Golf 77TSI oil in throttle

[Ian C]

Hi to anyone who can help
My 2010 Golf 77tsi has started running rough while idling but only during a cold start. I read some info about cleaning the sensor on the air intake so I undid the plastic air intake chamber at the turbo end and lifted it off the throttle opening. To my surprise oil dripped out while removing the component. After a good inspection, I noticed there were drops of oil at the throttle opening. It's coming from inside the turbo as the oil was seen inside the turbo's outlet pipe.
I wiped the oil from the intake and*throttle. I used MAF cleaner on the sensor and put it back together. I waited until next morning and the car started good with an even idling. Now after a short drive, the oil must be back as the last cold start was rough and again idling too low. The oil seepage has been happening for a while now as I had noticed oil around the throttle body previously. It's been making it's way down the back of the engine and onto the CV joint. During the last service, I asked the VW tech if he could look at the oil on the drive shaft as I thought it was the axle/gearbox seal. The tech said it wasn't a seal and all is ok. I now know where the oil is coming from.
I am hesitant in taking to VW service as I've spent a lot of money lately on various issues and seem to have more problems after each VW repair. Below are the recent jobs by various VW service centres.
Shudder in second gear* - The DSG clutch packs replaced twice.
Loss of power while driving on freeway - Spark plugs leads changed, ECU updated*and throttle cleaned.
Noisy timing chain during cold start - Timing chain, tensioner and cover replacement (plus it went back again to have the timing chain cover replaced due to an oil seal leak.
I bought*the car*new, drive it carefully, done only 80,000 klm and have always looked after it. I'm getting a bit peeved with the issues now and was wondering what others have to say. Is it an easy fix this time around or something major?
Any input would be really appreciated.
Ian

[Ian C]

Regarding oil in the intake chamber and throttle, I took the intake off again to check if it had oiled up but it seems to be ok - nothing like before. A film of oil around the internal plastic intake, nothing in the throttle opening.
After reading many posts about rough idling especially after cleaning the MAP sensor, I found that an ECU reset was needed as the throttle required recalibration or alignment. There was only old posts that I could find on how to reset the ECU and this was on various makes of vehicles. There was nothing that I could find on a 2010 77TSI Golf.
I took the chance and tried this easy reset method recommended by many mechanics. This required me to disconnect the neg terminal on the battery. I then left the car for 2 hours with the door slightly ajar so the interior light drains any remaining power. After that, reconnect the battery, turn the ignition on only for 10 - 15 seconds then off. Now start car but don't touch accelerator and let it idle for 10 mins. That's all there is to it, I then took for an hours drive and now the rough idle problem is fixed.
I'll keep my eye on the oil in the intake chamber and around the throttle and report at a later time. Hope this assists any 77TSI owners.

[Ian C]

Well after all my experimental work on the idling issue, it didn't work.
The last 2 cold mornings I started the car and it was back to it's old ways. Running rough and idling too slow.
The car is still driving and idling perfectly once it's warmed up. Today I thought I'd check the oil issue to see if it's still building up in the air intake. When I got home after a long drive, I pulled off the air intake again and oil dripped from the plastic chamber again and into the throttle body.
The oil must be causing an issue with the idle control valve or some other component which is affecting the cold start. Not sure what to do now?