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OK - so this is the first chance in weeks (literally) that the weather's been good enough to open up the throttle. The car was very lumpy while warming up and it just felt like it needed a blast to clear it's throat.

So... after warming up, I took it up to 7000/7500rpm (not to the limit) and all was fine unitl I looked in the mirror and saw sparks coming out of the back. I pulled in and looked all round and under the back, but could see nothing amiss.

Got back on the road and played around a bit but couldn't get the issue to repeat. Performance was absolutely fine and not lumpy like it had been. Have driven another 20 miles since and all seems fine.

Could this be a build up of carbon in the system after driving so slowly for so long in the wintery conditions? All that warming up on the driveway probably wasn't great either, but there was no alternative at the time.

I'm hoping this is just a one off, but I guess I'll find out pretty soon if it isn't. AA membership and Recovery all in place.

Anyone else seen this before?

Either that or its the remanence of a mouse that's made a nest in your exhaust system lol

Noticed similar when watching rs4s on the dyno,these cars need caning on a regular basis

lengster1 wrote:Noticed similar when watching rs4s on the dyno,these cars need caning on a regular basis

Thanks lengster - does it clear up quickly on the dyno? It didn't last long and I figured melting aluminium would have a more noticeable (and permanent) effect.

Yep this happened to mine on the dyno if you see you tube any RS4's on the dyno do this so nothing to worry about at lengster say the need a good thrash to clear out the cobwebs

That is you fixing your carbon build up issues for free.

Thanks all - I feel more reassured that something expensive isn't about to happen. Brooner - you don't have a lilac B5 often seen on the South Deeside Road in the mornings do you?. If so, I'm the blue Avant in the left lane.

Cheers again

yeah this happened to me too, backing off in 6th at high speed at night, looked like sparks scattering over the road scared the sh*t out of me!

Brooner - you don't have a lilac B5

no i have a sprint Blue B7 Avant never seen th lilac one around