M5 f10 idle RPM issue- video attached

aous101 · 06-07-2020, 02:27 PM

Hi guys,

I have been noticing a slight movement with my RPM at idle when car is warm and AC is on. There is slight vibration that comes and go as well when the RPM moves. It can be barely felt via the seats. Maybe I'm being paranoid after all, not sure

. Here is a video for the movement I'm talking about.

Do you think it's normal? If not, what can be possibly wrong.

Any suggestions are welcomed.

P.s car is stock with cat back FI exhust and has 90,000 km on. No errors found using ODB2 scanner. Spark plugs were changed 3 months ago. Injector along with throttle body were cleaned as well. Replaced 2 MAF Sensors, along with OEM alternator which died a month ago.

SapphireM5 · 06-08-2020, 06:56 PM

Could just be the ac compressor engaging, nothing to worry about. If you shut the ac off does it not do it? If it stops w the ac off I wouldnt worry about it. Either way seems like nothing to be concerned about.

mundo74 · 06-09-2020, 01:00 PM

Paranoid. Mine gets 10 time worse sometimes, fluctuating 300 RPM. Luckily it only does it rarely.

Noggie · 06-09-2020, 02:22 PM

Quote:

Originally Posted by SapphireM5

Could just be the ac compressor engaging, nothing to worry about. If you shut the ac off does it not do it? If it stops w the ac off I wouldnt worry about it. Either way seems like nothing to be concerned about.

This was my thought exactly.

PoolCar · 06-09-2020, 03:08 PM

Quote:

Originally Posted by aous101

Hi guys,

I have been noticing a slight movement with my RPM at idle when car is warm and AC is on. There is slight vibration that comes and go as well when the RPM moves. It can be barely felt via the seats. Maybe I'm being paranoid after all, not sure

. Here is a video for the movement I'm talking about.

Do you think it's normal? If not, what can be possibly wrong.

Any suggestions are welcomed.

P.s car is stock with cat back FI exhust and has 90,000 km on. No errors found using ODB2 scanner. Spark plugs were changed 3 months ago. Injector along with throttle body were cleaned as well. Replaced 2 MAF Sensors, along with OEM alternator which died a month ago.

I honestly saw nothing!

aous101 · 06-09-2020, 03:24 PM

Thank you all for the feedback. When I turn the ac off, it stabilise and the slight vibration goes away.

I guess I need to take it easy on my OCD

SapphireM5 · 06-09-2020, 04:48 PM

Quote:

Originally Posted by aous101

Thank you all for the feedback. When I turn the ac off, it stabilise and the slight vibration goes away.

I guess I need to take it easy on my OCD

I am very OCD so I get it, but that's nothing to even consider an issue.

q94f10 · 06-16-2020, 11:11 PM

My 2015 m6 gc would do that also. Indy shop couldn't find anything wrong with it. I did recently install the bms intakes and it made it worst, but only during startup, esp when the car has been sitting in the sun for a while. Once its moving and comes to a stop the rpm barely fluctuate. I think these cars are very sensitive to temp of air going into intakes and that causes MAF sensor to fluctuate the rpm based on air density.

Craze · 06-17-2020, 03:31 AM

Seems normal
2 s63 motors in the house and both similar

Noggie · 06-17-2020, 11:04 AM

Funny story.

A friend of mine pulled a trick on me many years ago when I had an E36 sedan.

He was in the back seat, and when he pushed the button to close the rear door window, which was closed, the car would do a small rpm drop.

He then got my attention to this and kept pressing the button at various intervals while we were waiting for another passenger.
He borderline got me to think that there was an issue with the car before laughing and telling me what he did.

S_CDSM5 · 06-17-2020, 12:19 PM

Mine certainly has this very slight RPM fluctuation but only notice it when first starting it up once the high idle is done. Once its warm i notice nothing

Aceway · 02-21-2021, 08:28 PM

Fixed my rpm fluctuation issue. Rpm would fluctuate at idle even when fully warmed up with a considerable amount of driving time. Initially I cleaned my MAF sensors which did not make a difference. I order a new pair of MAF sensors and O2 sensors. Fixed my issue, I'm going to guess it was O2 sensors but who knows now. My car is at 73k miles, problem popped up pretty recently.

Honestly I'm so happy it wasn't injectors although I'm sure that's in my future. Not even mad that I dropped one of bolts to the brace above the o2 sensors.

06-07-2020, 02:27 PM	#1
aous101 Registered 1 Rep 3 Posts Drives: BMW M5 F10 Join Date: Oct 2018 Location: UAE iTrader: (0)	M5 f10 idle RPM issue- video attached Hi guys, I have been noticing a slight movement with my RPM at idle when car is warm and AC is on. There is slight vibration that comes and go as well when the RPM moves. It can be barely felt via the seats. Maybe I'm being paranoid after all, not sure . Here is a video for the movement I'm talking about. Do you think it's normal? If not, what can be possibly wrong. Any suggestions are welcomed. P.s car is stock with cat back FI exhust and has 90,000 km on. No errors found using ODB2 scanner. Spark plugs were changed 3 months ago. Injector along with throttle body were cleaned as well. Replaced 2 MAF Sensors, along with OEM alternator which died a month ago.
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06-08-2020, 06:56 PM	#2
SapphireM5 Major 711 Rep 1,107 Posts Drives: 2013 M5 Sapphire Black Join Date: Feb 2017 Location: New Jersey iTrader: (3)	Could just be the ac compressor engaging, nothing to worry about. If you shut the ac off does it not do it? If it stops w the ac off I wouldnt worry about it. Either way seems like nothing to be concerned about. __________________ '13 Black Sapphire Metallic - BPM Stage 1 Tune - RPI Exhaust - KW HAS Kit - 12mm spacers all around- Carbon Fiber front lip - High Kick Trunk Spoiler - Rear Roof Spoiler - IND Kidney and Fender Grills - 20% Tint all around 50% Front Windshield - PPF
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06-09-2020, 01:00 PM	#3
mundo74 Lieutenant 65 Rep 563 Posts Drives: F10M5 Join Date: Oct 2005 Location: P.Pines, FL iTrader: (2)	Paranoid. Mine gets 10 time worse sometimes, fluctuating 300 RPM. Luckily it only does it rarely. __________________ More power please
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06-09-2020, 03:24 PM	#6
aous101 Registered 1 Rep 3 Posts Drives: BMW M5 F10 Join Date: Oct 2018 Location: UAE iTrader: (0)	Thank you all for the feedback. When I turn the ac off, it stabilise and the slight vibration goes away. I guess I need to take it easy on my OCD
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06-16-2020, 11:11 PM	#8
q94f10 Enlisted Member 6 Rep 30 Posts Drives: retired: 2015 M6 GC Join Date: Sep 2016 Location: new york city iTrader: (0)	My 2015 m6 gc would do that also. Indy shop couldn't find anything wrong with it. I did recently install the bms intakes and it made it worst, but only during startup, esp when the car has been sitting in the sun for a while. Once its moving and comes to a stop the rpm barely fluctuate. I think these cars are very sensitive to temp of air going into intakes and that causes MAF sensor to fluctuate the rpm based on air density.
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06-17-2020, 03:31 AM	#9
Craze Captain 161 Rep 687 Posts Drives: M5 E60, M5 F10, X5 50i Join Date: Oct 2017 Location: Australia iTrader: (0)	Seems normal 2 s63 motors in the house and both similar
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06-17-2020, 11:04 AM	#10
Noggie Captain 285 Rep 634 Posts Drives: E31 850i,i3s Join Date: May 2014 Location: Norway iTrader: (0)	Funny story. A friend of mine pulled a trick on me many years ago when I had an E36 sedan. He was in the back seat, and when he pushed the button to close the rear door window, which was closed, the car would do a small rpm drop. He then got my attention to this and kept pressing the button at various intervals while we were waiting for another passenger. He borderline got me to think that there was an issue with the car before laughing and telling me what he did.
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06-17-2020, 12:19 PM	#11
S_CDSM5 Private 42 Rep 73 Posts Drives: 650 Gran Coupe Join Date: Feb 2020 Location: The burbs iTrader: (0)	Mine certainly has this very slight RPM fluctuation but only notice it when first starting it up once the high idle is done. Once its warm i notice nothing
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02-21-2021, 08:28 PM	#12
Aceway Captain 455 Rep 875 Posts Drives: E82 135i / F25 28i Join Date: Feb 2018 Location: SoCal iTrader: (2)	Fixed my rpm fluctuation issue. Rpm would fluctuate at idle even when fully warmed up with a considerable amount of driving time. Initially I cleaned my MAF sensors which did not make a difference. I order a new pair of MAF sensors and O2 sensors. Fixed my issue, I'm going to guess it was O2 sensors but who knows now. My car is at 73k miles, problem popped up pretty recently. Honestly I'm so happy it wasn't injectors although I'm sure that's in my future. Not even mad that I dropped one of bolts to the brace above the o2 sensors.
	Appreciate 0 Quote