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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 04-09-2011, 10:13 AM
mrgbennett mrgbennett is offline
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MAF Cleaning Instructions

Hello to all....I have a 2000 E39 that I suspect needs a MAFS cleaning....can someone help me with the procedure. Thanks.
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  #2  
Old 04-09-2011, 06:30 PM
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Rustyzipper Rustyzipper is offline
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This what I do, and I'm sure you will get many other ways...

Once off take a large zip baggy, and fill it with a bottle of 92% alc. ( about a $1.50) the kind you find in the store drug section , its next to the rubbing Alcohol.

Put the MAF in the bag, zip it, and swish it around, for like 5 mins.. this cleans it good, inside and out.

Take it out and let it dry for 30 mins, if it is wet when you put it in... it will toast everything.

Thats it.. no need to buy any thing else.
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  #3  
Old 04-09-2011, 06:37 PM
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bluebee bluebee is offline
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From a quick /MAF(F3) in the best links thread ...

- Mass air flow sensor (MAF) and idle control valve (ICV) require periodic cleaning (1) (2) & buying a replacement MAF cheaper than the BMW MAF (RangeRover MAF) (VW MAF) (Hyundai MAF)
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  #4  
Old 04-10-2011, 07:22 AM
bimmernut1 bimmernut1 is offline
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I use CRC MAF cleaner. If you do a google search for it, there are several utube videos on how to clean the sensors. Some use the spray with a very gentle brush. Personally, I just use the spray and let it evaporate, no brush.

If after 1 or 2 cleanings, your MAF rate doesn't increase, I would replace the sensors. I consider them maintenance items anyway and replaced mine at 100k miles evern though they didn't exhibit any problem.

http://www.google.com/products/catal...d=0CDwQ8wIwAw#
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  #5  
Old 04-10-2011, 05:30 PM
NY_98_528i NY_98_528i is offline
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I am a believer! I just cleaned my MAF and there is a definite difference! I am still getting my cat checked tomorrow, but WOW, such a simple maintenance thing to do!
Quick step by step for a '98 528i
- remove the 2 10mm screws holding the airbox (you don't have to pull it out, this will allow
you the wiggle room you'll need later)
- use your flat head to loosen the band on the engine end of the MAF
- use your flathead to pop the 2 spring clips on either side of the MAF where it connects to
the airbox
- unscrew the wire harness, it has an externally rotating ring
- use your fingers to apply counter pressure to the MAF and you thumbs push on the
assembly that leads to the engine.
- pop out the MAF where it connects to the airbox and spray away with the CRC MAF cleaner
(5.99)
- Just note there is an O-ring seal insside the airbox that might get caught on the MAF as
you pull it out depending on how hard of an angle your working with.

The whole thing took me ten minutes!
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  #6  
Old 04-11-2011, 09:09 AM
mrgbennett mrgbennett is offline
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Thanks for the info everyone...great help....i cleaned and i did feel the difference...the ses light though is still on...should i clean the icv as well? Will this light turn it self off or do i have to bring it to a shop?
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  #7  
Old 04-11-2011, 09:22 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by mrgbennett View Post
the ses light though is still on...
How can anyone possibly troubleshoot properly without you telling us the codes that triggered the SES light?

Quote:
Originally Posted by mrgbennett View Post
Will this light turn it self off or do i have to bring it to a shop?
Oh my! I just realized you may not have read the codes yet. Is that the case?

If so, why not spend the $25 (at least that's how much it costs in the USA) to buy the code scanner and reset the light yourself?
- Cheapest CAN OBDII scanner on the net that reads DTCs, pending codes, & clears codes



Otherwise, you're just guessing (and, more importantly, wasting everyone's time, including yours!).
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  #8  
Old 04-11-2011, 11:05 AM
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Fudman Fudman is offline
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Just to clarify, for those who have not done so already, whenever you clean the MAF, DO NOT TOUCH IT (physically). Don't use a towel to wipe it dry or Q-tips to really get at the corners. Just let it air dry or you might damage the MAF.
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  #9  
Old 04-11-2011, 11:34 AM
Burning2nd Burning2nd is offline
Under the lift arms
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I just wanna hit this on the head once and done ,
Every Ase tech will tell you this is bad
Checking the voltage is how you test a maf, cleaning a maf is how you get to buy a new one
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  #10  
Old 04-11-2011, 01:02 PM
ChaseRobert ChaseRobert is offline
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+1 on CRC MAF cleaner (they have a video on their web site)
quadruple +1 on DON'T EVER TOUCH THE MAF ELEMENTS WITH ANYTHING.
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  #11  
Old 04-12-2011, 10:33 AM
mrgbennett mrgbennett is offline
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Purchasing code scanner right now...thanks....
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  #12  
Old 04-12-2011, 10:46 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by mrgbennett View Post
Purchasing code scanner right now...thanks....
Just for the record, I have the exact one pictured above, and, well, it works just fine for what I need it to do.

When/if I need fancier stuff ... I'll get a fancier scanner.

Be advised there is also freeware out there if you have a serial port Windows PC:
- OBD II PC freeware & $15 J1962 cable for the BMW E39
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  #13  
Old 04-12-2011, 11:14 AM
franka franka is offline
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Quote:
Originally Posted by Burning2nd View Post
Checking the voltage is how you test a maf, cleaning a maf is how you get to buy a new one
I want to clairify only. I have no position to take or defend.

Are you saying that cleaning the MAF, with a MAF spray, and w/o touching it, is NOT advised?
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  #14  
Old 04-12-2011, 11:31 AM
Burning2nd Burning2nd is offline
Under the lift arms
Location: Under the lift arms
 
Join Date: Aug 2010
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Mein Auto: E39 540, E36 328is, E83x3
Everything in the book says yes, don't touch it don't clean it

It's precision electronics, dropping it, disturbing the element inside anything like that is a no no ( from the shop side of business)
I'm sure many have done it but I'm sure there's a few,here who have done it and then replaced it afterwards....
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  #15  
Old 04-12-2011, 12:18 PM
franka franka is offline
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i have over 200k miles and have never touched it and never had a code on it.
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540/6

Dirrezas (4) @ 275/35-18, Eibach springs & bars, Bilstein Sports, Dinan Stage 2, slotted ATEs, Hi-Temp HTP pads, SS Lines, UUC-SS, White/Tan, Bling-free & Stealthy
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  #16  
Old 04-12-2011, 12:23 PM
Burning2nd Burning2nd is offline
Under the lift arms
Location: Under the lift arms
 
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Mein Auto: E39 540, E36 328is, E83x3
They really don't go bad when they do the voltage will be out of range and it will throw a voltage out of range code.... not to be confused with short to ground or open circuit

Sent from my ADR6300 using Bimmer App
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  #17  
Old 04-12-2011, 03:06 PM
DrewCrewOf2 DrewCrewOf2 is offline
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Anyone know of a good MAF on sale? My E39 is sometimes throwing odd mixture codes (Indie says) it may be the MAF causing this.
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  #18  
Old 09-10-2013, 06:01 PM
scpousnret scpousnret is offline
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"Once off.............
Thanks but I'm trying to get some simple but concise tips (and a video would be a plus),
on just how to access/remove it and the proper way to clean and put it back together.
Could you please provide the precise removal and cleaning procedures?

Much thanks in advance for your help.
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  #19  
Old 09-10-2013, 07:57 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by scpousnret View Post
please provide the precise removal and cleaning procedures?
Aren't the DIYs explicit?
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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #20  
Old 09-11-2013, 05:01 AM
scpousnret scpousnret is offline
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I guess I did not see the one you are referring to, I'll look again.
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