Rough Idle... MAF sensor?

[Nimosonen]

Hey Guys!

My A3 02 mod are uneven on Idle when the engine is cold. It´s been like that for a while, but it is starting to be uneven on idle when its warm to. I think it´s the MAF sensor tho, but do you guys have any other suggestions?

 

[<tuffty/>]

Air leaks generally... MAF doesn't normally cause this issue... the fact you mention the issue has got worse suggests its an air leak to me tbh...

Have you scanned for any fault codes? ideally you should check fuel trims too as excessively high numbers would point to an air leak...

<tuffty/>

 

[epox]

Unplug it and see if it still happens?

Spark plugs...coil packs?

go with tufftys first

Mark

 

[Nimosonen]

For a while ago me and my friend took an VAG scan on it, but no fault codes on the air system.

Would be nice to get this fixed, but would be nice to know what to change and do..

 

[<tuffty/>]

So there were faults? air leaks don't throw specific fault codes... any fault codes could be the result of an air leak like adaption codes etc... just because a fault doesn't say air leak explicitly doesn't mean its not related or a result of another issue

Smoke test will show you leaking pipes etc... most are under the inlet manifold or SAI... if you can't get it smoke tested then you will just have to look at all the rubber pipes checking for splits... oil sprayed everywhere is the normal clue...oil should be inside the engine... if its outside the engine than its either leaked out or been blown out.. older engines should be dirty not oily...

<tuffty/>

 

[Nimosonen]

There were more electrical fault codes then engine and performance fault codes.

It´s kind of greasy near the oil cap, and there are many air lines going past it. Maybe I can check there and look for leaks..

 

[<tuffty/>]

Can you rescan and post results? as you are having running issues then they could well be relevant..

<tuffty/>

 

[Nimosonen]

Sure Have to wait a few days, since it´s my friend who has the scanning tools, but I´ll update you afterwards

 

[Nimosonen]

Hello again. These are the fault codes I got on the scan:

Address 03: ABS Brakes Labels: None
Controller: 1C0 907 379 G
Component: ESP FRONT MK60 0101
Coding: 0011266
Shop #: WSC 06435
VCID: 2E2F3805F90F
1 Fault Found:
00285 - ABS Wheel Speed Sensor; Front Right (G45)
012 - Electrical Fault in Circuit - Intermittent



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Address 15: Airbags Labels: 8L0-959-655-AI8.LBL
Controller: 8L0 959 655 L
Component: Airbag Front+Seite 7008
Coding: 00104
Shop #: WSC 06435
VCID: 47E16DA176B5
1 Fault Found:
01212 - Belt Tensioner Igniter; Rear Passenger Side (N197)
32-10 - Resistance too High - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8L0-920-xxx-17.LBL
Controller: 8L0 920 900 N
Component: KOMBI+WEGFAHRS. M73 D03
Coding: 08142
Shop #: WSC 00000
VCID: 361F1065015F
WAUZZZ8L22A076331 AUZ5Z0B2285068
1 Fault Found:
01336 - Data Bus for Comfort System
37-10 - Faulty - Intermittent

-------------------------------------------------------------------------------
Address 35: Centr. Locks Labels: 8D0-862-257.LBL
Controller: 8D0 862 257
Component: ZV-Pumpe, DWA, Funk D16
Coding: 15179
Shop #: WSC 06435
VCID: EAA774158567
1 Fault Found:
01374 - Alarm triggered by Terminal 15
35-00 - -