifting, normally just a minute or so when the engine is cold, but if that mechanism is broken, then it could be jammed in the retard position.

I think this picture is the wrong but similar transmission, your mechanism probably looks a little different. both the bowden cable from the throttle, and the vacuum line from the Y3/2 solenid valve go here.

That's what my 722.4 gear looks like. Are you sure it's the same for 722.3 ?
If yes then I'd bring down the gear to have access to this area. No vacuum is connected on this side for sure at the moment.
 

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1983 W126 280S, 1988 W124 300CE, 1991 W124 E300, 1995 W124 E200
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203 Posts
Have you adjusted the transmission control pressure to calibrate with the throttle?

http://www.w124performance.com/service/Index/Resources/27-110trans_Bowden_adjustment.pdf



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My kickdown cable is already set on the most loose setting. Cannot loosen it anymore to reduce the pressure. I am also thinking maybe the kickdown button is permanently pressed, as in connection. I removed the cable from the button behind the pedal and that did not make any difference and also when I press it by hand it makes a clicking sound. It doesn't do anything while driving. Makes the sound but doesn't effect the gear shift.
 

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'95 E300 DIESEL, '91 600SEL, '92 600SEL
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16,920 Posts
Remove the transmission and install a new pressure control cable, then readjust cable
 

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1983 W126 280S, 1988 W124 300CE, 1991 W124 E300, 1995 W124 E200
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203 Posts
Okay so I have been wrong... found a picture of 722.358 transmission online and it does have another vacuum on the cable side. I think I need to bring the gear down to plug it in.
 

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1983 W126 280S, 1988 W124 300CE, 1991 W124 E300, 1995 W124 E200
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203 Posts
soooo the mechanic managed to get his hand up without taking the gear down and plugged in the vacuum line.
We also adjusted the vacuum modulator and Bowden cable
shifting is perfect now but the kickdown button still doesn't work but I can live with that
 

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'95 E320, 221k miles, fair cond
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608 Posts
Did you check if the kickdown switch is faulty? Does your model have a Klima/kickdown relay?


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1983 W126 280S, 1988 W124 300CE, 1991 W124 E300, 1995 W124 E200
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203 Posts
How do I check if the switch itself is faulty ??

Id check if my other W124 also has same switch for kickdown with same connector.
Kickdown works in the other car so if connector matches its easy for me to swap the switches and try them out in other car.
If its not the same 04 pin connector then I need to figure out how to test it

how do I check if I have KLIMA Relay.
I was reading another thread and it said if I turn on the AC and rpm doesn't drop then my KLIMA is working alright so I didn't even consider looking in it
I am hoping its the faulty switch and reallyyyyy hoping its the same as my other car
 
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