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Hi,
I was doing the 2 tests on M52 engine, balloon test on dipstick tube and bag over oil filler hole.
1. on dipstick the balloon got only slightly sucked, very light vacuum.
2. on oil filler hole the same, very light suction.
Both indicate properly working CCV? But theres one thing I noticed that I never would expect, when I removed the oil filler cap idle went up and car actually sounded really strong.
I have to say the car does feel kinda lazy, it idles smooth, but Im told bit low (~500rpm). Does this indicate not a bad ccv but more like bad MAF or vacuum leak?
I'm asking because on another e39 we had the idle went really rough when removing the oil filler cap.
 
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