Hi Guys,
Love the site and it’s resources.
I just bought an 07 S6, 130k miles - it came at the right price so I thought “what the hell!” I knew it’d got a few issues just from my inspection and test drive.
A small intermittent misfire higher in the revs, no doubt plugs, coils and/or injectors. I’ll get around to carbon-cleaning in due course.
My first issue is to get it running - it churned a little before starting which I put down to an incorrect battery and it being sat. However, once I got it home and looked a little further I discover the battery negative cable an especially the bolt attaching it to the battery control unit is really hot - sufficient that it’d charred the trunk cover directly above! Looking closely, I could see arc marks on the cable BCU bolt. My guess is that ignorant to the Ways of Audi, the seller had jumped or charged the flat battery directly off the battery terminals, probably frying the BCU in the process?
I got my shiny new VAG-COM, hooked it up but not altogether sure what I should be looking for to confirm anything.
I’m guessing I need a new OEM spec battery, BCU and recode appropriately and then hopefully discover the rest of the joys awaiting me…
Any help or suggestions MUCH appreciated.