11-24-2021, 10:52 AM | #1 |
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Hesitation Issues 3000-4500rpm - BM3 Log
Can anyone give me some insight on this log. 2016 M4 - Having a hesitation between 3000-4500 when pushing gas full throttle. If I ease the gas and do not floor it, it pulls just fine to redline. Only does this on hard acceleration and in ANY mode (sport, sport+) etc. Stage 2 91-93 OTS map
https://www.bootmod3.net/log?id=6193...pUG6DHsHqBo6iA Thanks so much! |
11-24-2021, 02:03 PM | #3 |
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Well maybe not that log showing full throttle but definitely hesitation on that log under heavy acceleration and then I backed off soon as it hesitated ...
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11-24-2021, 02:38 PM | #4 | |
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The only thing that stood out as odd to me was during that brief period of WOT, your WGDC had small oscillation (looks like waves on the graph). From experience, this can lead to choppy boost and make the car feel like its surging/hesitating. Is this what you are describing/experiencing? Is this car stock? OTS tuned? <-- EDIT: I see that its on an OTS map. This can very likely be tune related. Boost oscillation as well as finnicky wastegates can be smoothed out by the tuner. If software changes don't help, then you can start looking mechanically. |
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TSHRTS_M41.50 |
11-24-2021, 02:48 PM | #5 | ||
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11-24-2021, 03:02 PM | #6 |
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I've never logged anything part-throttle so I'm really unsure and don't have a good baseline to compare it against but interestingly your bank 1 AFR shoots up suuuper lean after the 4500 mark vs bank 2 that sticks with the lambda target. Also during this time is when your STFT also split apart and the bank 1 STFT value is lower than bank 2.
When I had a brief moment of this in the tuning process with F80Paul he suggested possible a stuck/leaky injector, but also that resetting the 'learned adaptations' underneath the diagnostics tab was also a good thing to do after changing maps.
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11-24-2021, 03:14 PM | #7 | |
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Nonetheless, good point, heitzke I'll also have to walk back what I said about the oscillation since that happens after 3k-4.5k as well as the touch & go accelerator/throttle input after the initial pull contributing to what I thought was oscillation. WGDC looks okay and boost is smooth in the 3k-4.5k range. Last edited by Donteflon; 11-24-2021 at 03:22 PM.. |
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TSHRTS_M41.50 |
11-24-2021, 03:38 PM | #8 |
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Man, thank you guys for this input so far!! I may have another log, I will see and post if I do. I haven't ran the car for a week.
So as I am taking this I need to "reset adaptations" FIRST and see if that helps? If not should I start looking into a custom tune and getting the injectors looked at? |
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11-24-2021, 03:48 PM | #9 |
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Here is another Log ... This one may be better
https://www.bootmod3.net/log?id=6193...0b4340b876bd26 |
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11-24-2021, 04:19 PM | #10 | |
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Additionally, you're getting timing retardation in Cyls 1-2 which is Bank 1, the same bank where your trims are lean. I don't think this is a coincidence and there is a correlation. When is the last time the plugs have been swapped? If it comes down to it, I'd inspect plugs, replace if needed, recheck, and then move onto inspecting injectors. |
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11-24-2021, 04:44 PM | #11 | |
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11-24-2021, 04:55 PM | #12 | |
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Potentially try what was mentioned above perhaps? Can also consult BM3 and have them take a look and see what they advise. Could be an injector as well as plugs though. I wouldn't rule that out of the realm of possibilities. Last edited by Donteflon; 11-24-2021 at 05:04 PM.. |
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