10-19-2021, 11:52 PM | #1 |
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Hi all, I've posted in a few threads trying to find some answers but I'm at my wits end and need some help. Below are the steps of what has happened so far
1. Replaced valve cover gasket 2. Replaced oil filter housing gasket 3. Slightly cracked the head of the charge pipe while doing 2, ignored it 4. Tested the car by idling only. Engine shakes a little when first booting it, and then over time the RPMs just keep dropping. At around 500-550, engine misfires and revs up the RPMs to about 1k, and then everything repeats. 5. Found codes P112F and P0171 6. Bought and installed a VRSF charge pipe thinking that could be the problem. 7. Same shaking issue, same codes 8. Did a smoke test and could not find a leak (what point is the best to test the smoke from?) I think that's everything. Does anybody have any idea what it could be? The car drives fine for the most part, but just can't idle. I've found the descriptions for those codes but I just can't pinpoint what the issue is. Please help! Correction: the car does not drive that great. When I come to a stop at all abruptly, the RPMs dip to around 500, car shakes, and revs up to 1k |
10-20-2021, 05:22 AM | #2 |
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Following. Have experienced a similar issue intermittently.
Wonder if your throttle body has some buildup, might be a good idea to check and make sure the plate is able to open and close freely. |
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10-20-2021, 11:18 AM | #4 | |
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Two places I would investigate.
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10-20-2021, 11:50 AM | #5 | |
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Also, when you did the smoke test, did you pressurize? Did you try unplugging the MAF? I thought i just linked the other thread with that procedure recently but let me know if you can't find it. |
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10-20-2021, 11:53 AM | #6 |
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Found the thread with the MAF discussion: https://f30.bimmerpost.com/forums/sh...8#post28101828
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10-20-2021, 12:30 PM | #7 | |||
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10-20-2021, 12:34 PM | #8 | |
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MAF is on the intake yes, right after the airbox. OFHG shouldn't have the potential for a vacuum leak, but VC does. |
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10-20-2021, 01:30 PM | #9 | ||
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I was thinking maybe the OFHG because I had to take the intake off a bit and shift it over. It's how I cracked my CP in the first place. Also would you mind explaining how the VC could produce a vacuum leak? My understanding is it's just oil |
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10-20-2021, 01:42 PM | #10 | |
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FCP discusses how the VC is used: https://blog.fcpeuro.com/bmw-n55-x5-...ymptoms-review "Since the valve cover also acts as the vacuum reservoir, any cracks here will create vacuum leaks. This will lead to rough running and wastegate issues. " If you removed intake manifold, you could have also created a vacuum leak there. A smoke test should be enough to reveal a vacuum leak, but you need to make sure the smoke is getting past the TB. Pressurizing with the smoke also helps. |
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10-20-2021, 02:11 PM | #11 | ||
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I removed the MAF now, but not at a cold start, and the issue was gone! Plugged it back in and it came back immediately. So now from what I saw in the other thread, people remove the MAF on a cold start, let it run, turn it off, then plug it back in? Just ordered a new air filter and will do the MAF stuff after it comes in. How can I reset the adaptations for the MAF? I only found instructions for the transmission |
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10-20-2021, 02:24 PM | #12 | |
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You can reset adaptations with MHD/BM3, but if you don't have either of those, not sure if there are any free apps that can do so. |
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10-20-2021, 02:29 PM | #13 | ||
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10-20-2021, 02:29 PM | #14 | ||
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10-22-2021, 09:10 PM | #15 |
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10-23-2021, 09:04 AM | #16 | |
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The CCV hose gets brittle over time so it's best to just replace it rather than diagnosis it for leaks.
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10-23-2021, 02:53 PM | #17 | ||
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10-23-2021, 04:18 PM | #18 | |||
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10-24-2021, 06:03 PM | #19 | ||||
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10-24-2021, 06:12 PM | #20 | |
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10-24-2021, 11:22 PM | #21 | ||
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10-24-2021, 11:25 PM | #22 |
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