clunking from the rear whilst moving between 'd' & 'r'

[nickh]

Hi

I get a clunking from the rear whilst moving between 'd' & 'r' when I am parking, should i be worried?

The 1992 230e (w124) has only just covered 80,000 miles, i,m sure I read somewhere on this forum it could be the "diff bushes", is this worth doing?

Since the sportline suspension is fitted, does this mean i would have different bushes than normal?

 

[Andy]

Hi

Try putting it into N for a second or so then into R & vise versa. There could be some bushes on the subframe or on the axle carrier that are worn. But you are probably moving from Dto R to quickly.

If this cures it OK. Otherwise get it checked out to be sure.


Regards

Andy @ www.mercedesservicing.com

 

[piestore]

harsh gear change

These cars had a great gearbox but they use vacum from the inlet manifold to control shift pressure (modulating pressure) it is very common for the servo to fail or for the Vac pipe from the manifold to fall off. Your dealer should not charge a fortune to check this out

 

[nickh]

hmmm interesting, I shall try both of your sugestions out and see what happens.

regards

nick

 

[Andy]

Hi

As a rule if there is a problem with the vacuum. You will experience harsh gear changes in all forward gears. The modulating pressure valve is there to give quality gearchanges.


Regards

Andy @ www.mercedesservicing.com

 

[GaryC]

Hello,

I also have this problem in my E300, also the harsh gear changes, how could we check the modulating pressure valve?

 

[piestore]

harsh gear change

only the very early 210 e class had this box you need to look at gearchange lever and the mode select button if your choice is W or S this is a 722.6 gearbox which is all electronic. If your choice is S or E this is the vac controled pressure box. On the left hand side of the box is a vac pipe leading to a plastic Vac pod you need to check that you have a vac supply down the pipe and that the vav pod holds Vac pressure. If this is OK check the colour of the vac pod as it is very common for the wrong one to be fitted. your local MB parts dept should be able to tell you the correct colour for your model> if all this appears to be ok you need to book in with MB dealer who will be able to check modulation pressure and adjust, donot try to adjust by trial and error because if Mod press is set to low damage will occour. this should only be 1 to 2 hours labour.

 

[piestore]

Hi just looked at you note I was assuming 210 your 124 would have this box

 

[Andy]

Hi all

Gary you have not said how old your vehicle is. As Piestore has said. Check which g\box is fitted to your vehicle. If your vehicle is a early vehicle. It may also have a valve fitted to the side of the injection pump. This regulates the vacuum to the gearbox.

If you are not sure what you are doing. As Piestore has said. Get into a dealer or Independant.


Regards

Andy @ www.mercedesservicing.com

 

[GaryC]

Firstly thanks for your reply!!

Oh, mind is a 1992 300E, automatic, with MB 103 Engine...

 

[Matt Crooke]

I used to get the irritating clunk when shifting from D to R and vice versa, but like andy says, take a little time shifting between the two and she shall clunk no more.....Works on my 190 anyway!

 

[Dave K]

Good information from Piestore about W210 early/later boxes I was just about to try and determine whether or not the box on my E300TD W210 is electronic or not. No need to bother now - thanks to Piestore I now know that mine is electronic. Which brings me onto my next project.

I'm willing to bet that the firmware (the software within the the electronic gearbox controller) has been revised over the years to iron out any glitches. I've had great success with updating the firmware in other cars with electronic boxes in the past which has made some dramatic differences. The best example was Vauxhall Senators (which have a superb electronic box - smoother than even MB or BMW). Does anyone know where the gearbox ECU is located in the W210? If I can locate a very late W210 and "borrow" the control unit chip and copy it, I may have a good upgrade to try.

Cheers.

 

[Matt Crooke]

Dave K

I had a Senator for a while, the 3 litre 24 valve model, and you are right, the occasional feeling you get of being tickled by a baby's eyelash is in fact the box changing gear. The one i owned had just over 200k on the clock and was still going strong. GM should have carried on making them to be honest instead of spoiling it all and producing the Omega.

And ever tried to out accelerate one?? its a pretty hard job!!

 

[Dave K]

Matt,

I've owned two 24v Senators over the past few years. Silky smooth gearbox, lovely straight six engine. Pretty rapid too. Just lacking a bit in the suspension department (typical Vauxhall problem). Yep - much better than the Omega. Just looked a little dated I guess. I shall miss them :roll:

 

[piestore]

clunk d to r

Hi

The gearbox ECU on 210's is underneath the passenger foot plate. It will be marked EGS OR ETC.

Beware EGS/ETS are coded to the vehicle and cannot be transfered from one to the other. You may be able to copy the chip but the vehicle code may also be transfered, you would know better than I. You also need to be careful regarding the valve block within the gearbox is only compatable with certian EGS/ETC control units so make sure you keep a backup that you can go back to. Yes the software and hardware was changed a lot in the early days and although the box is the same, engine viariants also have different software ( mapping ) Good Luck I would be interested to hear how you go on

 

[JR]

what a thread !!!!!
i had the the "clunking problem" on the old E300, and it wasn't any of the suggestions from our infallible team of technical people.
it was a worn doughnut which was available from the stealership as a repair kit (bolts included).
this caused the clunk between D and R and although its at the front of the prop sounds very much like it comes from the back.
its worth a look

merry chrimbo everyone, have a nice one