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disconnect battery overnight--now variant rpm...

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Old 04-28-2015, 06:09 AM
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Originally Posted by richard-tx
It really sounds like a module lost it's memory and now needs to re-learn it's settings.

It could also be that a module just didn't initialize correctly. I would disconnect the battery, touch the battery cables together to remove any residual charge, wait 5 minutes, then reconnect the battery.

been reading a lot about dangers of disconnecting battery.
seems things do have to relearn and can take up to 100 miles to do so is various driving conditions. I have not done this many miles yet
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Old 04-28-2015, 06:27 AM
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Originally Posted by allenst
been reading a lot about dangers of disconnecting battery.
seems things do have to relearn and can take up to 100 miles to do so is various driving conditions. I have not done this many miles yet
Things do relearn, particularly fuel and air systems and gearbox.

However they are never going to relearn properly with existing issues still unresolved.

Did you notice my post with all the manuals for download, i recommend you save them and get acquainted.
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Old 04-28-2015, 06:36 AM
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Originally Posted by haggisuk
Things do relearn, particularly fuel and air systems and gearbox.

However they are never going to relearn properly with existing issues still unresolved.

Did you notice my post with all the manuals for download, i recommend you save them and get acquainted.
I did see your manuals. Thank you.
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Old 04-28-2015, 09:46 PM
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Originally Posted by haggisuk

I think you need to have a good read through these and get an understanding of the various systems to then go fault find properly.




Electrical General
The above link is dead.
Last edited by richard-tx; 04-28-2015 at 09:49 PM.
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Old 04-29-2015, 06:37 AM
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Originally Posted by richard-tx
The above link is dead.
Try again because I just clicked the link in your reply on my iPhone and it works
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Old 04-29-2015, 07:14 AM
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Originally Posted by haggisuk
Try again because I just clicked the link in your reply on my iPhone and it works
On my computer it is a dead link.
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Old 04-29-2015, 07:26 AM
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Originally Posted by trustzzz
On my computer it is a dead link.
I just tried again, and it works on my PC, when clicked it starts a download, not open a web page

If it doesn't work for you then perhaps the hosting forum requires you register
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Old 04-29-2015, 07:46 AM
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Works for me, downloads just fine.
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Old 04-29-2015, 12:43 PM
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That's only item does not work and all of them working fine but this one !
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Old 05-22-2015, 09:36 AM
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Originally Posted by haggisuk
It was getting late for me yesterday and I never thought to look at your vcds scan.

The engine code i was asking about is BFM

I think you need to have a good read through these and get an understanding of the various systems to then go fault find properly.

BFM Manual

Electrical

Gearbox

Brakes

Communications

Electrical General

Electrical Systems

Fuel Supply

Fuel Supply

Maintenance

Ingnition System

Service Gearbox

A8 Technical Features

09E Gearbox Part 1

09E Gearbox Part 2
Im thinking that when I disconnected the battery it of course wiped the ecu which previously had made adjustments to the TB to compensate for possible vacuum leaks , carbon buildup or a dirty/bad maf sensor.

otherwise it's just too coincidental that the herky-jerky driving came along only after I reconnected battery.
I did readapt the TB after the battery was disconnected but that didnt seem to help.
Now some have suggested torque converter failing, or atf low--which yes are possible causes.
but i'm thinking first point to start is whole air intake, maf, idle control valve, plugs and coils...
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