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C4 with EGS - Fixed the juddering when taking off |
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Lars of Sweden
 
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  Member No: #1177
Joined: Sep 26 2007Location: 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. |
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Biohead
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    Member No: #6049
Joined: Nov 05 2008Location: Bracknell |
That's a nice find that Lars! I'm sure it will help some people. | ||||
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Lars of Sweden
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Member No: #1177
Joined: Sep 26 2007Location: 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? |
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Biohead
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Member No: #6049
Joined: Nov 05 2008Location: Bracknell |
I certainly will Lars. I would try it myself but I don't have an EGS box so can't access those options. |
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hertsnminds
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  Member No: #1276
Joined: Oct 09 2007Location: 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? |
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Lars of Sweden
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Member No: #1177
Joined: Sep 26 2007Location: 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). |
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Jips
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 Member No: #4184
Joined: Jun 20 2008Location: 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 |
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pellel
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  Member No: #13582
Joined: May 05 2010Location: 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. | ||||
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Dave_Retired.
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 Member No: #1
Joined: Aug 07 2006Location: Northumberland |
Probably one of the better sellers is here: - Click Here - Comes complete with software |
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BigJohnD
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 Member No: #82
Joined: Jan 22 2007Location: Hoylake |
And requires WinXP or earlier… | ||||
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Jips
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Member No: #4184
Joined: Jun 20 2008Location: Neath, S.Wales |
It also will run in Windows 7 if you download XP mode which is a virtual machine and free | ||||
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Dave_Retired.
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Member No: #1
Joined: Aug 07 2006Location: 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? |
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Jips
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Member No: #4184
Joined: Jun 20 2008Location: Neath, S.Wales |
Yes, mine runs on my works laptop, with XP mode on it. | ||||
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Dave_Retired.
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Member No: #1
Joined: Aug 07 2006Location: 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 |
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Jips
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Member No: #4184
Joined: Jun 20 2008Location: 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  |
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