Sudden acceleration at stop light

PhatLyfe · 03-11-2020, 09:01 AM

Anyone getting this sudden acceleration issues while waiting at a stop light? The engines revs rpm's near 2k and you pushing the. I have t push the brake pedal hard to the floor so you don't ram the guy in the front of you. When the light turn green let go of the brake and the revs go back down. Is it me or the car? I'm booked a service call in for tomorrow morning and see what is going on in my 2018 F83. This has happens 3 times this week, I can't be gas, I only use premium fuel and these is not jerky or hesitation while driving. I've turned off the auto off feature in the car and this still keeps on happening, has anyone gone through these issues? Or it's a fluke?

thestimp · 03-11-2020, 09:07 AM

The engine at a complete stop should not creep because there is no torque converter to push it. You have to lightly tap the gas pedal to initiate "slow motion crawl". If it is revving with the brake ON then there is something wrong with either the fly by wire pedal, or the engine itself.

This may sound dumb, but check your carpet on the floor, it could be pushing the pedal unknowingly.

behindthen0thing · 03-11-2020, 09:07 AM

WHAT?!

PhatLyfe · 03-11-2020, 09:11 AM

Quote:

Originally Posted by thestimp

The engine at a complete stop should not creep because there is no torque converter to push it. You have to lightly tap the gas pedal to initiate "slow motion crawl". If it is revving with the brake ON then there is something wrong with either the fly by wire pedal, or the engine itself.

This may sound dumb, but check your carpet on the floor, it could be pushing the pedal unknowingly.

I've checked and it's not the carpet, it randomly does this when your at the light with the foot on the brake. If I don't hold on the brake , sometime pushing it down, I may plow into the person in front of me. I thought it was. Fluke a few months ago and it's happened again, I've made an appointment tomorrow to drop the car off and see what they find. I love the car , but don't need a mind of its own either. Once I let go of the brake pedal the revs come back down below 1k as normal. That is the weird part about it.

White340 · 03-11-2020, 09:37 AM

Take a video as evidence when it happens again

Dinh335 · 03-11-2020, 10:08 AM

Quote:

Originally Posted by PhatLyfe

I've checked and it's not the carpet, it randomly does this when your at the light with the foot on the brake. If I don't hold on the brake , sometime pushing it down, I may plow into the person in front of me. I thought it was. Fluke a few months ago and it's happened again, I've made an appointment tomorrow to drop the car off and see what they find. I love the car , but don't need a mind of its own either. Once I let go of the brake pedal the revs come back down below 1k as normal. That is the weird part about it.

Not trying to be silly here, are you sure you're not pressing both the brake and the gas? BMW brakes and Gas are close together, more of a 'toe and side foot' than a heel n toe setup. Would also explain why it stops when you release the brake.

Beemerm3 · 03-11-2020, 10:44 AM

Maybe u got bad spark plugs.

Jason60051 · 03-11-2020, 11:13 AM

Quote:

Originally Posted by Dinh335

Quote:

Originally Posted by PhatLyfe

I've checked and it's not the carpet, it randomly does this when your at the light with the foot on the brake. If I don't hold on the brake , sometime pushing it down, I may plow into the person in front of me. I thought it was. Fluke a few months ago and it's happened again, I've made an appointment tomorrow to drop the car off and see what they find. I love the car , but don't need a mind of its own either. Once I let go of the brake pedal the revs come back down below 1k as normal. That is the weird part about it.

Not trying to be silly here, are you sure you're not pressing both the brake and the gas? BMW brakes and Gas are close together, more of a 'toe and side foot' than a heel n toe setup. Would also explain why it stops when you release the brake.

I was thinking the exact same thing. The gas and brake pedal are much closer together than most vehicles. Depending on the size of your shoe it can happen.

wdskukm3 · 03-11-2020, 11:45 AM

There might be a ghost rider. Lol!!! But yea let us know what the service dept says.

PhatLyfe · 03-11-2020, 12:13 PM

Quote:

Originally Posted by M3classic

Maybe u got bad spark plugs.

Plus bad already @ 7k miles? I'm dropping it off tomorrow and hopefully they find the issue.. it's just odd it happens randomly

behindthen0thing · 03-11-2020, 01:36 PM

Quote:

Originally Posted by M3classic

Maybe u got bad spark plugs.

That wouldn't cause an issue like this at all. Nowhere even close partner

behindthen0thing · 03-11-2020, 01:38 PM

To me this sounds like a sensor issue or a computer problem. The dealer will need to run tests with ista to check for any errors and I wouldn't be surprised if they ended up changing a box or two. Or they might just kick it back and say cannot duplicate

Aaaaaaaaa · 03-11-2020, 01:46 PM

What size shoes does you wear

nicknaz · 03-11-2020, 03:03 PM

My $0.02, dash cam + foot cam to help make your case

Good luck.

Never happened in my ‘15 dct but that’s something to dig into for sure.

jpy1980 · 03-11-2020, 04:31 PM

Quote:

Originally Posted by Jason60051

I was thinking the exact same thing. The gas and brake pedal are much closer together than most vehicles. Depending on the size of your shoe it can happen.

This happens to me sometimes but I have a manual. It makes it real easy to heel toe but sometimes when I brake using the big toe part of my shoe, the shoe hits the gas at times.

RickFLM4 · 03-11-2020, 04:52 PM

Quote:

Originally Posted by Dinh335

Not trying to be silly here, are you sure you're not pressing both the brake and the gas? BMW brakes and Gas are close together, more of a 'toe and side foot' than a heel n toe setup. Would also explain why it stops when you release the brake.

My betting money would be on this.

Isj · 03-11-2020, 08:27 PM

I wear wide shoes and this happens to me once in awhile, you're hitting the gas and brake at the same time.

dezzracer · 03-13-2020, 01:41 AM

Quote:

Originally Posted by behindthen0thing

WHAT?!

There was a recall for this on 03:04 Cobra's. Modified floor mats. As k me how I know.

behindthen0thing · 03-13-2020, 03:12 AM

Quote:

Originally Posted by dezzracer

There was a recall for this on 03:04 Cobra's. Modified floor mats. As k me how I know.

How do you know?

PhatLyfe · 03-13-2020, 06:45 PM

I got the car back today, they did a computer software update , programming/encoding control units per tse. I don't know what that means..

I had no issue driving the car home.. odd the tech's and service advisor and manager to take the car out more? i don;t take the car out under 45 degrees since summer tires are on the car.. he said i need to open up the car to burn all the carbon deposits out. I use premium fuel, there should be no carbon deposits in the car..

PhatLyfe · 03-13-2020, 06:46 PM

Quote:

Originally Posted by SD ///M3

What size shoes does you wear

i have small narrow feet , size 9

Beemerm3 · 03-14-2020, 01:45 PM

Quote:

Originally Posted by behindthen0thing

That wouldn't cause an issue like this at all. Nowhere even close partner

If it's not spark plugs then what is it?

03-11-2020, 09:01 AM	#1
PhatLyfe Major 985 Rep 1,144 Posts Drives: 2018 F83 AW/SO ZCP Join Date: Jul 2016 Location: Somerset County iTrader: (0)	Sudden acceleration at stop light Anyone getting this sudden acceleration issues while waiting at a stop light? The engines revs rpm's near 2k and you pushing the. I have t push the brake pedal hard to the floor so you don't ram the guy in the front of you. When the light turn green let go of the brake and the revs go back down. Is it me or the car? I'm booked a service call in for tomorrow morning and see what is going on in my 2018 F83. This has happens 3 times this week, I can't be gas, I only use premium fuel and these is not jerky or hesitation while driving. I've turned off the auto off feature in the car and this still keeps on happening, has anyone gone through these issues? Or it's a fluke? Last edited by PhatLyfe; 03-11-2020 at 12:11 PM..
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03-11-2020, 09:07 AM	#2
thestimp Lieutenant Colonel 975 Rep 1,700 Posts Drives: 22 X3MC MBB - C-17 Globemaster Join Date: Jun 2014 Location: Pittsburgh, PA iTrader: (1) Garage List 2022 X3mC [10.00] 2016 BMW M3 [0.00]	The engine at a complete stop should not creep because there is no torque converter to push it. You have to lightly tap the gas pedal to initiate "slow motion crawl". If it is revving with the brake ON then there is something wrong with either the fly by wire pedal, or the engine itself. This may sound dumb, but check your carpet on the floor, it could be pushing the pedal unknowingly.
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03-11-2020, 09:07 AM	#3
behindthen0thing Captain 840 Rep 937 Posts Drives: M4 Join Date: Jul 2018 Location: Germany iTrader: (0)	WHAT?!
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03-11-2020, 09:37 AM	#5
White340 Lieutenant Colonel 1393 Rep 1,986 Posts Drives: 2018 M3 Comp / 2022 X5 45e Join Date: Dec 2015 Location: NYC iTrader: (3)	Take a video as evidence when it happens again __________________ 2022 X5 45e : AW/Tartufo 2018 M3 Competition : AW/SO 2016 340i xDrive : AW/CR (sold)
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03-11-2020, 10:44 AM	#7
Beemerm3 First Lieutenant 59 Rep 345 Posts Drives: 16' BMW m3 Join Date: Jul 2019 Location: Sacramento iTrader: (0)	Maybe u got bad spark plugs.
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03-11-2020, 11:45 AM	#9
wdskukm3 Captain 364 Rep 834 Posts Drives: 2015 F80 M3 and Model P3D Join Date: Oct 2017 Location: Orland Park,IL iTrader: (0)	There might be a ghost rider. Lol!!! But yea let us know what the service dept says. __________________ M Forever!!!!
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03-11-2020, 01:38 PM	#12
behindthen0thing Captain 840 Rep 937 Posts Drives: M4 Join Date: Jul 2018 Location: Germany iTrader: (0)	To me this sounds like a sensor issue or a computer problem. The dealer will need to run tests with ista to check for any errors and I wouldn't be surprised if they ended up changing a box or two. Or they might just kick it back and say cannot duplicate
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03-11-2020, 01:46 PM	#13
Aaaaaaaaa Banned 7559 Rep 5,056 Posts Drives: The other M3 Join Date: Oct 2014 Location: So Cal iTrader: (0)	What size shoes does you wear
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03-11-2020, 03:03 PM	#14
nicknaz Lieutenant General 3187 Rep 10,509 Posts Drives: C6Z Join Date: May 2008 Location: NorCal iTrader: (0)	My $0.02, dash cam + foot cam to help make your case Good luck. Never happened in my ‘15 dct but that’s something to dig into for sure.
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03-11-2020, 08:27 PM	#17
Isj Private First Class 52 Rep 108 Posts Drives: 2018 M2 Join Date: Apr 2018 Location: TX iTrader: (0)	I wear wide shoes and this happens to me once in awhile, you're hitting the gas and brake at the same time.
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03-13-2020, 06:45 PM	#20
PhatLyfe Major 985 Rep 1,144 Posts Drives: 2018 F83 AW/SO ZCP Join Date: Jul 2016 Location: Somerset County iTrader: (0)	I got the car back today, they did a computer software update , programming/encoding control units per tse. I don't know what that means.. I had no issue driving the car home.. odd the tech's and service advisor and manager to take the car out more? i don;t take the car out under 45 degrees since summer tires are on the car.. he said i need to open up the car to burn all the carbon deposits out. I use premium fuel, there should be no carbon deposits in the car..
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