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C4 with EGS - Fixed the juddering when taking off

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Lars of Sweden   
Mon Jul 19 2010, 04:10am
Member No: #1177
Joined: Sep 26 2007
Location: Jonkoping
This weekend was spent calibrating the EGS gearbox. I recently talked to the garage about the juddering at take-off and they said that I should calibrate the gearbox. Since I have a Lexia I could do this myself, but if you do not, ask your garage to calibrate the gearbox if you have problems with juddering and you have the EGS box.

In short for those of you who have a Lexia:

Do this with a cold engine from the start and somewhere you can drive short lengths without disturbing someone!
Run a diagnostic on the whole car.

Choose gearbox computer, delete any errors (first read out errors).

Select the last item on the list (since I have a Lexia in Swedish I'm not sure what it says, something like "parameters").

Choose "switch/change gearbox computer" and run the calibration.

Follow the sections you see, it will start by calibrating the position of the gears, followed by the power need for the clutch.

When the calibration of the "pull position" (not shure what it's called in English), keep the Lexia connected!

Start the engine and let it get warm (over 70 deg Celsius). Do four calibrations in a row without stopping the engine.

Use Auto-mode! Start off by accelerating with around 40% throttle and get over 15 km/h, brake when 15 has been reached (do not stand on the brake pedal!).

Repeat four times. Leave the engine running for at least 1 minute, then repeat four calibrations again, this time stop the engine after you are ready.

You can disconnect the Lexia now. After one minute test driving the car for a few kilometers. In the beginning my felt like it was hesitating when changing gears but this disappeared after a few km!

The result in my car is a whole new car! Almost all juddering is gone, the only time I can feel some is when starting downhill.
7 User said Thank You to Lars of Sweden for this Post :
  (13 Jun 2011 : 07:30) ,  (28 Mar 2012 : 10:54) , BigJohnD (16 Apr 2012 : 08:43) , bunja (03 Jan 2013 : 03:01) , chris178 (16 Apr 2013 : 10:01) , gregorneasden (08 Nov 2013 : 15:13) , noodles63 (05 Sep 2016 : 04:11)
Biohead   
Mon Jul 19 2010, 04:28am

Member No: #6049
Joined: Nov 05 2008
Location: Bracknell
That's a nice find that Lars! I'm sure it will help some people.
Lars of Sweden   
Mon Jul 19 2010, 09:29am
Member No: #1177
Joined: Sep 26 2007
Location: Jonkoping
Hi Biohead, since you have a Lexia, when someone wants to try it out, could you check out the names for the menues etc?
Biohead   
Mon Jul 19 2010, 10:44am

Member No: #6049
Joined: Nov 05 2008
Location: Bracknell
I certainly will Lars.

I would try it myself but I don't have an EGS box so can't access those options.
hertsnminds   
Tue Jul 20 2010, 03:16am
Member No: #1276
Joined: Oct 09 2007
Location: Scotland
This sounds like the type of procedure that would have to be done every once in a while (rather than a one off) similar to defragmenting a disk drive to keep it running at its best.

I suppose things like clutch and gear wear will effect this, so how often would you think this needs to be done, once a year during the annual service or more/less often?
Lars of Sweden   
Tue Jul 20 2010, 07:48am
Member No: #1177
Joined: Sep 26 2007
Location: Jonkoping
I would agree, about a year between seems fine, but depends on how far you drive per year. My car has done a bit over 40000 km since new (around 10000 per year that is, since I have another car for my work trips).
Jips   
Sun Apr 24 2011, 10:54am
Member No: #4184
Joined: Jun 20 2008
Location: Neath, S.Wales
I finally plucked up the courage to have a go at this (And was bored on Easter Sunday!!!)

After about 3 attempts and a little help from Lars I have made up this PDF: - Click Here -

Hope it helps. I think I have got everything in the right order. Certainly made a difference to my car
2 User said Thank You to Jips for this Post :
 willfishwick (28 Apr 2014 : 14:12) , toobob (23 Jun 2014 : 05:13)
pellel   
Thu May 12 2011, 03:22pm
Member No: #13582
Joined: May 05 2010
Location: Uppsala
This sounds great. First time I'm hearing about Lexia. Where can I find it / buy it? Are there some software I need and how do I get that? I found a lot of different models on ebay, can anyone please guide me? Lars of Sweden, you can write to me in swedish if you like.
Dave_Retired.   
Fri May 13 2011, 12:30am

Member No: #1
Joined: Aug 07 2006
Location: Northumberland
Probably one of the better sellers is here: - Click Here -

Comes complete with software
1 User said Thank You to Dave_Retired. for this Post :
 Picassofan (15 Jun 2013 : 02:14)
BigJohnD   
Fri May 13 2011, 04:13am

Member No: #82
Joined: Jan 22 2007
Location: Hoylake
And requires WinXP or earlier…
Jips   
Fri May 13 2011, 04:31am
Member No: #4184
Joined: Jun 20 2008
Location: Neath, S.Wales
It also will run in Windows 7 if you download XP mode which is a virtual machine and free
1 User said Thank You to Jips for this Post :
 BigJohnD (13 May 2011 : 04:47)
Dave_Retired.   
Fri May 13 2011, 05:33am

Member No: #1
Joined: Aug 07 2006
Location: Northumberland
Jips wrote ...

It also will run in Windows 7 if you download XP mode which is a virtual machine and free

Have you actually done that to prove it does?
Jips   
Fri May 13 2011, 07:54am
Member No: #4184
Joined: Jun 20 2008
Location: Neath, S.Wales
Yes, mine runs on my works laptop, with XP mode on it.
1 User said Thank You to Jips for this Post :
 Dave_Retired. (13 May 2011 : 09:03)
Dave_Retired.   
Fri May 13 2011, 09:03am

Member No: #1
Joined: Aug 07 2006
Location: Northumberland
Jips wrote ...

Yes, mine runs on my works laptop, with XP mode on it.

Thanks, it's good to have it clarified as there are many misleading comments out there
Jips   
Fri May 13 2011, 09:19am
Member No: #4184
Joined: Jun 20 2008
Location: Neath, S.Wales
All you have to do is pass through the unknown usb device, then start up lexia.

Saves having it mess up everything else on the main laptop as it does have a tendancy to take over.

In the picture, Unknown Device would appear with the other items in the drop down.

If I attach the other items, I can also use it as a touch sensitive Lexia which is cool, but no easier



2 User said Thank You to Jips for this Post :
 chef761953 (05 Jul 2015 : 05:51) , robcris (03 Sep 2016 : 05:43)
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