08-30-2022, 07:34 AM | #23 |
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Ive done DIY work on several dozen Diesels (friends and my own) from VW's, Fords, BMW's and literally see this residue in all of them. A little oil does tend to get into the charge pipes and every intercooler i've replaced also has a few spoonfuls pooled in.
This is essentially a very minor boost leak letting out slight oil vapour. I wouldn't lose any sleep over it, but your best chance at fixing would be to clean the seals between pipes and re-fit. I very much doubt your CCV/PCV is an issue. |
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08-31-2022, 06:43 PM | #24 |
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CCV pressure measured? Am I doing this right?
I found the BMW SIB to diagnose crankcase pressure. It seemed like all they do is connect a manometer to the oil filler cap and measure the pressure at idle. I made my own out of a spare cap and a manometer from Amazon. When I drilled the hole in the cap, I made sure pressure was getting through to the other side of the cap and it wasnt a dead end.
Connected the high-pressure hose to the cap adapter, left the low pressure side open and exposed to ambient pressure. Zeroed the manometer, ran a 3-minute measurement with the engine at idle. It averaged out to -1.6 mBar. Going by the SIB it's in spec, but did I do this right? EDIT: Above was with a cold engine. After running the engine up to temp, the average over 3 minutes as -0.6 mBar.
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2017 328d xDrive Sports Wagon: Estoril Blue, Black Sensatec, M-Sport Pkg
2020 i3 Rex: Capparis White, Giga World Last edited by capt_slow; 09-01-2022 at 10:58 PM.. Reason: More info |
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09-16-2022, 01:32 AM | #26 | |
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12-29-2023, 08:59 PM | #28 | |
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Can anyone have a peek at their intake and see you have the same spots as mine? A more recent pic looking up from the bottom of the car.
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12-30-2023, 08:43 PM | #29 |
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I will look at mine tomorrow. My car is white and I noticed what I thought was excessive black dirt in weird places under the hood. It had 20,000 miles on it when I bought it and I just thought that it was a lease and nobody ever cleaned under the hood. Maybe some of that was from blow by? I have since done an engine cleaning and have not seen any of that black return on the white painted areas. Will check tomorrow.
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