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2010 2011 BMW 5 Series Forum F10 Help! For all you N63/car gurus! |
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02-18-2017, 03:06 AM | #1 |
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Help! For all you N63/car gurus!
Ive been trying to chase down a lean condition on Bank 2 (code P0174)
Dealer has done fuel pressure test, smoke test, and short test. Car is completely stock, and I'm getting +28% Long Term Fuel Trim under load. At idle, both banks even out at about 15.6%. As soon as I press on the throttle, bank 2 shoots above 22%. I'm putting money on the fuel injectors but I have no way to prove this theory. |
02-22-2017, 05:59 PM | #3 |
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If you have access to readouts I would check what each side MAF is reading. If both banks are reading very differently you could have a MAF issue or a vacuum leak that they are missing.
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02-22-2017, 09:30 PM | #4 | |
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I put my car back to stock to try and chase this down. Dealer originally said the N63intakes may be causing it. But the issue is still present. I've swapped MAF's today and the lean code still stays on bank 2. Its possible the dealer forgot to reset adaptations after replacing an o2 sensor and one of my upper intake ducts. Plus I removed my catless DP's right before taking it in. So I'm going to reset adaptations with ISTA with my N63 intakes installed to reset my baseline. Hopefully that works. If not, the only thing left is the fuel delivery on bank 2 or a possible exhaust leak. Unless I'm forgetting something? Crazy thing is, the car runs perfect. It's just the CEL after 10-30 miles after a reset. |
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02-27-2017, 10:38 PM | #5 |
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Drives: 19' M2C
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crazy I get the same code with intakes, catted DPs, JB4, and Cat back M5 CP exhaust. but only after I give it a good run on the highway, then I reset it and I don't see it again. always bank 2. I have a N63TU, had a N63 with only intakes and got a hard bank 2 lean fault. dealer said it was a cold air intake fault but I called bs on that. is it a hard fault or a intermittent one?
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02-27-2017, 10:46 PM | #6 | |
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I'm waiting to put my N63 intakes back on. But when I did have the fault, it would come on every 10 miles and my fuel trims were out of whack. |
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02-27-2017, 11:19 PM | #7 | |
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02-28-2017, 03:11 PM | #8 |
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02-28-2017, 04:00 PM | #10 |
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03-03-2017, 10:52 PM | #11 |
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Hey it says your inbox is full and it won't let me private message you. But I wanted to as what company is the product from and will it automatically clear my cel or will I have to do it manually Everytime?
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