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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 06-07-2006, 01:34 PM   #1
B1MM3R
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Question How to clean MAF - NEED HELP!!

I did a search but wasn't able to find a DIY on cleaning the MAF. I've heard that cleaning it makes a world of a difference in older Ms so want to give it a try.

More detailed the better and pics would be great. Thanks in advance !
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Old 06-07-2006, 01:40 PM   #2
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I did a search but wasn't able to find a DIY on cleaning the MAF. I've heard that cleaning it makes a world of a difference in older Ms so want to give it a try.

More detailed the better and pics would be great. Thanks in advance !

http://www.louv.tv/cars/m5/MAF/
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Old 06-07-2006, 03:50 PM   #3
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Some people shy away from using q-tips on the sensor and instead prefer using electrical contact cleaner. Make sure that it is "plastic safe". It dries almost instantly and leaves no residue. Just make sure that the force of the spray doesn't damage the sensor wires, by keeping it at a safe distance. (6 - 8" or so)

http://www.crcindustries.com/catalog...sers/02016.jpg
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Old 06-08-2006, 03:07 AM   #4
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All you got to do is this http://www.crcindustries.com/files/M...0FINAL%202.pdf and spary the crap out of it then let it dry. I have done cleaning AFM with this many times.

http://www.shop.com/op/aprod-p357627...ver?sourceid=3
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Old 06-08-2006, 06:46 AM   #5
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Quote:
Originally Posted by B1MM3R
I did a search but wasn't able to find a DIY on cleaning the MAF. I've heard that cleaning it makes a world of a difference in older Ms so want to give it a try.

More detailed the better and pics would be great. Thanks in advance !
If it's not giving you problems then I honestly would just leave it alone. Not worth possibly damaging it.

Jared
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Old 06-08-2006, 09:58 AM   #6
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Originally Posted by 332ic
All you got to do is this http://www.crcindustries.com/files/M...0FINAL%202.pdf and spary the crap out of it then let it dry. I have done cleaning AFM with this many times.

http://www.shop.com/op/aprod-p357627...ver?sourceid=3
So do I spray the sensor itself (the one pictured below)

and the mesh end (pictured below)?


Or is it just one or the other? I'm not sure which part needs the cleaning. And the only thing I need is the CRC Mass Air Flow Sensor Cleaner and let it air dry after spraying? No wiping or cleaning? Just spray?

Also, is it really necessary to lubricate it as it says in the DIY? Thanks !
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Old 06-08-2006, 08:11 PM   #7
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Look at the picture that says: "Gently swab sensors with Q-Tips"
This is where you want to spray. No swabbing required. Less risk of damaging the wires.
The CRC product will dry almost instantly and leave no residue.
Spray it a couple of times, and from different angles.
Follow the air flow path, then go against the air flow path.


You can spray the "mesh" with the CRC product, or you can clean that part as indicated. The mesh isn't an expensive and fragile component. The sensor is! If you want, you can skip cleaning the mesh part.

The vaseline is probably used for a couple of reasons... to assist in reassembly and sealing. I'd follow the directions, just use it sparingly.
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Old 06-09-2006, 09:32 AM   #8
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Thanks! I'll try it out this weekend.
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Old 08-17-2006, 12:10 PM   #9
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Sorry to bring this one back to life...but where can I buy this CRC cleaner???
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Old 08-17-2006, 12:22 PM   #10
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Sorry to bring this one back to life...but where can I buy this CRC cleaner???
Pep Boys
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Old 08-17-2006, 01:43 PM   #11
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Thank you.
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Old 01-27-2007, 05:36 PM   #12
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Just cleaned my MAF sensor with the dedicated spray only (no q tips). Haven't really driven around to see if there is any difference. Has anyone noticed a difference with cleaning?
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Old 01-27-2007, 07:55 PM   #13
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Shizit! While I was inside my wife got in the car to move it. I hadn't hooked the MAF back up again. The service engine soon light obviously came on. I hooked it up and the light is still on. Will SES light auto reset after a little driving or do I need to get it reset?
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Old 01-28-2007, 06:29 AM   #14
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Make sure you use a cleaner that doesn't contain a lubricant as that will leave a residue behind.
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Old 01-28-2007, 01:42 PM   #15
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Shizit! While I was inside my wife got in the car to move it. I hadn't hooked the MAF back up again. The service engine soon light obviously came on. I hooked it up and the light is still on. Will SES light auto reset after a little driving or do I need to get it reset?

Should go away after a few key cycles. Could try pulling the fuse for the engine control module or disconnecting the battery too.
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Old 01-29-2007, 10:42 AM   #16
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Yep, it went away on it's own.

The car does seem to be running better in subtle way. I drove around the olympic mountains yesterday and I got 2 more miles per gallon than I usually average. Anecdotal evidence at best but cleaning the MAF sensor is a quick and easy thing to do.
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Old 02-17-2007, 10:41 AM   #17
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I cleaned my Maf today with the crc maf cleaning spray, and I cant say I feel any difference from before. But at least its clean as a babys bottom now=)

The fuelfilter swap I did yesterday did=))
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Old 02-18-2007, 09:24 PM   #18
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I cleaned my Maf today with the crc maf cleaning spray, and I cant say I feel any difference from before. But at least its clean as a babys bottom now=)

The fuelfilter swap I did yesterday did=))
ditto. Noticed no change, but at least I know my stuff is clean.
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Old 04-01-2008, 09:55 AM   #19
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Can you remove that plastic mesh screen for more improved air flow? Or does it hurt the MAF if you do that?
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Old 04-02-2008, 11:10 PM   #20
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^ it hurts the maf and your performance..
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