[W126 Coupe] lazy transmission

[Markus Meyer]

Hi Vance,

Not sure who is debating changing the torque converter fluid, but, if you
can do it, you should.  Some cars don't have a drain plug for it, then you
have to figure out how to do it, flushing being one way.

Anyhow, I'd drain tc and pan, replace all fluid.  You can still add some
reconditioner if you want, I forget which one Jonathan likes and has
recommended in the past, maybe Lucas, but don't me on that.

I personally use Amsoil products, their synthetic ATF has done well for me.

Markus
2009/12/19 Vance Rowley <vance_rowley at hotmail.com>


> Hi Markus,

>  I am probably due for a change and intend to get it done, although there

> is no burn smell from the existing fluid.

> Is there a particular brand of synthetic that you would recommend?

> I have been putting this off for quite a long time now. Main reason being,

> after the last time I had it done, I finished up with shift problems worse

> than I have now. To cut a long story short, after several visits back to my

> local MB service centre (with no results) I gave up. Then one day while

> searching for something around the house, I came across a bottle of

> Transmission Reconditioner which I forgot I had as part of a package I

> bought sometime in the past. I thought (can't do any harm) and dumped it in.

> About a week later, the transmission suddenly started working perfectly, and

> has done until recently.

> You can probably see my way of thinking and reluctance to getting a fluid

> and filter change, as this would mean the Transmission Reconditioner I put

> in (which I forgot the brand) would also be drained off. Although I

> discovered the last time I had it done, the torque converter was drained

> also, which I believe is the correct procedure. (could this have been the

> cause of the original problem?) I believe there is a hot debate going on

> whether or not to have the TC drained.

> So, should I go ahead and have a complete fluid and filter change with TC

> drain, or just try the fluid and filter without bothering with the TC? Your

> thoughts (and anyone else's) are greatly appreciated.

>

> Cheers,

> Vance.

> ------------------------------

> Date: Fri, 18 Dec 2009 11:27:51 -0500

> From: markusfmeyer at gmail.com

> To: vance.rowley at thestart.eu; mbcoupes at mbcoupes.com

> Subject: Re: [W126 Coupe] lazy transmission

>

> When is the last time you changed your trans oil and filter?  If more than

> 25-30K miles ago, its time.  I found when I switched all my vehicles over to

> synthetic they responded quite well and shifted better, your experience may

> vary.

>

> Markus

>

> 2009/12/18 Vance Rowley <vance_rowley at hotmail.com>

>

> Not heard from anyone in a while. Had problems with my email, so changed

> it.

> Anyway, getting back to the subject, I have recently been having what I

> would call lazy shifting with the transmission. There is no slipping and

> seems fine on starting off as normal (in 2nd as it does) and also seems fine

> by flooring it to get 1st and then back to 2nd. But then (under

> normal acceleration) it can't seem to make up it's mind when to shift to

> 3rd, although this isn't as bad as it is from 3rd to 4th. Even after

> reaching a constant speed of say 30mph in 3rd (and the E/S switch set at E)

> most of the time it will just stay in 3rd and not drop into 4th. Sometimes

> it will, but most of the time I have to blip the throttle a little, then

> ease off for it to drop into 4th. Sometimes even this doesn't work.

> Summary is all downshifts seem fine and upshift from 1st to 2nd is perfect.

> Upshift from 2nd to 3rd is OK most of the time, but upshift from 3rd to 4th

> depends on what mood it's in at the time.

> Should I just change my tranny fluid and filter, or is there some other

> explanation for this?

>

> Cheers,

> Vance

> 91 560sec euro

>

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