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I didn't. My brother had one laying around and said: change it and see what happens. I had my doubts anyway. I would have never guessed that the vibration is due to ECU...

So it's been 4 days since I have changed the ECU. So far the problem did not reappear and the vibration at idle is significantly dimmed.

I have put new spark plugs and other know good coils. Still have old coils though, but no difference. If it would be the MAF, why would only give bad info to ecu when cold? And it's not like it has time to heat up or something, cause in a matter of a minute or so the engine is back to normal.

So today it did it again. So it's not the SAI. Started the engine for aprox 1 min, then put it in gear and wanted to move. The engine stared to shake and turned it off. Switched it on again and then it worked fine.

Seconday air pump? The one that's pushing air into the exhaust? Hmm, I will try to unplug it, but it could be the secondary air valve(the one way valve) faulty. Thanks for the tip. Will check and let you know! @Asim1, high unlikely. If there were problems with injectors not being seated...

There is only 1 one-way valve between the manifold and servo. Check if it holds vacuum: shut off engine without applying brake, wait 10-20 minutes then remove the hose that goes to the servo. If you hear air rushing in, it's okay. If there is atmospheric pressure, then the valve is broken.

So the problem is now back. As the temperature is now close to 0 degrees, the engine barely starts in the morning. So, you turn the key, it fires up but it seems to be firing on 2 or 3 cylinders and it shakes a lot, or even stalls. Second or third start up and everything is back to normal. OR...

I find confusing counting the teeth, but in this picture it is clearly out of sync.The exhaust cam is one tooth jumped. You can take out the intake cam out(including the hall sensor), jump a tooth on the exhaust cam, then reinstall. This was, you don't need to touch the timing belt.

So I have replaced the DMF with SMF and there is an improvement, but not as I imagined. Still vibrating, still annoying... During the job I checked the engine and gearbox mounts and seems fine to me. So, what to check next?

I have no such thing on the air filter housing. But I have found the problem. It seems to be the DMF fail. With one wheel off the ground and in gear, this is the play in the flywheel:

No, it's not a misfire vibration. Also, that would throw an error code, but it doesn't. Do you have a picture of the said part? I don't know what are you referring to. @daniel, not sure. They seem fine to me, even the dogbone.

Hello again everyone, So my girl has an Audi A3 1.8t AUM and at idle there is a strong vibration inside the car, that seems to come from... everywhere. As soon as you pass 1000rpm, the vibrating is gone. I have also tried to raise the idle but it doesn't pass that point where everything is...

After 2 weeks of no more the issue, I can say I have solved it by replacing the fuel pump inside the tank.

But the right right-most indicator is the seat belt indicator... http://www.diagnostic-world.com/_familyCustom/0/areas/2102414719/publish/thumbnails/rev_18//main/1334009.1109.jpg Where does that wiring go? Directly to instrument cluster?

Hello all, Just bought my girlfriend a 2002 Audi A3 1.8t and it doesn't have the seat belt warning. Where should I start to install it?

Wait a minute! Does the 1.8T have dual mass flywheel?

Soulnd't an ignition coil throw a knock fault code? Just discovered another symptom: the engine fires up, but has absolutely no power. If you try to move the car, it just dies, restart the engine and everything is fine...

Yes, I did scan with vagcom and there are no fault codes.

Hello all, My girlfriend has bought an 2002 audi a3 1.8t aum engine and has a random start up problem. The problem is very rare, maybe just twice per month, but when it happens, when she starts the engine, it stutters very violently, like it-s about to blow up. Sometimes the engine dies and...

I am a car mechanic and I fix VAG cars, but making a custom wiring loom is something I will never try. Mostly because anything with more than 6 wires, is too complicated for me.