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28A0 Code Diagnostic... Wastegate Reservoir
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07-15-2021, 10:40 PM | #1 |
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28A0 Code Diagnostic... Wastegate Reservoir
I'm working on diagnosing my cousin's X5 35i 28A0 code, and I read in this BMW TIS article that I can apply vacuum to the wastegate actuator vacuum reservoir to test for leak down. When I do this, it seems to leak down fairly quickly. I pumped it up to about 5-6 in-hg, then it took probably 3-5 seconds to leak back down to zero.
When I did this, I had just smoke tested the intake tract for vacuum leaks, so it was still holding smoke at this point. Before connecting the hose from my vacuum hand pump, there was NO smoke coming from the vacuum port. When I pumped, it was pulling smoke through there. I'm assuming this is a diaphragm, and it's to be expected? Or is there a small crack that it's pulling from, which would be causing the fast leak down? According to the owner (who has had it for about 3-4 weeks now) the previous owner changed the valve cover in October of last year. It's an aftermarket one so I know it's likely to be the culprit here. Otherwise, I can't find any other issues. No other vacuum leaks, and the PCV/CCV did NOT suck in any smoke when I tested that. Can anybody confirm the behavior of these wastegate reservoirs?
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07-16-2021, 09:58 AM | #3 |
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Ah, that's what I didn't do. I'll check it again later with the other port plugged.
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07-17-2021, 12:14 AM | #4 |
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I plugged off the other port earlier and tested it, and while it leaked down slower, but it still leaked down. I also noticed it was pulling oil through when I pumped the vacuum pump. I have a feeling this isn’t exactly how it was designed... am I wrong?
Interestingly enough, the car isn’t down on power from what I can feel. It’s super sluggish to get going from a stop, but from what I can tell that’s normal and software-related. My E90 was similar.
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07-19-2021, 10:25 AM | #6 |
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Sounds like you need a new valve cover. Oil is getting sucked up into the built in/integral vacuum galleys of the cover.
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07-19-2021, 10:41 AM | #7 |
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That's what I was thinking. So I'd be correct in thinking that these vacuum chambers are supposed to be separate from the inside of the valve cover? They're closed off and should NOT have contact with oil?
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07-19-2021, 11:38 AM | #8 |
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That's correct, there shouldn't be any oil in the vacuum chamber on the valve cover. In addition to sucking oil in through that crack, that is also going to be a source of the vacuum leak. So unless there are additional leaks somewhere else, I think you found the cause of your vacuum leak
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07-19-2021, 12:41 PM | #9 |
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Yes the chambers should be separate because the introduction of oil would mean that the boost solenoid won't be able to reach and pull the specific vacuum wanted which will affect how much the wastegate will close.
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07-19-2021, 12:50 PM | #10 |
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Okay, that confirms my suspicions! Thanks guys!
I'll let him know he needs a valve cover. That would be the leak, since I can't find any other leaks.
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07-19-2021, 05:12 PM | #11 |
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07-20-2021, 12:21 AM | #12 |
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I’ll add that to the list!
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06-22-2023, 08:42 PM | #13 |
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I have a question I have the same issue and I was reading your post about the oil coming out from those nipples from the wastegate reseivor , is this normal ? Or we shouldn’t have oil in it pictures here
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06-23-2023, 09:42 AM | #15 | |
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Quote:
To upload pictures, scroll down on the posting page and select "manage attachments".
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