Mustang Mass Air Flow (MAF). How do you know if its working or not? - Ford Mustang Forum

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post #1 of 2 (permalink) Old 02-17-2007 Thread Starter
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Question Mustang Mass Air Flow (MAF). How do you know if its working or not?

MAF how do you know if its working or not
I did not put this on but i am wandering how can you tell if it is working or not i dont fully understand maf if someone could link me to a thread or explain i would appreciate it

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post #2 of 2 (permalink) Old 02-17-2007
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MAF is Mass Air Flow. There is a meter ( the tube part that is after your air box or conical filter, which ever you have) They come is various sizes geared toward your engines performance. One popular size is 76mm , there is 90mm, 73mm etc.... Then there is the sensor (black plastic electronic device mounted to the MAF meter.
Basically this is your MAF system. Consists of MAF meter and MAF sensor.
There are two kinds of after market MAF systems
C&L (which I have) makes a MAF meter which has a sample tube in which you can change to match your injector size. You use your stock sensor with this meter.
Pro- M Granatelli Motorsports MAke a MAF Meter and sensor combo. Their sensor is electronically tuned to your injector size.
My sensor went bad, perhaps from cleaning is with o2 safe throttle body cleaner. Only clean your sensor very carefully with quick dry electronics cleaner or very very gently with alcohol and a swab. This information is directly from an A-1 certified mechanic. He said I ruined my sensor by using the throttle body cleaner.

Below is a post I read on AFM about HOW TO CHECK IF YOUR MAF SENSOR IS WORKING OR NOT ( it also tells how to check if your IAC is bad ,which is your idle air control)

I found this post and I found that my MAF sensor is bad. It started and idled no problem with the maf sensor unhooked.When I plugged it back in it died.
Please read it. It was so simple and it makes total sense.

Ya know, I just did a bunch of mods to my mustang, but it all started from changing out the intake manifold, upper and lower. Well mine would not idle too, I called ford and they told me to try two things.

Unplug the IAC (The tubular looking thing on the right side of the throttle body if your lokoing at it FROM the passenger side), with it unplugged try firing up the car, it should have an idle assuming the IAC is bad (so ford said). If that doesnt work, plug that back in and unplug the MAF sensor and try firing the car up. This is my problem. My car will not hold an idle, or even run, and has horrifying throttle response, and I discovered that with the MAF sensor plugged in, my car would crap I unplugged and sure enough the car had an idle. Very rough idle but it was running, and while it was idling I plugged the MAF sensor back in and bam, the car died on me. So i'm getting it replaced, hopefully that solves it. Try those two things, unplug your IAC and fire it up, if that doesnt work, plug it back in, then unplug the MAF Sensor and fire it up, that doesnt work, unplug them both and try it. Beyond that, I dont know. :-\ Maybe a vacuum leak? Anyways hope this helps.


Here are some links with pictures on MAF Systems

Hope this helps

1993 GT Mustang / Ford Racing GT-40 Crate Motor B-303 Cam / Tremec T-5Z / 4.30 Gears / Detroit Locker / Moser 31 Spline Axles/ Subframe Connectors / BMR Upper and Lower Control Arms / Lakewood Adjustable Drag Shocks/

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