Sudden acceleration & crash!

RJC-1 · 03-01-2023, 01:13 PM

Quote:

Originally Posted by TupperBMW

^ That's because we have the M850i and we're inferior. The M8 doesn't have these types of petty issues

LOL, but Vic55 has an M8 and his seems to be affected as well

Vic55 · 03-01-2023, 01:17 PM

Quote:

Originally Posted by RJC-1

LOL, but Vic55 has an M8 and his seems to be affected as well

different effect --- its the engine over rev'ing

RJC-1 · 03-01-2023, 01:19 PM

Quote:

Originally Posted by Vic55

different effect --- its a the engine over rev'ing

That's exactly what my M850 does and if in gear it could cause an unintended acceleration type situation - as you mentioned crashing into a wall.

Tenac · 03-01-2023, 01:32 PM

Quote:

Originally Posted by RJC-1

LOL, but Vic55 has an M8 and his seems to be affected as well

lets face it Vic55 M8 is basic bitch status though...

Vic55 · 03-01-2023, 01:35 PM

Quote:

Originally Posted by Tenac

lets face it Vic55 M8 is basic bitch status though...

yep I treat it like one--- slap that pedal hard baby

no pussy foot shit here

RJC-1 · 03-01-2023, 02:34 PM

Quote:

Originally Posted by Vic55

no pussy foot shit here

I hereby nominate Vic55 to be the forum spokesperson to BMW USA

Rob_G77 · 03-01-2023, 03:01 PM

Quote:

Originally Posted by RJC-1

I have noticed my M850's idle will surge significantly at times after a warm (not hot) re-start, like after I wash it. It certainly isn't normal and the first few times I had to check to see if the floor mat was getting stuck up against the gas pedal which of course it wasn't.

I've never experienced this on my stock 2022 M850i.

Rob

secretariat · 03-01-2023, 03:54 PM

OP I'm glad your OK and no one got hurt, but it just crossed my mind what if someone was standing in front of that wall? Geez

RJC-1 · 03-01-2023, 04:18 PM

Quote:

Originally Posted by Rob_G77

I've never experienced this on my stock 2022 M850i.

Rob

Glad to hear, keep an eye out.

mcsarna · 03-01-2023, 05:29 PM

Quote:

Originally Posted by RJC-1

I have noticed my M850's idle will surge significantly at times after a warm (not hot) re-start, like after I wash it. It certainly isn't normal and the first few times I had to check to see if the floor mat was getting stuck up against the gas pedal which of course it wasn't.

I got a call from BMW USA today. They are taking my issue pretty seriously they told me. One question I was asked about the episode was, 'did you hear the RPMs suddenly go up?' I told them that it happened so suddenly, that all I could think of was to break hard & I honestly couldn't say one way or the other about the RPMs. Seems to me that they are aware of the sudden RPM surge that you describe.

mcsarna · 03-01-2023, 05:33 PM

Quote:

Originally Posted by secretariat

OP I'm glad your OK and no one got hurt, but it just crossed my mind what if someone was standing in front of that wall? Geez

Right?! Or as a coworker said, 'imagine if that happened as you were driving to the edge of a cliff to watch the sunset!!

RJC-1 · 03-01-2023, 06:16 PM

Quote:

Originally Posted by mcsarna

I got a call from BMW USA today. They are taking my issue pretty seriously they told me. One question I was asked about the episode was, 'did you hear the RPMs suddenly go up?' I told them that it happened so suddenly, that all I could think of was to break hard & I honestly couldn't say one way or the other about the RPMs. Seems to me that they are aware of the sudden RPM surge that you describe.

Interesting, again this never happens at FOT or cold, but just when warm. Perfect example - you’ve driven your car home, let it cool off for about an hour so you can wash it and the brakes are not too hot, then after washing you go to start it to pull into the garage, the idle while in park goes from the normal ~850 rpm to 1500+ and will remain there for 5-10 seconds. I guess if someone’s not aware and shifts into drive thinking the vehicle will just creep forward at a normal idle speed, it will be double that and could potentially cause an incident. Hope this helps a bit.

mjr24 · 03-01-2023, 06:50 PM

What does the car idle in sport plus? 1k?

Does the idle go down if you press the brake? If so, is it lurching back up to normal after?

I swear my M5 did this, too, because I remember almost hitting something in front of me while pulling the car into the garage. If I remember correctly, I feel it got better once I got used to the brake pressure and how much was needed to kind of roll the car forward.

I wonder if you were pressing the brake but not as much as you thought you were….and it allowed it to roll forward.

Westy · 03-01-2023, 07:39 PM

This scared me just reading it 🫣

I have the same car, in all fairness I’ve found the driver assist amazing on the motorway in particular (“freeway” for all those in the US) and I’ve started using the park assist recently, not because I need but I just think it’s dead cool.
I’m suddenly a little bit concerned, what if it does something random while travelling at high speed? I had assumed that it was absolutely 100% failsafe because it simply wouldn’t be allowed on the car if it wasn’t. Clearly I have slightly too much faith.
Glad you’re ok, please share the outcome, would be very interested to know what they say and how much responsibility they admit to 🤔

Seaford · 03-03-2023, 02:52 AM

Quote:

Originally Posted by mcsarna

Thanks for the info. All I can say is the car definitely took on a life of its own and accelerated while my foot was on the brake! No sensors went off, no autobreaking! Nothing!!

Not being funny - Are you 100% certain you didn’t stamp on the throttle rather than the brake?

Presumably the bmw experts have had a look at this?

I only ask as barely a month goes by where there isn’t the report of someone doing exactly that..the average age here is around 103 though

brlawyer · 03-03-2023, 04:46 AM

Quote:

Originally Posted by Seaford

Not being funny - Are you 100% certain you didn’t stamp on the throttle rather than the brake?

Presumably the bmw experts have had a look at this?

I only ask as barely a month goes by where there isn’t the report of someone doing exactly that..the average age here is around 103 though

I agree with your assessment - the only time I faced such a really defective situation was when driving my brother-in-law's old US car (Saturn or so from the 90s); it had automatic transmission and kept accelerating even without pressing anything - something to do with a ruptured speed control cable or similar issue.

Such a mistake is more common than we think; we are in a confined space and our foot can easily touch the wrong pedal.

mcsarna · 03-03-2023, 08:56 AM

Quote:

Originally Posted by Seaford

Not being funny - Are you 100% certain you didn’t stamp on the throttle rather than the brake?

Presumably the bmw experts have had a look at this?

I only ask as barely a month goes by where there isn’t the report of someone doing exactly that..the average age here is around 103 though

I can't tell you how many times I have relived the sordid episode in my head & thought about every possibility including what you mention. Its the sudden acceleration without any warning sensors going off or the autobrakes kicking in & no assist with the breaks as I was flooring the brake pedal that convinces me it was a malfunction.
Let's see what the BMW NA investigators find......

TupperBMW · 03-03-2023, 02:03 PM

I don’t understand how the car can override the brakes. Literally, the calipers should be pressing the brake pads against the rotors at that moment. By what mechanism is this even possible?

RJC-1 · 03-03-2023, 02:35 PM

Quote:

Originally Posted by TupperBMW

I don’t understand how the car can override the brakes. Literally, the calipers should be pressing the brake pads against the rotors at that moment. By what mechanism is this even possible?

What may be happening is: the brake is released expecting a normal idle acceleration at say ~800, yet the rpms are double that, so when releasing the brake the vehicle lunges forward...

ksa · 03-03-2023, 03:52 PM

All I can say is I hope there is a way to tell that it was in fact the car that did this (blackbox hopefully) and not a user error cause I can see the dealer, maker, insurance everyone saying it's not possible unless the most obvious proof slaps them in the face.

Tenac · 03-03-2023, 03:59 PM

Quote:

Originally Posted by RJC-1

What may be happening is: the brake is released expecting a normal idle acceleration at say ~800, yet the rpms are double that, so when releasing the brake the vehicle lunges forward...

But the poster said they were on the brakes hard as they could be....

RJC-1 · 03-03-2023, 04:01 PM

Quote:

Originally Posted by Tenac

But the poster said they were on the brakes hard as they could be....

Was that before or after the unintended acceleration? If it was before then I have no explanation at this point.

03-01-2023, 03:54 PM	#30
secretariat Major 954 Rep 1,457 Posts Drives: 2016 X5M Join Date: Dec 2012 Location: New York iTrader: (0)	OP I'm glad your OK and no one got hurt, but it just crossed my mind what if someone was standing in front of that wall? Geez
	Appreciate 1 mcsarna22.00 Quote

03-01-2023, 06:50 PM	#35
mjr24 Colonel 1652 Rep 2,402 Posts Drives: M8 Comp GC, X7, AMG GT53 Join Date: Mar 2008 Location: Wisconsin iTrader: (0)	What does the car idle in sport plus? 1k? Does the idle go down if you press the brake? If so, is it lurching back up to normal after? I swear my M5 did this, too, because I remember almost hitting something in front of me while pulling the car into the garage. If I remember correctly, I feel it got better once I got used to the brake pressure and how much was needed to kind of roll the car forward. I wonder if you were pressing the brake but not as much as you thought you were….and it allowed it to roll forward. __________________ 2022 M8 Comp GC, 2021 AMG GT53, 2022 X5M Competition, 2021 X7 40i, 2019 M5, 2018 M550I, 2017 Audi Q7, 2014 M6 GC, 2013 Mercedes CLS550, 2011 750LI, 2008 M6 Cabrio, 2008 Porsche Cayenne S, 2004 Mercedes SL55 AMG, 2003 Mercedes SL500, 2000 Mercedes CL500, 1993 Lexus SC400, 1989 525i, 1985 318i
	Appreciate 0 Quote

03-01-2023, 07:39 PM	#36
Westy Private 162 Rep 92 Posts Drives: G15 M850i Join Date: Feb 2023 Location: Basingstoke iTrader: (0)	This scared me just reading it 🫣 I have the same car, in all fairness I’ve found the driver assist amazing on the motorway in particular (“freeway” for all those in the US) and I’ve started using the park assist recently, not because I need but I just think it’s dead cool. I’m suddenly a little bit concerned, what if it does something random while travelling at high speed? I had assumed that it was absolutely 100% failsafe because it simply wouldn’t be allowed on the car if it wasn’t. Clearly I have slightly too much faith. Glad you’re ok, please share the outcome, would be very interested to know what they say and how much responsibility they admit to 🤔
	Appreciate 2 mcsarna22.00 Volcanic168.00 Quote

03-03-2023, 02:03 PM	#40
TupperBMW Captain 994 Rep 761 Posts Drives: 2022 M850i Gran Coupe Join Date: Nov 2021 Location: Chicago area iTrader: (0)	I don’t understand how the car can override the brakes. Literally, the calipers should be pressing the brake pads against the rotors at that moment. By what mechanism is this even possible?
	Appreciate 2 Volcanic168.00 Tenac4538.50 Quote

03-03-2023, 03:52 PM	#42
ksa Major 1070 Rep 1,393 Posts Drives: Aston Martin Vantage & others Join Date: Aug 2015 Location: Alberta/Canada iTrader: (3)	All I can say is I hope there is a way to tell that it was in fact the car that did this (blackbox hopefully) and not a user error cause I can see the dealer, maker, insurance everyone saying it's not possible unless the most obvious proof slaps them in the face.
	Appreciate 0 Quote