[bullyboy112]

Hi Guys,

I have just bought a 2000 R170 SLK320, and it when I am in Drive, if I push it to the left, it does not go in to manual mode. It shows a 4 on the dash, then goes immediately back D. Any ideas what might cause this problem?



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[M4rCu5]

I have just bought a 2000 R170 SLK320, and it when I am in Drive, if I push it to the left, it does not go in to manual mode. It shows a 4 on the dash..

That is manually selecting 4th, push it left (-) again and it'll go into 3rd but will not hold the selected gear if you overrev the engine i.e. mine will do about 85mph in 3rd before it changes up to 4th by itself

.. then goes immediately back D. Any ideas what might cause this problem?

Might have to call in our resident guru @Dave2302 but is "W" or "S" selected? Seriously doubt that you're overrevving in 4th 🙃

 

[BaD_81]

So we agree it is not manual (like manual gearbox) it is a limiter up to selected gear and that will be ignored when one's foot reaches the carpet?

 

[M4rCu5]

So we agree it is not manual (like manual gearbox) it is a limiter up to selected gear and that will be ignored when one's foot reaches the carpet?

Yes, if you're in say Manual 3rd, flooring the pedal will scoot you up to the tacho redline @ 6k revs (rather than bringing in the kickdown which it will do if you're in "D") and will then change up whether you want it to or not. I tried to hit the ton in mine and it wouldn't have it in 3rd because it insists on upchanging to 4th thus depriving me of 5secs or so whilst it sorts itself out
I suppose you could call it a semi-manual gearbox? Inasmuch that you can do whatever you want with the tip-tronic and if the car agrees with you, that's fine, if it disagrees with you it's self-protecting🙃

The Manual 'boxed 200 of mine on the other hand is self-protected by a fuel interrupt @ 6200rpm and is really easy to hit during spirited overtaking manoeuvres ~ I do believe that the V6 also has this feature but let's be right, you're not going to hit it with the 722.6 'box


Quite why @bullyboy112 's is going immediately back to D from 4th still remains a mystery

 

[LeonardoDaBenz]

Hi Guys,

I have just bought a 2000 R170 SLK320,

320 or 230?? Your profile says different. or ???

 

[bullyboy112]

Hi its a new purchase SLK320. When I pull the auto box down to drive. There is a + - and if I click it to the left it shows gear for, but almost instantly goes back to D. I have it on sport mode when trying this. Apologies, I did have a SLK230 before. Thanks for all your comments and help


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[bullyboy112]

I'm using it for engine Braking, and not over revving the engine. I have done some research and It is electronic controlled rather than mechanical.

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[LeonardoDaBenz]

Updated profile for you

 

[bullyboy112]

Updated profile for you

Thank you very kind.

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[Dave2302]

Pure guesstimate as I would need to verify with TCU Data on SDS, but I'd say your Shifter has a defective microswitch, i.e. stuck in + all the time, hitting - makes it go down but as soon as you release Shift Lever it pops back to D as the + side is stuck.

 

[bullyboy112]

Pure guesstimate as I would need to verify with TCU Data on SDS, but I'd say your Shifter has a defective microswitch, i.e. stuck in + all the time, hitting - makes it go down but as soon as you release Shift Lever it pops back to D as the + side is stuck.

Thank you that makes sense


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