HOW TO: Clean MAF (Mass Air Flow sensor) - B15sentra.net - Nissan Sentra Forum
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Old 10-31-2004, 05:01 PM   #1
03BlkSpecV
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HOW TO: Clean MAF (Mass Air Flow sensor)

HOW TO: Clean MAF

I'm going to write a HOW TO per-se on how to clean the MAF (Mass Air Flow sensor). I've had mine go out on my twice. The first time the MAF caused my CEL to come on and my car went into Limp Mode. I brought it to the dealer and they replaced my MAF under warranty (this was at 12,000) with CAI.

At 27,000 miles my car would not rev past 4,500 rpms but the CEL did not come on. I took my MAF off and sprayed the crap out of it with CRC Air Intake Cleaner. It says on the back that it's sensor safe for 02 sensors and stuff. It costs between $2 and $3 at any autostore like Autozone. Someone told me not to get the kind with silicone in it. I don't know if the silicone is bad or not but I'd stick with just regular sensor safe air intake cleaner.

All I did was spray the screen a lot and the inside where the element is a lot. I let it air dry for a couple hours to make sure there was no moisture and then I reinstalled it. My car ran great.

I've cleaned my MAF in this same way with two seperate MAFs (I have two) 4 different times and the results have always been great. So, for all those who think you can ruin your MAF by spraying with CRC Air Intake Cleaner, you are wrong. This is a proven method and a way to clean it. I have done it four times and each time I have great results.

I just thought I'd share this info with you.
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Old 10-31-2004, 06:20 PM   #2
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Thanks for that info. Ive always wondered what I would use if I ever needed to clean my MAF. Maybe one of the mods on here could add this to the FAQ section.
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Old 11-01-2004, 02:26 PM   #3
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heh... im not touching my maf, just as soon as i do it will go bad!!
and i have no warranty but powertrain...
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Old 11-01-2004, 02:31 PM   #4
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Old 11-01-2004, 02:32 PM   #5
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I have also used regular parts cleaner with good results.
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Old 11-02-2004, 01:26 AM   #6
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BlkSpecV is on to something. Using a $3 can of carb cleaner to clean a dirty MAF is a cost effective option, if the only other choice is paying full price for a new one. But, be aware that there is a strong possiblity that you can damage a it beyond repair bye attempting to clean it. I'm a tech at a dealership, and we inform the customers that we can attempt to clean it to save them money; but worst case is it will need to be replaced if cleaning fails.
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Old 11-02-2004, 02:19 AM   #7
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carb cleaner is good to clean everything. i found carb cleaner is best even when cleaning injectors and manifolds. i would only find it necessary to try and attempt to clean it only if one of the problems arises. why take the chance at screwing up such a sensitive part
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Old 11-02-2004, 06:51 PM   #8
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hey thanks after the fact

i have had two MAFS go out on my and i didnt thinkl to clean them because someone told me that it was already ruined and thats all, no hope for that but i guess i will have some mafs too throw around if it works then thanks man
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Old 11-03-2004, 05:52 AM   #9
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I say clean them. I bet they're still good.

Shane
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Old 11-03-2004, 05:27 PM   #10
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**** it, already paid for my new MAF. $440 or so...I tried cleaning it before I bought it though, searched around and saw a bunch of people used q-tips and alcohol, tried no alcohol first, didn't change much if any. Tried the alcohol, ran like new for a few minutes then stalled. Wouldn't start back up, unplugged the MAF and reset ECU again and went to failsafe. Drove to dealership next morning...At least they sold me the MAF at 'warranty' pricing.
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Old 11-04-2004, 05:31 AM   #11
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Should have done it my way. Plus, I know a website where you can buy a MAF for about $45.00 shipped (used) but they work like new.

Shane
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Old 11-04-2004, 05:55 AM   #12
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to clean the maf properly you need to remove the sensor from the housing and use contact cleaner and a cue tip.
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Old 11-04-2004, 02:06 PM   #13
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For future reference (this is my 2nd MAF) where do they sell used MAFs?
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Old 11-04-2004, 02:13 PM   #14
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Originally Posted by chriserx
For future reference (this is my 2nd MAF) where do they sell used MAFs?
Scrap yards.....you should be able to find one there.

Up here in Canada, they are rare to find...damnit

Sell me your maf!!!
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Old 11-04-2004, 02:38 PM   #15
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Meant the site for used MAFs mentioned above, I'm planning on going to the dealership today to borrow the torx bit and pull the sensor out to see if I can't rebuild it. I love to play with electronics.
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