S4 misfire when starting from cold

[yorkie]

Got this today on a mate's B6 platform S4 Cabriolet.

16684 - Random/Multiple Cylinder Misfire Detected
p0300 - 008 - Implausibe Signal - Intermittent

16685 - Cylinder 1: Misfire Detected
p0301 - 008 - Implausible Signal - Intermittent

16689 - Cylinder 5: Misfire Detected
p0305 - 008 - Implausible Signal - Intermittent

16687 - Cylinder 3: Misfire Detected
p0303 - 008 - Implausible Signal - Intermittent

16691 - Cylinder 7: Misfire Detected
p0307 - 008 - Implausible Signal - Intermittent

16686 - Cylinder 2: Misfire Detected
p0302 - 008 - Implausible Signal - Intermittent

Only happens when starting from cold.

Have looked at Ross Tech Wicki and there are too many possibilities.

Hoping someone has experienced the same.

Any help appreciated.

Cheers

[grizz]

Try running with the maff disconnected ..

[yorkie]

Thanks for the tip mate but I logged the MAF and it was flowing peak of 268 which by using the .8 calculation equates to 335 bhp which considering the temperature I thought looked ok. I am more suspicious of a temp sensor as this only happens around 10 seconds after starting from cold. Have done readiness tests and output tests without finding any problems. I must admit if a sensor was faulty I would have expected a "implausible signal" or "short to ground message" which I haven't got. That then leads me to suspect a mechanical problem such as spark plugs or injectors. Any more suggestions appreciated. Cheers.

[baylissboy]

Does it make any odd rattling noises from cold, i had an similar issue, turned out to be the chain tensioners.

[yorkie]

Cheers for the reply, I'll have another listen as I don't think he has had it sorted yet.