Audi FSI HELP PLEASE

[Llc1790]

Hi all i have a nice Audi 2004 2.0 fsi sport its good to look at nice to drive however there is a BUT
When it is cold say in the morring if will start fine then as soon as the cold start comes off it runs lumpy very lumpy
all most to the point of stalling as soon as it gets hot it then runs fine
Any help or questions fill free to ask
I would love to get to the bottom of this .
Thanks for looking.

[barryrs]

It could be a build up of carbon deposits on the inlet valves or manifold flaps; a very common problem on direct injection cars and being a 2004 seems like a potential problem.



Course is could be a whole host of other issues so probably best to see if any fault codes have been thrown up.

[carreauchompeur]

Temp sensor/MAF/idle control valve I would expect. Have you read the fault codes?

[Llc1790]

It dose not come up with any fault colds helpful i know lol
Its been compression tested & that was all good.
it had new spark plugs, air mass flow sensor, ignition calls, & a new timing belt.
And of course new air, oil and fuel filter.

[SmithyAG]

Have you scanned it with a generic reader or with VCDS?

Quite often codes which do not throw an engine management light, will not show up on a generic reader but will on VW/Audi specific scanners (e.g VCDS).

[Llc1790]

Well i took it to vw specialists (as my mate works there ) & they did not find any thing.

[SmithyAG]

Llc1790 said:

Well i took it to vw specialists (as my mate works there ) & they did not find any thing.

I'd assume they have used specific diagnostic software then. Was just a thought! :-)

[Llc1790]

Yes as its a vw specialists garage they have all the correct diagnostic software.

[oldaudi]

MAF Sensor would be worth cleaning

[Llc1790]

Thats one of the new parts its had fitted

[ManOpener]

Intake tumble flaps tend to cause cold start roughness. As does low oil and PCV but that's TFSI specific I think.
Tumble flaps won't always trigger an error message. Coking tends to be less of an issue in the UK than it does in other markets as long as you've kept to the manufacturer specifications with regard to oil- though it will exhibit itself if you do lots of cold start driving without letting the engine fully warm. It will also result in roughness throughout the range rather than just at low RPM and when cold.

Tumble flaps are a cheap fix, engine coking is not. That's a head off, soak in solvent, reassemble, many-hours-of-labour job.

[Llc1790]

ManOpener said:

Intake tumble flaps tend to cause cold start roughness. As does low oil and PCV but that's TFSI specific I think.
Tumble flaps won't always trigger an error message. Coking tends to be less of an issue in the UK than it does in other markets as long as you've kept to the manufacturer specifications with regard to oil- though it will exhibit itself if you do lots of cold start driving without letting the engine fully warm. It will also result in roughness throughout the range rather than just at low RPM and when cold.

Tumble flaps are a cheap fix, engine coking is not. That's a head off, soak in solvent, reassemble, many-hours-of-labour job.

Thanks for that i will have a look into the Tumble flaps.