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12-31-2023, 02:48 AM | #45 |
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I would advise to take a moment and read through that entire article in ISTA and then also read Oxygen sensor before catalytic converter. It would give a better insight to those sensors and would also point out that you are looking at wrong sensors. Post cat sensors only measure the efficiency of cats and dont contribute to fuel trim. You need to look at pre cat sensors as these are wide band regulating probes.
Pay special attention to part that relates to reference air. You reference air ports might be plugged, post water fording. You can see data valus if you go to ECU tree, select an ECU (DME in your case) and then press button, I think it was something like "call up ECU functions" or something on lower left corner. There you can trigger different things and view live data. |
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12-31-2023, 09:13 AM | #46 | |
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12-31-2023, 09:15 AM | #47 | |
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12-31-2023, 01:21 PM | #48 |
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12-31-2023, 01:45 PM | #49 | |
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Needless to say, I attached the wire, CEL disappeared, and I drove the car for like 35 minutes and had it at operating temp for at least 30 mins, drove straightaways for several minutes at 40-50 mpg, and no CEL! I am pretty pumped. See image below. Last edited by 750iClown; 12-31-2023 at 02:12 PM.. |
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12-31-2023, 02:43 PM | #50 | |
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12-31-2023, 02:44 PM | #51 | |
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Last edited by M_Bimmer; 12-31-2023 at 02:55 PM.. |
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12-31-2023, 02:53 PM | #52 | |
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I have a pre-LCI G12 N63, which has two MAF sensors just aft the intake filters. Your LCI G12 N63 is a different animal, and I could not find any MAF sensor on your intakes, only a temp sensor. TIS eludes that you have MAF's, but I could not confirm this in any other documentation. Maybe someone that has an LCI G12 N63 can weigh in... |
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12-31-2023, 08:42 PM | #53 | |
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I spoke too soon, P0171 is back. I drove it tonight and it came back on right after starting. Back to square one. Any advice? |
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12-31-2023, 09:09 PM | #54 |
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12-31-2023, 10:45 PM | #55 |
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Will do tomorrow. When you clear the codes, what do the remaining codes or the ones that do not get erased indicate? Conversely, what do the ones that got erased indicate?
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01-01-2024, 11:05 AM | #56 |
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I am just hoping I can fix this on my own. Taking it to BMW to fix this is not out of the question, as I am doing quite well financially, not an issue at all, but I am very mechanically inclined and would hate to give BMW open season with their labor rate at $175 per hour. I have fixed major issues on all my vehicles, but BMW is a new beast all together. I need to tackle this and learn my new vehicle. I hope we can nail this down, would be so rewarding.
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01-01-2024, 11:49 AM | #57 | ||
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To be honest, I dont know if ISTA will run a vehicle check after codes are deleted. Once the PAD mode is reactivated, it only takes seconds to finish the operation which makes me think that complete vehicle check is not automatically performed. Might be worthwhile to press that button so ISTA will run or trigger self diagnosis on all the modules. Mixture control codes can be trickier as these might only pop up during operation. Permanent SAE codes wont be cleared before root issue is rectified, system passes self diagnosis and initiates healing counter. Quote:
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01-01-2024, 01:19 PM | #58 | |
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01-01-2024, 01:23 PM | #59 | |
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01-02-2024, 09:23 AM | #60 |
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01-02-2024, 09:24 AM | #61 | |
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01-02-2024, 01:03 PM | #62 |
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Seeing as you are running lean on both banks, I would check fuel pressures and if everything is okay there, start inspecting parts visually. Either you get too much unmetered air or there is not enough fuel delivered, or both banks have it's regulating loops ruined by water ingestion or other reasons.
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01-02-2024, 04:18 PM | #63 | |
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Also, you or someone else said they couldn't see a MAF sensor anywhere on my beast in the engine pics I attached. Is that true? I would love to find the MAF sensors if they exist and start there with a good MAF sensor cleaning. |
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01-02-2024, 06:19 PM | #64 | |
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In the off chance that I miss guided you, feel free to select the code set in ISTA and run the Test Plan against that code. I circled the rear aerial in the photo: |
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01-02-2024, 06:22 PM | #65 |
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Did you drive around after clearing the "soft" codes? And these are the only two "hard" codes left?
BTW, I'd pull the negative terminal on your battery, let it sit for a few minutes, then reconnect the ground wire to the battery. Run ISTA, clear all the codes. Take the car for a short spin, then post the BMW version of the emission codes. |
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01-02-2024, 06:40 PM | #66 | |
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