[Prefferle]

Originally Posted by Prefferle

Update; ok so I’ve disconnected battery and disconnected connectors to both ECU’s, all looked clean inside no signs of corrosion or water ingress. I sprayed these with Deoxit and reconnected.
Disconnected and checked all electrical harness connectors along with cleaning up all earth connections (coilpack earth on cyl heads and inside wheel-arches) that I could access.

Reconnected battery.
Start-up ok engine idles smooth with 0 misfire counts across all cylinders.
Test drive with VCDS still connected. No misfires detected.

So far so good. I’ll do a cold start and longer drive for the readiness tests to be completed.

Thanks again guys, I’ll keep updating.

UPDATE
To close out this issue i sorted this issue a while back - sorry for the late post - the ‘new’ Oil Separator that I fitted previously was defective! On recommendation from a USA Audi Forums chap I purchased another new oil separator (Febi) and no more misfire! Lesson on low cost aftermarket parts learned...