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Old 17th February 2004, 16:24   #1
pvapour
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MAF meter cleaning

Hi all

Think I might have a problem with my MAFs, done a search and read most posts but can't find anything relating to which part you actually clean, is it the: flat metal plate, the wire loop with a diode in the middle or the three little wires atatched to the metal plate?

Am I also right in thinking that the meters work by getting hot, then when the cool air flows over, they measure the amount of cooling and hence amount of air flow? as my car does seem to have more power when I first set out but as the engine warms the power slowly tails off, is this consitant with MAF sensor failure?

Cheers in advance for any help, waiting by.....

Nik
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Old 17th February 2004, 17:27   #2
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Re: MAF meter cleaning

To clean the MAFS, you need to remove the sensor section (whole black unit) from the cylinder and then stick it in a cup of diluted Simple green and water. Leave it there for about 10 minutes and then try to clean off the wire with a soft brush or something similiar. Hope this helps.
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Old 17th February 2004, 22:15   #3
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Re: MAF meter cleaning

Quote:
Originally Posted by TCM
To clean the MAFS, you need to remove the sensor section (whole black unit) from the cylinder and then stick it in a cup of diluted Simple green and water. Leave it there for about 10 minutes and then try to clean off the wire with a soft brush or something similiar. Hope this helps.
thanks TCM, will get onto it, have seen the pictorial step by step guide aswell now.

What about the symptoms I mention, is that consistant with MAF failure? is there a way of measuring if they're working correctly? by a main dealer or yourself?

Cheers, Nik
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Old 17th February 2004, 22:23   #4
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Re: MAF meter cleaning

Not so sure how the simple Green will affect the MAF... since the SG is a cleaner/degreaser, there might be a residue issue to contend with. I have seen (at Autozone, etc) sensor/ electronics cleaner... this might be closer to what you are looking for...

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Old 18th February 2004, 00:09   #5
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Re: MAF meter cleaning

I have used the Simple Green but would advise against it or at least, make sure you rinse it off completely...it can be corrosive from what I hear. I think that the spray electronics cleaner is a better solution. Just make sure that the one you get does not have any lubricant in it so there isn't any residue.
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Old 18th February 2004, 00:17   #6
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Re: MAF meter cleaning

Here's a very good guide!

MAF Cleaning.. DIY way

Cheers

Tin
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Old 18th February 2004, 01:06   #7
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Re: MAF meter cleaning

Good instructions but I suggest (1) using a non-residue electronics cleaner instead of Simple Green; and (2) using gummi phlege instead of Vaseline on the gaskets. Finally, recommend installing your IATS in the airbox while you have it out of the car!
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Old 18th February 2004, 02:17   #8
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Re: MAF meter cleaning

I've experienced the same problems as some folks here in various degrees the last months, during the last couple of days it completely stopped revving above ~4000rpm's. Luckily for me, some brilliant and informative minds on this forum had been creative, tested and described this solution in such a good way that i was able to both recognize and fix the problem.

BTW: When they run a diagnose thru OBDII on the car, it showed faulty lambda readings and a loong list of other problems. (with occurency over 160 times on some of them!)

So a HUUUUUGE thanks to those of you that saved me a lot off ($$$)!!


The work took me about 20min to complete, and the car works perfectly now, didn't even know the M5 could be as fast as my car is now....

If all car problems could be as easy as this.... !!

Again, THANKS!
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Old 18th February 2004, 03:19   #9
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Re: MAF meter cleaning

Two suggestions,

1) Use Electronics "Contact Cleaner" instead of Simple Green. I'll update the webpage someday. If you do use Simple green, dilute it and then be sure to clean/rinse with 99% alcohol. Simple Green is very alkaline, so don't use it on aluminum or it will etch.

2) If that doesn't fix it, try replacing your "Pre-Cat" O2 sensors before buying new MAFs. Much cheaper, and in my experience, more likely to be the problem.
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Old 18th February 2004, 08:12   #10
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Re: MAF meter cleaning

Thanks for the replies guys,

I have had the MAFs off the car now and cleaned them with a non lube contact cleaner only, just to be safe, to be honest they were not really that dirty but the surface area of the metal plate is quite pitted and not bright and shinny as some have said theirs are, these are the original MAFs on the 75k mile car (european). The car is still behaving the same, down on power when the engine is cold but even more down on power when the engine is hot?

Before changing the MAFs I shall look at the 'pre cat' O2 sensors (thanks Louv), but unsure where these are located for one, and two, is there a definitive test for these sensors to see if they're faulty, this question also applies to the MAFs, would a dealer be able to test the MAFs directly?

Cheers for all the information guys, much more help than I'm getting from anyone this side of the pond

Nik
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