For those with Audi Sports Exhaust...

[Powerenhancer]

Is your engine smooth on initial cold start-up? My old 2014 model with standard exhaust was smooth throughout. However, the 2015 model I just collected with sports exhaust shakes and vibrates for the first 10-20 seconds. It then becomes smooth when the RPMs drop to normal idle speed?

Cheers

[MikeFish]

Can't say I've noticed any shakes and vibrations when starting cold other than normal ones. Mine is a 2016.

Assuming there is something wrong and you are not being paranoid, then check secondary air injection. Have you done a scan?

[zebede]

Nope it's as smooth as a freshly waxed lady part

[Powerenhancer]

Thanks, will get the vdcs on it Monday. Failing that, back to the dealer.

[zebede]

Sorry I wasn't more descriptive but I may have been blocked

[wildbore]

Is your engine smooth on initial cold start-up? My old 2014 model with standard exhaust was smooth throughout. However, the 2015 model I just collected with sports exhaust shakes and vibrates for the first 10-20 seconds. It then becomes smooth when the RPMs drop to normal idle speed?

Cheers

This sounds normal to me. On startup the exhaust flaps are open so there is quite a bark and a rumble, and idling is poor and slightly lumpy before settling down to a whisper-quiet tickover after about 10-20 seconds. Occasionally, this startup rumble sets my engine into a very rough idle that can shake the car slightly. I clear it with a small dab of throttle.

Done that on every startup since new (now on 19000 miles).

[Gazsouthgate]

Im very familiar with what you at describing. Bit grumbly on start up but then as soon as I put into gear the revs chill out. If left in P it calms down after 20 seconds or so as you say. Totally normal in my view.

[Powerenhancer]

Yes, grumbly is a good description. Feels like misfires and the car wobbles a little until the revs fall to normal. My 2014 with standard exhaust was silky smooth during cold start-up as a comparison.

Full Vagcom check today and couldn't find any errors.

[Gazsouthgate]

Yeah, interesting - I had a misfire on my Boxster back in the day a couple of times and I thought EXACTLY the same thing first time i had a cold start up on the audi, but figured there are so many systems that any probs would be alerted to me on the dash, and since then I haven't really worried about it. I call it character! And sounds like Vagcom agree!

[MikeFish]

As described above, mine is noisier when first started until about 20 seconds or it is put into gear. But no vibrations or wobbles, just lovely deep V8 burble.

[Bit_evl]

+1 on startup it likes to grumble a bit for a minute.
Prod the accelerator clears it quicker if you need to.

Slight feeling of imbalance
Louder
slightly higher revs

[MikeFish]

I paid more attention to mine this morning and while in the cold start phase it may have been vibrating a bit more than I thought. Only slight though.

[Powerenhancer]

Sounds like it could be normal. I feel it through the drivers seat the most.

Apologies if I have switched on anyones OCD's!