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2.7HDi V6 Auto Gearbox Jerky Shifts |
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David K |
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Joined: Jan 30 2010
Member No: #42
Location: Scania |
I have to say I'm deeply impressed by your enthusiasm and encourage to solve your issues with your C6. You must have had every single possible issue that a C6 can offer by now, and still you just solve the problems and continue to love your car. So a big thumb up for you smihaialex and good luck with your oil change! |
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magicands |
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Joined: Sep 13 2012
Member No: #1021
Location: Coventry, Warwickshire |
I agree with the above completely. I never knew that I lived in another world with my Vauxhall Omega as it never gave me any serious problems throughout my 10 year ownership, and yes, it never had an auto box oil change in all that time. Strikes me that the C6 limps from one EXPENSIVE disaster to the next and yet people will resolve the issues as and when they appear because, and I don't think I am wrong here.......we all own a car that very few people ever see on UK roads? |
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Kaloteck |
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Joined: Apr 25 2013
Member No: #1271
Location: Warsaw |
David K wrote ... I have to say I'm deeply impressed by your enthusiasm and encourage to solve your issues with your C6. Hey, what did you expect, it is love, that's what it is |
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joaoproenca |
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Joined: Dec 05 2013
Member No: #1510
Location: Portugal |
From what you describe is a problem on control valves nothing to do with ECU. ECU barely broken and if so you can rebuild it consult this company - Click Here - |
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yellowtextmarker |
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As an oil change just changes a portion of the fluid you might check for companies which can change 100% of the fluid AND clean the gearbox. In Germany such garages are available for the boxes used in our C6 - check this link and try to find your solution: - Click Here -. Good luck and drive! Yellowtextmarker |
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smihaialex |
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Joined: Sep 18 2012
Member No: #1031
Location: Bucharest |
Thank you for your kind words and recommendations guys... Yes! It is love... Without a shadow of a doubt I've been trying to find a company that does auto gearbox flushing in Romania, but so far to no avail... And driving to Germany for this is not really an option right now... I'll keep looking and in the mean-time do another set of 3 partial oil changes... I'll also be sending the instrument cluster to BBA Reman for repair... Other than that, I just had my C6 go through the 2-year mandatory technical inspection and everything is OK - not even minor notes... In March I plan to change brake fluid, coolant fluid, oil, filters, brake pads & discs (if necessary), and also fit new windshield wipers... and, if necessary, do a 3rd set of 3 partial ATF changes, and I should be good to go for another 1-2 years Yours, Sam |
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gmerry |
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Joined: Dec 11 2009
Member No: #21
Location: Scotland |
Sam, don't discount the value of doing multiple changes as you are planning (compared to a flush change). So long as the car is run up to temperature between each partial change, you will achieve practically the same result (ie dilution of wear particles and restoration of the fluid viscosity and friction additive) at a cost of the fluid alone (assuming your own labour is free). Also, doing it yourself, you are totally in charge of cleanliness and introduction or not of any foreign dirt. Regards G PS, the term flush is a bit of misnomer when talking about hooking up to an external oil change machine. The internal flow velocities/temperatures within the box will not be any different hence it is not really a flush. PPS here's the dilution status after each partial change Oil Dilution Status dirty (litres) clean(litres) % dirty beginning 7 0 100.00% after 1 change 4.1 2.9 58.57% after 2 changes 1.698571429 5.301428571 24.27% after 3 changes 0.703693878 6.296306122 10.05% after 4 changes 0.291530321 6.708469679 4.16% after 5 changes 0.120776847 6.879223153 1.73% after 6 changes 0.050036122 6.949963878 0.71% |
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smihaialex |
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Joined: Sep 18 2012
Member No: #1031
Location: Bucharest |
Thanks G, I did a lot of research and you are right - when I initially heard about the flushing technique I thought it involved running of some cleaning fluid at high velocity through the gearbox, but in fact it just involves sucking the old fluid via vacuum and pumping in new oil - not a lot of actual flushing, but it does save some time Cheerios, Sam |
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gmerry |
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Joined: Dec 11 2009
Member No: #21
Location: Scotland |
Hi Sammy, correct. The only thing it saves is time, which equals money if you are doing these daily and making a living from it. That's why an auto shop will use a machine. If you are capable of doing the job yourself, it then comes down to cost (ie cost of driving to the shop, plus paying for the job versus your own time value). For me, the cost/time of driving to a shop far outweighs my own time value of doing the job. In addition, I'll schedule in some other maintenance while I'm doing this job (oil change, air filter change, fuel filter change) so making most use of my time. If I had a shop on my doorstep that I was 100% happy with regarding fluid cleanliness/hygene, I might reconsider. Please note that the machine just fits in place of the oil cooler (which is only a bypass device anyhow, so a flushing machine cannot achieve 100% fluid changeout either). Regards |
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smihaialex |
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Joined: Sep 18 2012
Member No: #1031
Location: Bucharest |
Anyways, after my last post I started searching again for specialized auto gearbox repair shops and this time I found three... I called each and everyone of them just to get a feel for their expertise:
and surprisingly they all have done C6s, they know AW boxes very well, not necessarily from C6s, but from Peugeot 407s, Opel/Vauxhal Insignias, Volovos etc... What I found out was very surprising to say the least:
Bottom-line:
And after that, I will have a brand new gearbox, slip, hunting and shock free, hopefully... If not, reconditioning the gearbox is a whole new headache - almost 2000 EUR but hopefully that won't be the case... What do you think? Cheerios, Sam |
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gmerry |
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Joined: Dec 11 2009
Member No: #21
Location: Scotland |
You are on the right path. Regards G |
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cruiserphil |
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Member No: #38
Location: Celbridge |
Sam, Nice info. Many thanks. Phil C. |
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gmerry |
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Joined: Dec 11 2009
Member No: #21
Location: Scotland |
Hi, for UK forum members, Sussex Auto Transmissions has brand new AM6 valve bodies in stock at less than £500 plus VAT. There are various tricky aspects to removal of the old body and replacement by the new, especially with regard to disconnecting the manual valve and refilling the valve body with fluid. So make sure you choose your shop/technician with care. There is also a need to reset the ECU back to new condition so that the transmission can recommence the learning process *it will have been compensating for valve wear* Regards G One aspect that emerges is that a lot of the valves are dynamic, operating at 300Hz so there is a lot of wear potential. |
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smihaialex |
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Joined: Sep 18 2012
Member No: #1031
Location: Bucharest |
Gentlemen, I'm happy to report that the car is in the shop as we speak... The prices are similar, my hydraulic block cost 650 EUR + VAT which is almost exactly 500 GBP + VAT Another piece of info - on Volvos and Insignias this gearbox has a flow pipe and a return pipe and it uses the car's radiator for cooling, but on the C6, as well as on the Pugs there's a small dedicated radiator mounted on the gearbox itself, no pipes... This means that you can only do multiple partial changes, if you don't want to take the radiator off the gearbox... I'm going to go get my car back in one and a half hours or so and I'll report back with the first roadtest results. Cheerios, Sam |
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David K |
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Joined: Jan 30 2010
Member No: #42
Location: Scania |
How did it work out? Any improvement? |
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