Sticking solenoid or something more sinister?

[JCviggen]

Very interesting stuff - do report back!
What fascinates me most is that the procedure seems to work (if its not all between the ears) on different makes of car in the same way which is unusual.

Meanwhile I am trying to learn a few things about ME7.1
Finding a way to extract and flash the ECU looks fairly straight forward. Editing ditto...where I am drawing a blank is some sort of definitions file for our ECU version that would know what each block of data stands for exactly

Would love to eliminate my rear O2s myself, I hate dealing with tuners around here. I used to map the older Bosch stuff myself but M7.x is rather different.

[Shoppinit]

I'd like to find out more about the procedure before I try it. Just so I can see something concrete rather than rely on "feeling" especially since my tranny is a smooth as silk anyway.

I'm interested in your ECU dabblings. What are you using to read / edit the ECU?

[Shoppinit]

Has anyone got a bentley manual for the RS6? I think there might be some information in that judging by this comment in the vcds label file:

12,0,Dynamic Shift Program (Bentley 01-83)

Although, there seems to be a reset procedure here:

http://www.ross-tech.com/vag-com/cars/autotrans.html

This would make more sense that Audi would be able to do this using a VAS5051 rather than use a special tool, but that's just speculation on my part.

[JCviggen]

I'd like to find out more about the procedure before I try it. Just so I can see something concrete rather than rely on "feeling" especially since my tranny is a smooth as silk anyway.

I'm interested in your ECU dabblings. What are you using to read / edit the ECU?

I'll try it on mine, it's never been silk smooth. Also going by yutube vids of various RS6 it seems the speed with which the box shifts (especially 1-2 and 2-3) seems to vary with mine being at the slow end of the scale. Does a TCU remap change the shift speed?

For reading and writing to our ECU you can use NefMoto ME7 flasher http://www.nefariousmotorsports.com/forum/index.php you can use your ross-tech cable.
Editing the BIN file you can use TunerPro.
Both of these are freeware. Where it gets difficult is finding a .XDF file for TunerPro that gives you a lay-out of the ECU file rather than binary code. I have found a .A2L file for the RS6 which a file that holds all the info but it's a proprietary format that can only be used in combination with somewhat expensive tuning software.
Since I only want to change the rear O2 DTC ignore I may be able to find someone to do that for me though.

[marv8]

Thanks for the info gents, another big plus of having such a good forum and knowledgeable members (of which my technical skills would be a big fat zero on the tcu rating).

The garage that rebuild the box offer full service so not specialists per say, the have built a number of Audi boxes and had an a6 2.7 turbo in for a full strip down and rebuild. The big plus I guess is that the warranty company paid for the repair so will be going back to them if the issue is not resolved - sure the as have a wayof getting the money back!

Tcu would kind of make sense in a way - I noticed on my drive back yesterday that it kicks down from 5th to 4th under very light throttle the changes back up. Almost like it is confused and between gear ranges?

Will have a read of these links then give the garage a call, they have already spend £100's on solenoids and gallons of ATF so sure they want this sorted almost as much as I do!

[marv8]

Well tried the reset and the first few changes were nice and smooth - but afraid after a short run same meat different gravy!
I did notice on the links Shop posted one said after holding full throttle (without engine on) turn key to off, lift off pedal and leave key in for 2 mins. The other states the same apart from take key out? Only tried first option as that had the most results but guess mine is just fooked.......again!

Be interested to know if this worked for anyone else though.

Thanks again all will keep you posted!

[Shoppinit]

It definitely drove better fisha,thanks.
But again as 1-2-3-4 did around 2000rpms 4-5 waited till 2500-2600.
It wasnt waiting that much with older box.

Then later

Hi
Tried again this morning it was much smoother and did the right changes.
Thanks again for useful info.
Are these adaptable transmissions?If so i wonder what the driver is doing!

So maybe it takes a little while to adapt? Keep us posted.

[marv8]

Right got the car back again - almost a week late!

Gearbox has been back out, TC sent off checked and something (can't remember what) changed. Gearbox stripped and checked - nothing untoward (apparently) car given back to me saying it's been cured. Jumped in to drive off, got to the edge of the forecourt and guess what... Thud in to second! Drove back and said it's exactly the same, guy said "well in that case it can only be the valve body, we have changed every part of the gearbox showing any wear".

Basically p*ssed right off, took it to the garage whom claimed to have rebuilt numerous gearboxes, managed to get the warranty company to pay up £3k to get the box out and rebuild and 7 months later it's still not sorted!

I know I should have bitten the bullit and taken the car to Grizz or mrc but was assured these guys knew what they were doing. Will know better in the future.

What to do though - I honestly don't think the valve body is the issue - it was checked and had no cracks or apparent damage. The garage has had the money off the warranty company (and some from me). I am thinking about just going back to the warranty provider (RAC) and explaining but have a feeling as the paid out over 5 months ago they will not care!

Basic symptoms are a thud when changing between 1st and 2nd, 2nd to 3rd feels like the gear slips and is almost between gears and thuds up from 3rd to 4th. Any ideas?

Maybe I should just drive everywhere in reverse as it's fault free..........at the mo!

[Shoppinit]

Sorry to hear that. What a pain in the RS.

I know when the rebuild pack came from zf one of the clutch packs only had 3 plates in and mine had 5 I think? I believe when the garage checked with zf they agreed that 5 was a later upgrade to the box.

The box was never upgraded. The RS6 uses a similar box to other 5HP24A, but with uprated components. I can't help feeling that they are telling you little porkies.

Did you get to the bottom of this?

I don't think it's the valve body either. It sounds like the TC not working properly.

It's easier to understand why Audi will only swap the whole box rather than try to fix it.

[marv8]

Thanks Shop, dropped the car back off this morning and told them It's no use to me and I suggest they take it to a zf approved transmission specialist for diagnosis. Basically they have 7 days to sort it or I will completely flip out - not to mention the threat of legal proceedings.

In respect of the "upgrades" I can only tell you what I was advised (and as previously mentioned my technical knowledge in mechanical engineering is LIMITED). I was told the TC was built with updated components, it has an improved clutch drum and the adding of additional clutch plates (well within tolerances) - If this is right or not I just do not know!

Just found an interesting RR thread, one of the best write ups yet I feel - note the range rover uses 1 less clutch plate than the sister box in the x5

http://forum.landrovernet.com/archive/i ... 89983.html

I know ours is a beefed up version but surely it's pretty much the same part wise?

Will keep you in the loop, I agree it sounds like th TC on mine is not locking however given it's been cracked and rebuilt by zf twice in the past 1000 miles surely it could only be an error in fitting rather than part failure?

Fingers crossed I will have some news Monday - cheeRS

Ps this guy picked up a box for £50 on eBay - again I know they are not the same but huge price diff - I saw a knackered one of ours for £750 or good working order go for circa £2k!

[Shoppinit]

Really interesting tear-down Good link.

Surely someone in the trade could get a remanufactured ZF box for about 2 - 3k?

[Shoppinit]

Oh I see now. It's RRPhil who posted that from Rangerrovers.net.

We seriously need to get that guy hooked on RS6s

[marv8]

Seems to know his stuff, maybe RRPhil/bemble and Tozom8 should set up a business!
Also seems like he had the patience of a saint - not only to rebuild these boxes but with all the questions and calls for help following his write up.......thinking about emailing him myself