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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old July 11th, 2001, 13:15   #1
slick1305
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Join Date: May 2001
Location: chesapeake, va
Default What does MAF stand for?

I keep hearing about it and im not sure what it stands for. IM guessing something that has to do with air flow. Also where is the MAF locatd on the car and how to check it if it needs to be cleaned.
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Old July 11th, 2001, 14:17   #2
OilBurnerBob
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Default Re: What does MAF stand for?

Mass Air Flow. Located in the intake beyond the air filter and before the EGR. [img]images/icons/grin.gif[/img]
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Old July 11th, 2001, 14:23   #3
Dieter
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Location: Between TX and KS
Default Re: What does MAF stand for?

And what exactly does it do? Calculate the volume of air the engine is sucking so the computer can adjust the fuel flow?
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Old July 11th, 2001, 17:29   #4
MOGolf
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Default Re: What does MAF stand for?

The sensor works on the principle that the resistance of an electrical wire will vary according to its temperature.

The air going through the sensor cools the wire thus changing its resistance. Combined with air temperature reading (from the intake air temperature sensor), the ECU/ECM (the brains running your car) calculates the density of air entering the engine. Taking into account the known given volume of air that can pass through the MAF at a given temp, it knows the actual quanity of air going in.
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