Hi All

I have a mk3 Tsi ea888 i have now noticed that the idle is vert rough. I have not yet changed anything was hoping for some guidance here where to start. I'm due a service in 800 miles so the spark plugs will be changed (I do the spark plugs on every service roughly 6-10 months) including the oil and filter. Im currently at 62,000 miles should I think about changing the coil packs as well?

1: I have noticed some oil coming off the PCV at the back of the engine not sure there should be if any there at all?

2: I have noticed some oil on the crank shaft position sensors at the bottom of the sensor. Should this be the case?

3: Engine seems noisier like a diesel also when idle. Driving normally is ok.

I tried uploading an image and video bit for some reason I am unable to.

Where should I start first?

If you have oil coming from the back of the engine, my first go-to check would be the Turbo or the PCV valve failing.

We really need a scan done on the car - either from a ODBEleven scanner (you should always keep one handy if you own a VAG product) or (genuine) VCDS.

Post it the output in here and we can advise further.

On 26/06/2025 at 20:41, Madmax889 said:

1: I have noticed some oil coming off the PCV at the back of the engine not sure there should be if any there at all?

2: I have noticed some oil on the crank shaft position sensors at the bottom of the sensor. Should this be the case?

1. Do you mean outside the valve, on the engine or piping? That ofc is not normal. Oil inside the piping after the pcv is normal.

2. Where exactly? outside the sensor? If you unplug the connector, is there oil in the connector?

On 30/06/2025 at 09:20, varaderoguy said:

If you have oil coming from the back of the engine, my first go-to check would be the Turbo or the PCV valve failing.

We really need a scan done on the car - either from a ODBEleven scanner (you should always keep one handy if you own a VAG product) or (genuine) VCDS.

Post it the output in here and we can advise further.

I have OBD Eleven (have done for years) no faults repeating to the engine at all. I will do a scan tomorrow and add the results. (if I can) Its not the back of the engine I just meant to the back of the engine on the hose coming from the PCV valve at the back of the PCV valve.

On 30/06/2025 at 10:47, Skodaudi said:

1. Do you mean outside the valve, on the engine or piping? That ofc is not normal. Oil inside the piping after the pcv is normal.

2. Where exactly? outside the sensor? If you unplug the connector, is there oil in the connector?

1: Its not the back of the engine I just meant to the back of the engine on the hose coming from the PCV valve at the back of the PCV valve.

2: At the bottom of the sensors themselves. It never really goes to the top just a the bottom of the sensors. I have changed the seals but it still happens. Should I just bite the bullet and replace them as well?