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MOPAULY
06-25-2012, 04:14 PM
Cleaned it yesterday; noticeable improvement with low rpm response and off idle smoothness in acceleration.

Open hood

Remove plastic cover protecting MAF harness

Remove 2x torx screws for MAF

unplug MAF harness

Hold over paper towel on workbench, spray with MAF cleaner

Use q-tip or MAF cleaner soaked paper towel to gently clean exposed wire sensor

Reinstall

Enjoy

DFEL750I
06-25-2012, 10:50 PM
Cleaned it yesterday; noticeable improvement with low rpm response and off idle smoothness in acceleration.

Open hood

Remove plastic cover protecting MAF harness

Remove 2x torq screws for MAF

unplug MAF harness

Hold over paper towel on workbench, spray with MAF cleaner

Use q-tip or MAF cleaner soaked paper towel to gently clean exposed wire sensor

Reinstall

Enjoy

+1 I noticed improvements when I cleaned mine as well. Instructions above are for the facelift MAF. Prefacelift would be different.

Emeer18
06-25-2012, 11:28 PM
I've been wanting to do this. I got a check engine code that says bank 1 sensor 2 02 sensor failure due to failed MAF. But im getting no MAF code saying its not working. What type of cleaner did you use?

MOPAULY
06-26-2012, 04:49 AM
I don't recall the brand but the chemicals in the cleaner are specific to the makeup of these sensors...however any auto parts store should carry it on the shelf, it's literally labeled MAF sensor/cleaner right on the can.

collins912
06-26-2012, 06:05 AM
I just cleaned mine about 2 days ago and just as u said....very noticeable!

08750i
06-26-2012, 07:47 AM
Ok, what is a MAF? And where do I find it on my 2008 750i?

Emeer18
06-26-2012, 08:00 AM
Ok, what is a MAF? And where do I find it on my 2008 750i?

Mass Air Flow Sensor. MAF's are always after the airfilter and before the air intake.

dgoodsell
06-26-2012, 08:05 AM
This has become part of my routine maintenance do about every 3 mos or so.

08750i
06-26-2012, 08:08 AM
Mass Air Flow Sensor. MAF's are always after the airfilter and before the air intake.

Thank you!

1bad540
06-26-2012, 10:12 AM
Hmm I'll give it a shot.:thumbup:

DFEL750I
06-26-2012, 11:30 AM
I actually have two MAFs. I bought one when I was troubleshooting an issue and never bothered to try to sell it. So I just switch them around :) . I also have an extra throttle body. If I was smart I would sell them. Can probably get $400-500 for both.

dgoodsell
06-26-2012, 11:42 AM
I actually have two MAFs. I bought one when I was troubleshooting an issue and never bothered to try to sell it. So I just switch them around :) . I also have an extra throttle body. If I was smart I would sell them. Can probably get $400-500 for both.

Im in the same boat bought a spare MAF when I was troubleshooting so issues and never got around to selling it.

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jiceoo
06-26-2012, 05:09 PM
hmm i'll give it a shot.:thumbup:

+1

Rookie2008
06-26-2012, 07:30 PM
+2 Thanks

7Fif
06-26-2012, 07:59 PM
Pics Please or is it easy to find. Would like to try as well

II Kings 9:20
06-26-2012, 08:57 PM
Nice, at what miles? Mine is running fine at 50K or so I think. Brother just took his Yukon to Autozone and the CEL code came up MAF and they recommended the exact same procedure with the cleaner.

iceman5
06-26-2012, 09:40 PM
Heres an older thread with some pictures

http://www.bimmerfest.com/forums/showthread.php?t=599668&highlight=maf

02QTR28
06-27-2012, 02:45 PM
Anybody have DIY video I want to try it but need to exactly know & what not to touch?!

iceman5
06-27-2012, 03:52 PM
Ok guys heres my attempt at a DIY.

Attached in the photo you will find the MAF (Mass Air Flow Sensor). To remove it there are two torx screws, one on top and one on the bottom.

Remove screws and pull out the MAF. There is a plastic covering that needs to be removed which is just held by clips, be careful removing them as they are easy to break.

Disconnect MAF by gently pushing on the release, do not apply any force, youll see the release right by the connector.

Make sure you let the MAF cool down, or better yet do it on a cold engine, because if you try cleaning it while it is still hot you can fry it.

Next step get some MAF Cleaner from Autozone or PepBoys, you can use other electric cleaners, but why when there is one designed specifically for this.

Take the can of MAF cleaner and spray all over the MAF up until the rubber gasket, make sure to not spray on the connector.

Take a que tip, and very CAREFULLY clean along the metal piece of the sensor.

After you are done give it some time to dry and reinstall. On the can of MAF cleaner it says dries instantly, but you really should give it at least 10-15 minutes to dry to be safe.

Hope this helps guys, good luck and let me know how it works out!

Heres a quick recap

iceman5
06-27-2012, 03:54 PM
http://www.bimmerfest.com/forums/attachment.php?attachmentid=311587&d=1328756756
http://www.bimmerfest.com/forums/attachment.php?attachmentid=311588&d=1328757268

Thesatman
09-04-2013, 07:44 AM
+1. They should really sell a smaller bottle of MAF cleaner though. I have enough to clean this thing 100 times.

roadfrog
09-04-2013, 08:01 AM
You can use the MAF senor cleaner for other things such as an electrical contact cleaner or even for the throttle body.

Thesatman
09-04-2013, 11:45 AM
You can use the MAF senor cleaner for other things such as an electrical contact cleaner or even for the throttle body.

Yeah, I thought of that too. It appears to be mostly compressed alcohol solution.

msiedliski
01-28-2014, 10:57 PM
:thumbup:I just cleaned the MAF, after changing the spark plugs with laser NGK's and both filters.
The car did not start first time, the computers where adjusting.Second time started great and the RPM went up and down then evened out. The engine was running VERY SMOOTH. I will be driving My 2007 750Li BMW in the am in the AM.
Hope it will run smooth and efficient. The picks helped, Thank You.
I sprayed a lot of the MAF cleaner, and gently used a q-tip to clean the small wire in the pick:):thumbup:
:)

mgucci745
03-01-2014, 12:19 PM
Is the MAF in the same place on the Pre Face Lift ?

First_745Li
03-01-2014, 01:15 PM
Is the MAF in the same place on the Pre Face Lift ?


Right on top by the air box IIRC.


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PRBMW7ser05
03-02-2014, 10:18 AM
I'm in. I'll give it a try. Thanks guys.