B7 S4 rattle

[Hydracam]

I think this may be another one for the Tame Tech. I have had my B7 S4 Avant now for nearly 2 months and when I start the car it has an after grumble/rattle from underneath the car. Not sure if it sounds like a rattley exhaust, starter motor running on slightly or the bottom end as if the bearings where worn out. The engine runs as sweet as a nut and it doesn't appear to be using any oil yet dispite the compulsary trips to the red line... Any suggestions welcome as the next option is to take it to Audi and it doesn't happen all the time so could be expensive...

[TonyHetherington]

Is it literally thefirst 5 seconds you start the car? Are you sure it's not the timing chain? They all (my B6 shape included) make that slight rattle after the engine has started, sometimes quite loud, but it's quite ok.

[Dr G]

Yup, 'they all do that sir'.

Strange noise but nothing to worry about. If you drop it in to your dealer I'm sure they'd be happy to confirm for you.

[Hydracam]

Cheers guys,

the noise does vary a bit from loud enough to notice to not noticable at all. Is the chain tensioner hydraulic..? and the rattle caused by the chain before it's correctly tensioned.?

Thanks for the replies I'm already feeling better.


Paul

[Tame Technician]

upto 2 seconds of ratle after start up wouldnt worry me. Much more than that and I might me concerned. its just the timing chain rattling as the tensioner has no oil pressure yet.