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Old 02-17-2011
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Maf sensor?

I know it's called a mass air flow sensor but what exactly does it do and if it's dirty how would it affect my performance. I had one of those drop in k&n air filters and when I cleaned it. I think I put to much oil and it got on the Maf so on that note how can you clean these or would it be cheaper to buy a new one.
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Old 02-17-2011
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CLEAN! your sensor measures the amount of oxygen entering the intake. (just like your 02 measures the exhaust oxygen). when the MAF is sirty your ECU doesnt know how much gas to give you beacuse it cant find the right mixture due to the dirty MAF. They sell can to alcohol based aerosols at local auto store. I prefer CRC air intake cleaner..not MAF cleaner. mine is cheaper and for the same chemicals. you can clean it by either removing the housing off the airbox. its 4 bolts and disconnecting the air intake tube or if you have the right torx bit just unscrew the two screws holding the sensor in. when you do clean it keep the straw away from the wire. that wire is super fragile and if you snap it youll be dishing out 50 for a new sensor.
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Old 02-17-2011
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My MAF is held on by a strange screw, it looks like a star with a point in the middle? Any idea what the best way to remove it is as mine is due for a cleaning.
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Old 02-17-2011
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Quote:
Originally Posted by dracowing14 View Post
I know it's called a mass air flow sensor but what exactly does it do and if it's dirty how would it affect my performance. ....
Good reading here (clicky)
Long and short of it is that air/fuel ratios are calculated based on weights (mass), the MAF sensor works the front end of "how much air" your engine is drawing in -- Base tables work the efficiencies and other temperature sensors provide data for the expansion (reduction in mass-per-volume as the inbound air expands a bit). Injectors are controlled to flow a fixed rate (controlled by the time that the injector is open -- you may have seen injector ratings like 19lbs/hour...)

Read, then clean your MAF regularly (especially with an oiled air filter) with a good MAF cleaner spray

Quote:
Originally Posted by Marchy View Post
My MAF is held on by a strange screw, it looks like a star with a point in the middle? Any idea what the best way to remove it is as mine is due for a cleaning.
It's a security torx... not strange, just different
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Old 02-18-2011
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Quote:
Originally Posted by STUPIDHEAD11 View Post
your sensor measures the amount of oxygen entering the intake.
Air, not oxygen, otherwise it would be a MOS.
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Old 03-06-2011
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I too am trying to clean the MAF on my 98 4.0. Got a T-20 security torx bit however, only one screw will come off. The second it seems has 'extra' security in the form of some sort of filler in the hole of the srew that I cannot remove. Does anyone have any suggestions on how to remove this second screw?

Last edited by Quimby; 03-06-2011 at 03:55 AM. Reason: added engine type
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Old 03-06-2011
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Tap that torx bit with a small hammer. It will displace the debris.
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Old 03-06-2011
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Icon9

Thanks for the reply but
it is'nt actually debris, it appears to be some sort of hard plastic or epoxy from the factory. I tried popping it off with a pocket knife but it just popped the top off leaving the hole still filled.
I am a bit hesitant to tap on it with a hammer given the fragility of the filament wires inside that I want to clean. May try a small pair of vice grips as I am still at a loss.
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Old 03-07-2011
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From your description it sounds like someone has put some type of sealer around that screw. I probably would "not" hit it with hammer either. But if you're trying to clean off the filament wires, you could take off the air inlet hose before your MAF and just shoot some CRC cleaner in there toward the MAF sensor wires and clean them off.
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Old 03-08-2011
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Yes, you are right. I got a bit ahead of myself and was not thinking. I did exactly what you suggested, thanks. Could have saved myself some headache had I thought it through in the first place!
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Old 07-07-2011
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My MAF sensor has the same type of black looking epoxy on it also. I haven't actually had a chance to clean it since i didn't have the T20 torx. (It was at work). I am having problems with rough idling and sputtering. I cleaned the TB and the IAC yesterday. That didn't seem to help any but it needed to be done. While the truck was still idling rough and revving up and down in rpms i unplugged the MAF sensor and the truck came to a very smooth idle (smoother than i have ever seem since I've owned it), it idled like this for about 5 minutes then just cut off. Is my MAF sensor bad or is it something else? I plan on cleaning the MAF today but if its bad then i wont bother and I'll just get a new one. Any suggestions would be great.
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