F30 328i Intake Issue

ACR3597 · 02-09-2017, 11:08 AM

Recently I purchased and installed the AWE Carbon Fiber air intake but also have the AWE cat back exhaust, downpipe, and JB4 on my car. When in sport mode and I do a hard acceleration my car usually does a backfire/burble noise when shifting gears. When I first got the intake installed and I'd do a sort of hard acceleration my car would make the backfire noise when shifting and would shift smoothly like normal. The next day though when I accelerate the car would make a weird backfire noise and it would sort of stutter when shifting. Additionally it seems the throttle response doesn't seem as good as it was before and seems like the car holds gears longer than usual.

Overall my car just doesn't seem to be running the same even though it seemed completely fine at first.

Any advice?

mbanks21 · 02-09-2017, 11:16 AM

Unplug your MAF sensor and try again.

ACR3597 · 02-09-2017, 11:20 AM

Quote:

Originally Posted by mbanks21

Unplug your MAF sensor and try again.

Keep it unplugged or just unplug and plug it back in?

mbanks21 · 02-09-2017, 11:48 AM

Keep it unplugged

ACR3597 · 02-09-2017, 01:56 PM

Quote:

Originally Posted by mbanks21

Keep it unplugged

Could unplugging the MAF wire potentially cause something on the car to go awry?

ACR3597 · 02-09-2017, 01:57 PM

Quote:

Originally Posted by mbanks21

Keep it unplugged

Could unplugging the MAF wire potentially cause something on the car to go awry?

mbanks21 · 02-09-2017, 02:03 PM

Quote:

Originally Posted by ACR3597

Could unplugging the MAF wire potentially cause something on the car to go awry?

Not according to Terry at BMS and multiple other people "in the know". I had the same issue with mine and my MAF sensor has been unplugged for around 3 months now, no issues yet.

ACR3597 · 02-09-2017, 03:04 PM

Quote:

Originally Posted by mbanks21

Quote:

Originally Posted by ACR3597

Could unplugging the MAF wire potentially cause something on the car to go awry?

Not according to Terry at BMS and multiple other people "in the know". I had the same issue with mine and my MAF sensor has been unplugged for around 3 months now, no issues yet.

So it's a known issue pretty much that the MAF doesn't work correctly when there's a JB4 involved? Also did any CEL come on or do I have to plug my computer into the JB4 to change some of the settings?

I appreciate your help so far!

mike@x-ph.com · 02-09-2017, 03:48 PM

Quote:

Originally Posted by ACR3597

So it's a known issue pretty much that the MAF doesn't work correctly when there's a JB4 involved? Also did any CEL come on or do I have to plug my computer into the JB4 to change some of the settings?

I appreciate your help so far!

Issue is not caused by the JB4 ... It is caused by the aftermarket intake
Jb4 fixes it

ACR3597 · 02-09-2017, 04:19 PM

Quote:

Originally Posted by mike@x-ph.com

Quote:

Originally Posted by ACR3597

So it's a known issue pretty much that the MAF doesn't work correctly when there's a JB4 involved? Also did any CEL come on or do I have to plug my computer into the JB4 to change some of the settings?

I appreciate your help so far!

Issue is not caused by the JB4 ... It is caused by the aftermarket intake
Jb4 fixes it

So unplugging the MAF plug will allow the JB4 to make the intake work correctly

ACR3597 · 02-09-2017, 07:40 PM

Well I unplugged the sensor kept unplugged and took it for a ride. The difference was immediately noticeable. The throttle felt lighter, the car didn't hold the shifts longer, the sounds sounded better, and I think it's faster now and sounds better. Overall I believe it's back to normal if not better. Hopefully within the next few days to weeks it'll still be running fine and no issues will arise.

Thanks to both of you guys I appreciate it!

mbanks21 · 02-09-2017, 07:59 PM

Congrats. Spread the word. Down with MAF!

GodZhu · 02-12-2017, 07:52 PM

Sorry to seem like a stupid kid, but how could I take out of the MAF sensor?

mbanks21 · 02-13-2017, 06:32 AM

Quote:

Originally Posted by GodZhu

Sorry to seem like a stupid kid, but how could I take out of the MAF sensor?

It just unplugs (get a little screwdriver and carefully lift the clip)

Chris@codemybimmer · 02-13-2017, 09:32 AM

is unplugging the MAF only for people who have aftermarket intakes?
I got Jb4 with stock intake at the moment.

mbanks21 · 02-13-2017, 10:45 AM

Quote:

Originally Posted by 1lyfe

is unplugging the MAF only for people who have aftermarket intakes?
I got Jb4 with stock intake at the moment.

Yes

ACR3597 · 02-20-2017, 08:51 PM

Quote:

Originally Posted by GodZhu

Sorry to seem like a stupid kid, but how could I take out of the MAF sensor?

Well you're not taking the whole MAF sensor out you're just unplugging the wire that connects to the sensor

madmortar · 02-21-2017, 01:46 PM

Sorry but this just sounds really lame...
In order to get a tune and an intake to work together...lets all suggest to unplug the MAF even though there is no logic, data, and even the aftermarket companies behind this "solution"???

Seems like the combo is causing an issue and unplugging the MAF is, in my mind, the equivalent to cutting your springs so you get a drop. Easy fix but you have no idea what other issues it will cause down the line. Plus it sounds ghetto.

Sorry, not trying to be rude haha.

D041987 · 02-21-2017, 02:28 PM

MAF is not really needed as our manifold runs on Intake pressure to calculate the right amount of fuel hence why we have a MAP sensor and is much more accurate. The MAF is a supplementary to the MAP. Both are not needed and in most cases many other makes and people who tune cars delete the MAF and run MAP for more accurate scaling.

madmortar · 02-21-2017, 02:36 PM

Quote:

Originally Posted by D041987

MAF is not really needed as our manifold runs on Intake pressure to calculate the right amount of fuel hence why we have a MAP sensor and is much more accurate. The MAF is a supplementary to the MAP. Both are not needed and in most cases many other makes and people who tune cars delete the MAF and run MAP for more accurate scaling.

I've heard about that when running a larger aftermarket turbo and a tune specifically made for a non-MAF set up. But for stock turbo, JB4 and an intake? Seems silly.

You would think after spending a grand on an intake you wouldnt have to have any guess work on, should I go maf-less or not just because you have a tune.

Again, maybe im off base....but seems like alot of guessing and nothing guaranteed...which is a shame for all the money the OP spent on the tune and intake. If the intake works fine on OEM tune...and Jb4 is causing it problems, would say JB4 is the issue and they need to address what should be done to run their tune with an aftermarket intake. If they say "remove the MAF" and that becomes SOP...then I guess it is what it is..

jkwhar · 02-24-2017, 08:22 AM

Quote:

Originally Posted by mbanks21

Yes

What about users with aftermarket intake and no tune? unplug the MAF as well?

mbanks21 · 02-24-2017, 08:32 AM

Quote:

Originally Posted by jkwhar

What about users with aftermarket intake and no tune? unplug the MAF as well?

I'd only do that if you're having similar issues to the OP. Couldn't hurt to unplug it and see.

02-09-2017, 11:08 AM	#1
ACR3597 Second Lieutenant 50 Rep 208 Posts Drives: 2013 BMW 328i MSport Join Date: Aug 2015 Location: USA iTrader: (0)	Recently I purchased and installed the AWE Carbon Fiber air intake but also have the AWE cat back exhaust, downpipe, and JB4 on my car. When in sport mode and I do a hard acceleration my car usually does a backfire/burble noise when shifting gears. When I first got the intake installed and I'd do a sort of hard acceleration my car would make the backfire noise when shifting and would shift smoothly like normal. The next day though when I accelerate the car would make a weird backfire noise and it would sort of stutter when shifting. Additionally it seems the throttle response doesn't seem as good as it was before and seems like the car holds gears longer than usual. Overall my car just doesn't seem to be running the same even though it seemed completely fine at first. Any advice?
	Appreciate 0 Tweet Quote

02-09-2017, 11:16 AM	#2
mbanks21 Colonel 1268 Rep 2,957 Posts Drives: 2015 335i MSport Join Date: Aug 2013 Location: High Bridge, NJ iTrader: (8)	Unplug your MAF sensor and try again.
	Appreciate 1 ACR359750.00 Quote

02-09-2017, 11:48 AM	#4
mbanks21 Colonel 1268 Rep 2,957 Posts Drives: 2015 335i MSport Join Date: Aug 2013 Location: High Bridge, NJ iTrader: (8)	Keep it unplugged
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02-09-2017, 07:40 PM	#11
ACR3597 Second Lieutenant 50 Rep 208 Posts Drives: 2013 BMW 328i MSport Join Date: Aug 2015 Location: USA iTrader: (0)	Well I unplugged the sensor kept unplugged and took it for a ride. The difference was immediately noticeable. The throttle felt lighter, the car didn't hold the shifts longer, the sounds sounded better, and I think it's faster now and sounds better. Overall I believe it's back to normal if not better. Hopefully within the next few days to weeks it'll still be running fine and no issues will arise. Thanks to both of you guys I appreciate it!
	Appreciate 1 mbanks211267.50 Quote

02-09-2017, 07:59 PM	#12
mbanks21 Colonel 1268 Rep 2,957 Posts Drives: 2015 335i MSport Join Date: Aug 2013 Location: High Bridge, NJ iTrader: (8)	Congrats. Spread the word. Down with MAF! __________________ 2015 335i Msport/6 JB4/EWG/E30/VRSF DP/ER CP/ VRSF Race Exhaust/ Injen Intake/Verde Axis 19x8.5/9.5 245/35/275/30 Conti Extreme CS/ H&R Sports / Motorsport Hardware Stud Conversion
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02-12-2017, 07:52 PM	#13
GodZhu Private First Class 36 Rep 117 Posts Drives: 2014 335i xDrive M-Sport Join Date: Dec 2015 Location: Vancouver, B.C iTrader: (0)	Sorry to seem like a stupid kid, but how could I take out of the MAF sensor?
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02-13-2017, 09:32 AM	#15
Chris@codemybimmer BimmerPost Supporting Vendor 171 Rep 1,397 Posts Drives: AW F30 328i Xdrive Join Date: Jan 2012 Location: Toronto iTrader: (1)	is unplugging the MAF only for people who have aftermarket intakes? I got Jb4 with stock intake at the moment.
	Appreciate 0 Quote

02-21-2017, 01:46 PM	#18
madmortar Captain 181 Rep 785 Posts Drives: 2013 BMW 328i M-Sport Join Date: Aug 2016 Location: Savannah, GA iTrader: (0)	Sorry but this just sounds really lame... In order to get a tune and an intake to work together...lets all suggest to unplug the MAF even though there is no logic, data, and even the aftermarket companies behind this "solution"??? Seems like the combo is causing an issue and unplugging the MAF is, in my mind, the equivalent to cutting your springs so you get a drop. Easy fix but you have no idea what other issues it will cause down the line. Plus it sounds ghetto. Sorry, not trying to be rude haha.
	Appreciate 1 CalCarNut1060.50 Quote

02-21-2017, 02:28 PM	#19
D041987 Big Turbo Boys N Girls 327 Rep 579 Posts Drives: 2012 328I 6speed Join Date: Apr 2016 Location: Lynnwood, WA iTrader: (0)	MAF is not really needed as our manifold runs on Intake pressure to calculate the right amount of fuel hence why we have a MAP sensor and is much more accurate. The MAF is a supplementary to the MAP. Both are not needed and in most cases many other makes and people who tune cars delete the MAF and run MAP for more accurate scaling.
	Appreciate 1 mbanks211267.50 Quote