Mmatrix Neutral Newbie February 20, 2007 Share February 20, 2007 When changing from 2nd to 1st, there will always be a jerk. In auto mode, there will still be a slight jerk when changing from 2nd to 1st. And I notice that from 2nd to 3rd, the car will pull away slightly quicker just when the gear has been engaged. I've sent the car to C&C for servicing, but to no avail... Any 7G-Tronic users out there facing this problem? ↡ Advertisement Link to post Share on other sites More sharing options...
Sturtles 6th Gear February 21, 2007 Share February 21, 2007 (edited) Mercedes auto-transmission isn't jerk free, so it could have some jerks whilst changing gears. However, if its really quite bad, then you should go back to C&C to demonstrate the problem for them. Most they could do is probably to change the transmission fluid or re-program the ecu Edited February 21, 2007 by Sturtles Link to post Share on other sites More sharing options...
Vblaster_w211 2nd Gear February 21, 2007 Share February 21, 2007 (edited) True, Merc gears do tend to jerk, especially on hard acceleration. It's part of the design. Edited February 21, 2007 by Vblaster_w211 Link to post Share on other sites More sharing options...
Watwheels Supersonic February 21, 2007 Share February 21, 2007 It has to do with the programming software. Previously my dads Citroen C5 had similar problems but after uploading an updated software gear change is brisky and smoother. But still got the down shift problem which they cannot resolve. There's always the thumping feeling from 3rd gear to 2nd. I think the software incorporates the throttle and gear change hand in hand. I wonder why conti have these problems. Probably multi-speed gearbox is still in the tuning stage. The Japanese dun have these problems. @ least for Honda's 5 speed auto it's smooth. The previous models of mercs with 4-speed gearbox have no problems. I think it's still in the stage of perfecting the software. Link to post Share on other sites More sharing options...
Sapience Clutched February 21, 2007 Share February 21, 2007 is it a jerk coming from the gearbox or just pronounced engine brake? Link to post Share on other sites More sharing options...
Jonnybravo Neutral Newbie February 22, 2007 Share February 22, 2007 Mine's oso the same. This is because the gear ratio is too close (I Think). Live with it. Jon SLK 350 Link to post Share on other sites More sharing options...
Mmatrix Neutral Newbie February 23, 2007 Author Share February 23, 2007 (edited) Went for repairs thrice already and problem is not fixed. So, all Mercedes are like this? $300k for a car with transmission problem.. However, changing from 2nd, 3rd, 4th all the way to 7th and vice-versa are jerk-free. Its only 2nd to 1st... Its not hard acceleration or pronounced engine brake. It only happened when braking and when the gear shift from 2nd to 1st. It will lag awhile then the huge jerk comes after it. It feels like the clutch is thrown thoughtlessly (manual description). I do hope some other 7g-tronic users may speak up... Edited February 23, 2007 by Mmatrix Link to post Share on other sites More sharing options...
Chickenbackside 1st Gear February 23, 2007 Share February 23, 2007 Sounds like the transmission software isn't well-written. My car (BMW) had the same problem when slowing down to a stop and when it's shifts from 3rd to 2nd (all BMW's start on 2nd gear unless in Sports mode), there will be a jerk. Did some research and found out it was an issue. Called PML and booked my car in for a transmission software reflash. 5 mins with a computer and problem disappeared... Link to post Share on other sites More sharing options...
Sevnrg Neutral Newbie February 24, 2007 Share February 24, 2007 When changing from 2nd to 1st, there will always be a jerk. In auto mode, there will still be a slight jerk when changing from 2nd to 1st. And I notice that from 2nd to 3rd, the car will pull away slightly quicker just when the gear has been engaged. I've sent the car to C&C for servicing, but to no avail... Any 7G-Tronic users out there facing this problem? its seems that this is quite a common problem for early batches of CLS. do a search in bmwsg Link to post Share on other sites More sharing options...
Vblaster_w211 2nd Gear February 24, 2007 Share February 24, 2007 This early problem with 7 Gtronic is discussed at MBWorld. A new gear firmware is avail to resolve it. Link to post Share on other sites More sharing options...
Mmatrix Neutral Newbie February 25, 2007 Author Share February 25, 2007 How new is gear firmware? Cause my vehicle just went for repairs last 2 weeks and its still not fixed.. Link to post Share on other sites More sharing options...
Fckes Neutral Newbie April 10, 2007 Share April 10, 2007 its engine brake lah! Link to post Share on other sites More sharing options...
Porker Turbocharged April 10, 2007 Share April 10, 2007 True, Merc gears do tend to jerk, especially on hard acceleration. It's part of the design. Not trying to start a war here and not blasting the Merc brand but if its part of the design... the designer or the design is really stupid. People want seamless shifting especially for slush boxes and not jerky shifting. Just my opinion Link to post Share on other sites More sharing options...
Passion 5th Gear April 10, 2007 Share April 10, 2007 Auto car where got engine brake as compare to manual car?You got drive both auto and manual car before or not?Auto car should stop without jerk.Think the programming got problem.It kicks down the gear too early thus causing the jerk. Link to post Share on other sites More sharing options...
Vblaster_w211 2nd Gear April 10, 2007 Share April 10, 2007 Did they flash the new firmware? May not have done so if they think it's not applicable or regular servicing. It's like motherboard BIOS - many people don't flash to update. Link to post Share on other sites More sharing options...
Miketow Neutral Newbie April 12, 2007 Share April 12, 2007 My old Ford Mondeo used to have jerky downshifts fron 2nd to 1st...and that happened periodically with no pattern of use - strange to see it still exists in the most technologically advanced gearboxes today. hope you get it resolved soon. Cheers. Link to post Share on other sites More sharing options...
Seanboi 1st Gear April 12, 2007 Share April 12, 2007 u sure all BMW starts on 2nd gear? My fren's 525 starts on 1st gear leh... Link to post Share on other sites More sharing options...
Wilb Clutched April 12, 2007 Share April 12, 2007 Can try http://www.sgcarmart.com/directory/merchant.php?MID=10631. If i remembered correctly, they do have a free check. ↡ Advertisement Link to post Share on other sites More sharing options...
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