My S8 has been dropped off to SW AUTOS for manifold clean up

[aceparts]

As it's done 125k miles I'm expecting it to be pretty blocked up. I'll keep you posted!

[aceparts]

Well, I'm currently broken down in a services after collecting the car.....

First I had Engine management light on, then flashing then running on five or less cylinders and the EPC light on. I took it back, they plugged it in and it was fine for a couple of miles before playing up again, only now they're closed!


Limped the car to my friends to find a loose earth cable on manifold, now it runs for 10 minutes before repeating the sequence.

Turning the engine off resets the sequence

[benjijames28]

Hopefully they just cocked up putting the car back together and havnt damaged anything!

I'm guessing it went in for a carbon clean?

I've been considering getting same done on my a3.

[aceparts]

Update - I disconnected the battery for five minutes and now the problems and lights have gone. Car really flies!

I'm halfway home (150 miles) so I'm committed now!

[dvs_dave]

Audiworld is the "go to" resource for A8/S8 troubleshooting. Saved me thousands over the years. Someone is bound to have had and fixed this issue before.

http://www.audiworld.com/forums/a8-s8-d3-platform-...

[aceparts]

It's fine now. The earth for the left bank of coil packs was loose. After a period of misfires the ecu shuts down fuel to the entire bank.

[aceparts]

It's still giving the occasional engine management light. Shame as it was perfect before they touched it. Seemed to do a great job and then left a very important wire loose on the top of the engine!

[barryrs]

Just a thought, my S6 started throwing occasional fault codes with no apparent symptoms and it turned out to be a failing battery. Seeing as your car has been in for some work could an extended period of the ignition being left on or the bad earth have effected battery performance?