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04-14-2018, 09:50 PM | #23 |
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04-15-2018, 09:35 AM | #24 |
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I just learned about Valvetronic. I guess I am behind on the times. BMW claims the intake valves close in .3 of a second. There is a throttle body as a fail safe. So why is the car still accelerating for 2-3 seconds? Thanks for filling me in gingerbread
This is a serious concern and it appears that this might be happening on more than a few cars. Of course no codes get stored when this happens. I'm sure this is what they will tell Bem4 as well. Last edited by delfunk; 04-16-2018 at 10:47 AM.. |
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04-16-2018, 12:43 AM | #25 | |
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04-16-2018, 08:50 AM | #26 |
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Maybe take some WD-40 and clean under your accelerator pedal?
Could be some dirt or gunk that might be making the pedal sticky? Just a thought
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04-16-2018, 10:48 AM | #27 |
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This has only happened to me while driving straight thankfully. I will examine the throttle pedal but I believe the dealer has already done that.
I will take it in again and have BMW look into the valvetronic issues. |
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04-16-2018, 06:42 PM | #28 | |
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My dealer appt. got pushed to Wed. I’ll be sure to ask about it |
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04-24-2018, 10:56 AM | #29 |
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After taking the car in four times for this BMW finally agreed to reprogram my computer. Here is what the service rep said:
"Your concern was that the Valvetronic did not function properly. We did not find any relevant faults stored. We contacted BMW, as per their request we performed programming and complete encoding. Initialized windows. Perform valvetronic test plans and ran without faults. Vehicle is operating to specs." Bem4 maybe they can do this for you? Might help. |
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04-26-2018, 07:43 AM | #30 |
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It has happened to me around 2 times in the past 1 1/2 years, and only after hard acceleration then letting go, the car just kept going for a couple seconds. I drive a F80 ZCP
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04-26-2018, 07:44 AM | #31 | |
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your own thread that is According to the video, that was back in 2001. In those days, BMW ///M assessed that this type of response was not sharp enough for the sporty characteristics of an "S" ///M engine, hence why the S54, S85 and S65 still had individual port throttle bodies. However, with the S63 and S55, the Valvetronic technology had evolved sufficiently for ///M to use it in their engines. I have to assume that modern Valvetronic has a much faster response than the 0.3 seconds referred to in the video.
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04-26-2018, 08:57 AM | #32 | |
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Maybe you are confusing from your readings the DSC interaction with the DCT and e-Diff, where the DSC can command the DCT to open both clutches and/or the e-diff to lock/unlock on decel when slip is detected.
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06-06-2018, 03:54 AM | #33 |
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Any updates on this? Im having the same issue on my 2015 m3. When i go from 100% throttle in 2nd and shift to 3rd and let go of the gas pedal, it continues to accelerate at around 3k-4k rpm, I have to mash the brake for it to stop accelerating. My car is completely stock and it happens in Sport+ with MDM. Also have noticed it happen when im in traffic and trying to do short pulls.
I managed to record the incident on my go pro with M lap timer |
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06-08-2018, 12:37 PM | #34 | |
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You seem to have documented your issue well. Let us know how it goes when you mention this. |
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08-28-2018, 12:33 AM | #36 | |
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They can't duplicate it and they tell me there are no relevant fault codes although the ZGM module failed to sync several times. |
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10-08-2018, 02:06 PM | #37 | |
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Nhtsa.gov |
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09-26-2020, 12:07 AM | #39 | |
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Let off the throttle and expected to decelerate but the car kept increasing in speed for about 1-2 seconds before I got on the brakes in reaction to the increasing speed which seems to have canceled the acceleration. Luckily there were no cars around. But that’s a terrifying issue to have. Really hope to not experience it again. Has anybody been able to find the actual cause of this? |
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09-26-2020, 07:48 AM | #40 | |
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Sorry didn't mean to go off topic |
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09-26-2020, 08:14 AM | #41 | |
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09-26-2020, 11:47 AM | #43 |
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Reluctant to question someone's lived experiences, but have to wonder if F8X sport plus throttle setting and this issue are coincidence.
There is no deadzone at the top of the throttle in this setting, it is effectively on/off. I would find an empty road, do the 2nd to 3rd gear pull you detail 10x. Make sure with each one you're fully off the throttle -- as in, snap your foot off the gas like it's on fire. if you aren't able to replicate the issue, then you might consider "user error" being a potential cause of the prior experience. Again, where user error would be as small as continued slight pressure on the gas when you thought you were fully off.
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