E320 94 limp mode
 

Got a problem and a few questions. To start off with, our kick down switch went off or broke. We removed it and tried driving, car drove great, then car went into limp mode. I gather limp mode is to protect the transmission. One prob was a friend decided I needed more tranny fluid, well it made the fluid overfilled. So my son drained some out. It didnt help. The car would get up to speed then just die down, not keep up the speed. Has high RPMS when you try to drive it up to hwy speed. It worked great one day next day it didnt.

Question 1: is that because we didnt replace the kick down switch
Question 2: did overfilling the tranny cause this
Question 3: can someone tell me how to reset the tranny for the 94 E320 (W124
Question 4: can this be fixed and do I need to replace the kick down switch to reset the tranny
Question 5: Will replacing the kick down switch help with the Limp Mode

As I said the car wont keep steady speed. Will get up to hwy then just die down. PLS HELP or this car is going to the auction on Tues. I would miss this car, has a grea 6 motor, so quiet

HELP:mad:

'94 is going to be a mechanical transmission. There is no "limp mode" because there is no computer or electronics involved. If the kickdown switch has failed, the solenoid on the transmission jammed, or you have shorted wires somewhere, you will get very high RPM's between shifts, assuming it shifts at all. It's highly unlikely that overfilling caused this, verify that the fluid level is correct because LOW fluid level certainly can cause problems.

Kick down switch tyvm 4 response
 

Ok no limp mode for my car. My son will check the solenoid (howver u spell that). I guess when the kick down switch got stuck in the carpet, it might of did something to that selenoid. We drove it without kick down switch guess that is bad to do. Thank you so much for your help. Oh am I right no kick down switch didnt help car out.

ASR
 

Limp on that chassis is ASR module controlled.

Is the car ASR equipped?

Kick down switch tyvm 4 response
 

what is ASR dont know what that means

ASR
 

Anti Slip Regulation.

The Engine computer is tied to the ASR module for Traction control of the rear wheels.

If a fault occurs, the car goes into Limp Mode and cuts engine RPM,s.

You can tell if your car has the ASR feature [ it was an option ] by looking at the speedo with key ON.
Is there a yellow lit triangle in the middle of the speedo on your car?

If YEs, then you can access the ASR codes under the hood and clear the offending code.

One of the codes is kickdown fault.

ASR we dont have
 

Our card is pre obd2 it has a self check. Similar to an 88 ford. Only code it gives is 3 and 5 oxygen sensor and egr. Nothing to do with shifting. For the first mile car shifts great then goes into its mode. Heard it could b the solenoid switch and the missing kick down switch. There is a way to check the solenoid on the transmission right. I looked up parts for the kick down switch and the solenoid. The solenoid is a long kinda part color was a gold color. Not sure if this is the right thing, but found another kick down switch. Can the removal of that switch b the cause??? thanks for the help

Oh will check and see if there is a yellow triangle on the speedo with key on. Will check that tomorrow thks again

What do you mean by " die down " ? Does the engine slow down or does the car slow down and the engine RPM stays high?

If this is an ASR problem, the engine RPM will go low.

If the engine is losing power due to a fuel or ignition problem and you are harder into the throttle, the trans will shift late.

If there is a transmission slipping problem, the RPM will go high.

It is critical to get an accurate description of the problem. What is the history of this car? How long have you had it? Was this new problem that suddenly occurred or did it slowly get worse over time?

Prob with tranny E320
 

We can drive for a few miles at regular speed, then all of a sudden it gets high rpms and lower speed. Dont think its ASR. Car drove great, until the kickdown switch got stuck in the carpet. We removed it and car drove great for a few days. Now it does this high rpms and lower speed, it down shifts when it wants to usually after a few miles. The history of the car, I just bought it a month ago, we changed radiator and fan belt. So the problem just happened after the kick down switch was removed. We put it back in under the pedal. Still not running great. A friend cleaned out the filters and he drove it said it drove 90 mph down the road no problem. When we get in to drive it normally not racing it. We slow downed to turn onto the highway and it did the same thing, darn car. CAR SLOWS DOWN RPMS HIGH. thks for any help

Have a look at the application chart in the post below. If you have a 722.3 / 722.5 trans, might be losing the K2.

http://www.peachparts.com/shopforum/diesel-discussion/393877-722-3-elements-relation.html


Loss of governor pressure will cause uncommanded down shifts. This was common on GM TH 350 / 400 trans due to governor bore wear. I'm not sure if this is possible on your trans.

There may be a similar problem like this guy.

http://www.peachparts.com/shopforum/tech-help/393905-e320-downshifting-unexpectedly.html

Suspect is the B2 piston . Very common on that trans.

Next time it does it. put it in N. ....gas it a few times , and then drop it back in gear.
If it clears, you most likely have a bad B2 piston

Can be changed from outside the trans, but tight.

The reason I ask about ASR before continuing is b/c on an ASR car, a simple tire inflation or mis-match of tires will cause the car to limp mode at speed. The ECU looks at all 4 wheels for same diameter .
Be nice if you could confirm ASR ...YES/NO.
That chassis has Electronic Accelerator and the diagnosis is completly different from Non ASR .

Also, you have OBD1, and EA codes will be stored in pin #14, not Diagnostic N59 module.

On your o2 sens/EGR codes . the DM looks for a lean read from 02 sensor when the car does egr self test..... if it does not see it, it brings on the EGR fault...
Meaning the egr code is being triggered by a slow/bad 02 sensor, not the egr.

Most egr faults on 104 engines is tubing blockage at head, but when it is coupled w/02 code, one want to check 02 duty cycles and Voltage..specially lean [ low V ]

Tnx for informing me on what kind of Diagnostics that chassis uses. Nice to know this stuff..........

wow alot to take in, My son is my mechanic. He is new to mercedes engines etc. I will have him read all this and it will make sense to him I hope thks. Dont have ASR that is what my son said. darn wish I did.

My son he put in N, gassed and put in gear it didnt clear so mabye not a B2 Piston. We dont have ASR, that yellow triangle in the middle of the speedo.