02-17-2017, 02:12 PM | #23 |
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I have not gotten the lean codes again after Mission Performance tweaked my tune to accommodate for the RK intakes and DPs (which were installed after my initial tune).
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12-04-2017, 06:05 AM | #25 |
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Have vrsf catless downpipes and front grill intakes with no tune
Getting the 118110 code. It’s cold here now around 32F or 0C 2 new maf, 2 new o2, new plugs and coils were put in. Is this just because of the intake and downpipes? Is it okay to ignore thisncode ? Only option is to be tuned? |
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12-04-2017, 05:39 PM | #26 |
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You need to see your multiplicative adaptions and if you are withing 20%, you are fine aside from having the CEL pop up now and then.
Running lean on these cars is a little miss understanding that some people face. These cars can adapt to run +/-34% fueling if needed to be, though CEL will get triggered when they pass 15/18%. What that means is that if you fill a little too much of E85, your DME might need to add 20% of fueling to maintain proper AFR. That is completely safe and your car is in no way running "Lean" but you will get a code for "lean" condition since the adaptation passed the threshold. |
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12-01-2018, 01:28 AM | #28 |
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12-04-2018, 04:53 AM | #30 |
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i got code 118111 bank 2 mixture too rich , intake and dp with ots stage 2, i clear the codes and gone, i will see if that coming again, but what i have to check if came again...
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12-12-2018, 09:53 AM | #33 | |
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I'm curious because my check engine light popped on as soon as I started my car this morning and last time this happened it was for mixture too lean in bank 1 but I cleaned my MAF's and it went away now 2 months later it's back. I'm on stock tune and only have muffler delete and front grille mount intakes. |
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12-13-2018, 02:25 AM | #35 |
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01-02-2019, 10:48 AM | #36 |
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I'm getting 118010 even after cleaning my MAFs and also replacing them with new inserts.
Its been in and out of the dealership at least 5 times for the CEL,.. they shotgunned the repair and still didnt fix it. The replaced 8 injectors, 8 sparkplugs, 8 coil packs, both cat converters and also updated the software. The MAFs were as old as the car (2013, 62k miles) and I'm guessing the O2 sensors are also. I'll be replacing them next if I cant come up with any other reason. I monitored the STFT and LTFT values via Carly while connected to OBD,.. LTFT on one bank is around 24-25, the other is around 21-22.. before the MAF cleaning/replacing, they were both down in the 10s Car has no mods, factory intake.. only carbon filter delete.
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01-02-2019, 12:11 PM | #37 | |
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Is the engine running lean on both banks? It's unlikely to have more than 1 faulty o2 sensor. Judging by your fuel trim, the ecu is adding fuel to compensate for a lean condition which I'm sure you already knew. Providing you have checked everything else you can add propane or another source of fuel to the intake to see if the sensors respond and the ecu alters fuel trims to suit. (Do this at your own risk, don't add to much fuel if it's in liquid form, I.e. brake cleaner.) I don't think the M5 has intake vacuum so the chances of a vacuum leak causing this are unlikely. You could have a fuel pressure problem. I don't want to become a keyboard mechanic but hoping to give you a few pointers before you go changing anymore parts. |
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01-02-2019, 12:21 PM | #38 | |
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Dealer replaced the crankcase vent tubes noting a crack was found on one after a smoke test. They smoke tested the system and did not find any other leaks. Right now only 1 bank is faulting lean.. occasionally i do see an error on bank 2 but it clears up on its own. The bank 1 lean comes back immediately after clearing
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01-02-2019, 12:50 PM | #39 | |
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As it's on one bank only then you could have a faulty o2. The way to check this is by looking at the live reading given from the o2s on that bank and add fuel/propane to the cylinders on that bank and check for sensor response using live data. |
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01-04-2019, 11:02 AM | #40 | |
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I dont have the capability to reset mixture adaptations. If I do not find a leak anywhere, then I am left to think that either the O2 sensors are not reading correctly or the fuel tank vent hoses & sensors will need to be replaced. I checked both DTC faults on http://bmwfault.codes/ , and they're general condition is linked to "- Tank ventilation system not active."
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02-07-2019, 10:39 AM | #41 |
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Following up to my last post,... turned out that there were no leaks. I had the engine smoke tested, nothing found.
Pretty sure the lingering CEL was related to old adaptations that I could not reset myself since I did not have a tool capable of clearing them. I took it to a shop that cleared them with the Autologic, and viola! no more CEL. It used to turn on immediately after clearing and restarting the car, now it does not turn on at all anymore. So summary, clearing adaptations when getting those lean codes if no leaks are present should be all you need. Also worth giving the MAFs a cleaning too.
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