Engine Rough at 2300rpm, Normal?

[graybags]

Although I am new to RS6 ownership, I'm not convinced that my engine is running correctly.

Although it is quite smooth when driving gently, it gets rough as the revs/load increase. When overtaking, the exhaust note gets much louder without a huge increase in acceleration. The push-in-the-back is quite gentle.

One specific symptom is as follows: In neutral, gradually increase the revs until around 2300. Here the engine starts to run roughly (misfire?) and the balance goes so that the whole car vibrates (like running on 7 cyl). Do other people's engine do the same? I'm told that this is normal.

It's a standard engine and there are no error codes.
It has just had the full 40K service, including plugs, which has made no difference.

Please tell me this isn't normal. My Wife's 2.0TT is as quick.

Many thanks, Graham

[andyt]

Please tell me this isn't normal. My Wife's 2.0TT is as quick.

That's *definitely* not normal!

[CliveH]

None of that sounds normal to me Graham.

Take it to a specialist - oh, I see you're in Oxfordshire - just pop down the road to MRC. Doug will tell you exactly what's wrong with it

[graybags]

Thank you both for the reassurance.

I was pretty sure it was wrong. I will go to MRC.

Cheers, Graham

[skiwi]

are you sure there are no codes? it sounds like you have a misfire and the usual suspects for these events are plug wires, output coils or maf.

definitely take it to a good dealer and demand that they fix it. what you describe is not normal.

[graybags]

It does feel exactly like a misfire – worse under load and higher revs.
Frustratingly, there are definitely no codes though.

I demonstrated the effect to a dealer today and was assured that it was normal.

Any recommendations of a dealer that really knows what a '6 should be like?

Gray

[skiwi]

1) not all misfires will throw codes.

2) change dealers.

3) for your own peace of mind, i suggest that you find another rs6 owner in your area (and they are some probably on this list) and compare vehicles.

[Gavc500]

PM'd you

[CliveH]

What skiwi said

On #2, I assume you haven't got to see MRC yet?

[graybags]

Spoke to Doug this morning. Car's booked in this Thursday. As he quite rightly said, a dealer will just continue to change parts until they hit on the right bit – which could take ages.

Un-surprisingly, the rough running is much more noticeable now that I have finally got the DRC system sorted. Wow! What an improvement that makes.

Really anxious to get the engine fixed now. I've owned the car nearly two months already.

Thanks again everyone for the assistance.
Graham

[MarkB]

Keep us all updated. It's good to hear what the result was... Thanks

[graybags]

Well now I really am confused.

According to a thorough health check (thanks to Doug), there is no evidence whatsoever of any misfiring from the engine. Fuel, lambda, airflow, timing, exhaust temp, etc., all normal.

But. . . there is a definitely a vibration coming from somewhere as the revs rise – particularly felt at around 2K. It is noticeable when driving and when in neutral it actually shakes the whole car.

Is this, perhaps, just normal for the V8?

It does seem to pick-up better now all the plugs are tighter though.

Concerned of Oxford.

[Rupert]

I'm no expert, but would worn engine mounts have anything to do with this?

http://rs246.com/index.php?name=PNphpBB ... nts#156439

They use hydraulic mounts as opposed to rubber bushes to reduce engine vibration coming into the cabin.

[Rupert]

Please tell me this isn't normal. My Wife's 2.0TT is as quick.

That's *definitely* not normal!

Sorry, I read the rest.
Nope, that's definitely not normal. Mine still makes me say "wow" from time to time and that wouldn't happen if it wasn't stupidly fast.

[skiwi]

my guess would be engine mounts. they are electronically controlled using a fluid damper system. this is supposed to go from soft (@idle) to hard @higer revs. worth a check. good luck getting to them.