Scratching my head on this one.

Recently replaced the turbos feed and return oil lines. To fix a common oil leak. Also replaced the the oil filter housing gaskets while I was in there. After putting everything back together. Toped off the oil, and filled and bleed the coolant system. Now I have a rough idle issue. seems that there might be a vacuum leak? When pulling the oil cap off while the car is running. There is some suction that pull the cap back on.

Before going to pull the heat shields back out and the down pipe. Looking to see if anyone might have some thoughts.

2011 Countryman S

 

Quick update:

I bled the coolant system again. Just to double check that off the list.

Still idles rough. However it did run smooth for a short moment when the engine first started, and gradually got worse as more coolant fluid entered the engine.

 

That the oil fill cap is just slightly pulled down onto the valve cover by vacuum is a good thing. But I don't suppose it means you couldn't have a leak somewhere. Running rougher as more coolant enters the engine is odd, probably coincidence, as the engine is getting warmer also?

Getting any error codes? Triple check every electrical connector got plugged back in?

 

Finally had time to go back in. All hoses look to be in good condition. Double checked wire connectors. There are 2 on the oil filter housing. I believe 1 is the aux water pump and the 2nd is a air temp sensor. Seems they are correct. As the wire harness does not allow them to stretch out past where they can reach. Going to start buttoning it back up and see if there is any change.

Unfortunately, I cant check for codes at the moment.

 

What was the end result?