Boost cut due to MAF sensor?

gasoline · 03-08-2023, 02:46 PM

Hi,
I have been in seek of a problem in my G30 530i xdrive about a boost/torque fluctuation, the problem occurs split a second especially driving uphill.
What can be the reason for this? I feel the torque is fluctuating at its peak point while I am keeping the throttle constant and also see it in the sport screen of torque gauge, but I could not find the reason. The car is accelerating gradually by cut-go-cut-go…I just replaced xfer case fluid but it seems it had no effect.
I would be glad to hear your comments. Some say MAF sensor, can it be?

gasoline · 03-10-2023, 12:53 AM

Does MAF sensor need periodic cleaning? Any comments?

AddyDaddy · 03-10-2023, 04:57 PM

I know when doing filters on my M550i, I was warned about the filter oil coming from ECS or K&N (not sure what one), I dried the filters overnight in paper towels to avoid letting the sensitive MAF sensor get ANY oil on it. Could be issue that they are so sensitive?

gasoline · 03-10-2023, 11:40 PM

Quote:

Originally Posted by AddyDaddy

I know when doing filters on my M550i, I was warned about the filter oil coming from ECS or K&N (not sure what one), I dried the filters overnight in paper towels to avoid letting the sensitive MAF sensor get ANY oil on it. Could be issue that they are so sensitive?

Maybe, I heard similar issues, MAF can get easily contaminated while trying to clean it. But how does a dirty MAF sensor affect the drive, I mean does it shake the car, decrease in power…?

AddyDaddy · 03-11-2023, 06:46 AM

Quote:

Originally Posted by gasoline

Maybe, I heard similar issues, MAF can get easily contaminated while trying to clean it. But how does a dirty MAF sensor affect the drive, I mean does it shake the car, decrease in power…?

Pretty sure if I remember it effected a lot of what you saying from engine getting mixed bad signals of air going into engine. I’d google it. I’m remembering stuff from what I was told so I could be totally incorrect.

gasoline · 03-11-2023, 08:33 AM

Quote:

Originally Posted by AddyDaddy

Pretty sure if I remember it effected a lot of what you saying from engine getting mixed bad signals of air going into engine. I’d google it. I’m remembering stuff from what I was told so I could be totally incorrect.

Thanks for your comments AddyDaddy. I’ve just read very very similar issues today and many of them solved the issue by replacing the VANOS actuators. A few say O2 sensors were to blame.
I will first have replaced the VANOS actuators, hope it will solve. If not then O2 sensors.

gasoline · 03-18-2023, 12:48 PM

Hi, my vanos actuators were replaced today and finally the problem is solved!

03-08-2023, 02:46 PM	#1
gasoline Private 36 Rep 92 Posts Drives: 530i Xdrive Join Date: Dec 2022 Location: Ankara iTrader: (0)	Boost cut due to MAF sensor? Hi, I have been in seek of a problem in my G30 530i xdrive about a boost/torque fluctuation, the problem occurs split a second especially driving uphill. What can be the reason for this? I feel the torque is fluctuating at its peak point while I am keeping the throttle constant and also see it in the sport screen of torque gauge, but I could not find the reason. The car is accelerating gradually by cut-go-cut-go…I just replaced xfer case fluid but it seems it had no effect. I would be glad to hear your comments. Some say MAF sensor, can it be? Last edited by gasoline; 03-08-2023 at 02:55 PM..
	Appreciate 0 Tweet Quote

03-10-2023, 12:53 AM	#2
gasoline Private 36 Rep 92 Posts Drives: 530i Xdrive Join Date: Dec 2022 Location: Ankara iTrader: (0)	Does MAF sensor need periodic cleaning? Any comments?
	Appreciate 0 Quote

03-10-2023, 04:57 PM	#3
AddyDaddy Major 540 Rep 1,064 Posts Drives: i5 M60, M5's, 535.335, M550i Join Date: Jan 2015 Location: Here iTrader: (0) Garage List 2024 i5 M60 [8.25] 2019 BMW M550i Evol ... [7.50]	I know when doing filters on my M550i, I was warned about the filter oil coming from ECS or K&N (not sure what one), I dried the filters overnight in paper towels to avoid letting the sensitive MAF sensor get ANY oil on it. Could be issue that they are so sensitive? __________________ 2013 535i M, Carbon black 20' 6 M wheels, totaled. 2018 750M , 2013 M5 , Individual Silver, Bolt ons-Straight piped 2019 M550 686BK Black Chrome 20"wheels, filters, Evolve Stage 1, Res delete 2024 i5 M60 Cape York Green
	Appreciate 0 Quote

03-18-2023, 12:48 PM	#7
gasoline Private 36 Rep 92 Posts Drives: 530i Xdrive Join Date: Dec 2022 Location: Ankara iTrader: (0)	Hi, my vanos actuators were replaced today and finally the problem is solved!
	Appreciate 0 Quote