W124 CE300 24 autobox failure

[Dimitris1969]

This morning I checked this morning and I got 30mph at 2000rpm and 20mph at 2000rpm which I believe it's 4th ans 3rd gears . I also tried the gear stick at position 3 and position 4 and it did respond.
What confuses me is the high rpm on the motorway. It should be lower than what I see.
Which switch you are referring to? I was not aware that there are fault codes stored in the obd1 . Mine has the 16 pin obd system.
Are there any schematics that I can download, similar to realoem for bmw,s?

Correction 1500RPM at 30MPH, which I belive its 4th gear. I will try to find an open road to try to get it to 5th (or 4th).

 

[ray_hennig]

Correction 1500RPM at 30MPH, which I belive its 4th gear. I will try to find an open road to try to get it to 5th (or 4th).

Firstly, put the E/S switch into the E setting. That should make gears change up sooner, at lower revs. Mine is in 5th before 50 mph.

From start-up, cold, I expect the first change, from 2nd - it starts in 2nd - to 3rd at about 3500 rpm because the system envokes a cat-cleating programme when cold. That's on mine and it's working as it should. You may not have a cat so may be different.

Yes, the 16 pole diagnostic socket enables one to read and clear codes. You need an LED blink tester. I can give you more details when I haven't spent a day trying to get my fibre connection reinstalled by Orange. After 5 days!!!

And you need the code lists that, again, I can send you when I'm less livid and drunk.

First thing to do is report again with the revs at various speeds so it's clear to my addled brain.

RayH

 

[ray_hennig]

I will try to find an open road to try to get it to 5th (or 4th).

I've just been for a drive. 50 mph at 2500 rpm - 4th gear.

50 mph at around (hjust under?) 2000 rpm - 5th gear.

To recap, this in a 1991 300CE-24 with 722.5 5-speed gearbox.

R

 

[Dimitris1969]

I've just been for a drive. 50 mph at 2500 rpm - 4th gear.

50 mph at around (hjust under?) 2000 rpm - 5th gear.

To recap, this in a 1991 300CE-24 with 722.5 5-speed gearbox.

R

Hi, I do get 50mph at 2500RPM which I belive its the 4th gear. no furhter changes and i have pused it to 60mph.

any ideas on how to rectify this issue?

 

[Dimitris1969]

Hello all.
I still get 40mph at 2000RPM, 50mph at 2500RPM and 60mph at 3000RPM. I dont get any more gera changes. How can I rectify the 5th geat problem?

That sounds very much like a faulty 4/5th switch. Exactly that happened to mine but 4th only returned after I'd cleared the fault code. Then the same would happen again.

I replaced the switch, cleared the code and all was well ever since.

You can clean the switches.

RayH

Hello Ray. Clean the switches? Where are the switches and how do you clean them? are they on the gearbox?

 

[ray_hennig]

Where are the switches

Under the gear lever you have the 4/5th switch and the E/S switch - at least, I do! It is worth cleaning both.

In fact, I landed up completely dismantling the E/S switch and restored it as a spare. You need to remove the centre console woodwork.

Oh, and get some good quality electrical contac vleaner, NOT standard WD40.

And use a blink tester to check/erase fault codes. Lots of stuff about that on the 'net.

R