MAF Sensor
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Junior User
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MAF Sensor
Hi, first time posting here as you can see. 
Have a question about the MAF sensor. Do I have one? 1995 Bronco 351.
Trying to install a K&N Cold air and noticed that I could choose form 2 of them. With MAF and Without MAF.
Wondering where it is located if I even have one.
Thanks!
Have a question about the MAF sensor. Do I have one? 1995 Bronco 351.
Trying to install a K&N Cold air and noticed that I could choose form 2 of them. With MAF and Without MAF.
Wondering where it is located if I even have one.
Thanks!
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
probably not but you might be one of the very few lucky ones. only CA broncos/F150s running that engine combo for that year had mass air due to smog regs.
easiest way to tell is there would be a sensor mounted to the air box.
if you have 2 individual tubes running from the throttle body to the air box then you have speed density NOT mass air.
Ford Fuel Injection has great efi related info. read up.
easiest way to tell is there would be a sensor mounted to the air box.
if you have 2 individual tubes running from the throttle body to the air box then you have speed density NOT mass air.
Ford Fuel Injection has great efi related info. read up.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Oiled K&N filters are not recommended as they can contaminate the MAF sensor, and any open air filter will draw in hot air from the engine bay instead of the relatively cold outside air the stock system provides. These open filters can also disrupt airflow through the MAF sensor and result in loss of milage and worse performance. In general a dry drop in filter is the better option, and if you feel you need some extra performance from your intake system you can swap in an intake snorkle from an I6 or 460 truck, that's the part that goes from the rad support to the bottom of the airbox. For some reason trucks with thse motors got a different snorkle that is a little better design.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Yes, oil impregnated air filters damage MAF sensors due to the atomization of the oil in the air as it is carried through the intake plumbing. MAF sensors utilize a heating element wire to determine air flow.
If you think about what happens if you blow air down into your toaster while its on you realize that the heating element wires will darken (cool off) when you do. The MAF sensor uses this effect to determine how much air is flowing into the engine. To maintain a given temperature the element wire needs "x" amount of voltage to maintain that temperature. As air flows across the element wire it cools. The computer then increases the voltage so as to maintain the correct temperature. The amount of voltage required to maintain the proper temperature gives the computer a reference point to determine how much air is flowing into the engine.
If you then start getting tiny oil drops on the MAF sensor wire (because lets face it air passing through an oil-impregnated filter is going to carry some of it away), the wire is going to "bake" the oil onto itself and cause the efficiency of the sensor to diminish and prematurely fail.
If you think about what happens if you blow air down into your toaster while its on you realize that the heating element wires will darken (cool off) when you do. The MAF sensor uses this effect to determine how much air is flowing into the engine. To maintain a given temperature the element wire needs "x" amount of voltage to maintain that temperature. As air flows across the element wire it cools. The computer then increases the voltage so as to maintain the correct temperature. The amount of voltage required to maintain the proper temperature gives the computer a reference point to determine how much air is flowing into the engine.
If you then start getting tiny oil drops on the MAF sensor wire (because lets face it air passing through an oil-impregnated filter is going to carry some of it away), the wire is going to "bake" the oil onto itself and cause the efficiency of the sensor to diminish and prematurely fail.
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Junior User
Joined: Mar 2010
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thanks
nice to know how a maf sensor works. went and looked and i dont have one. so thats a good thing.
i ended up not going with a CIA, but rather just a drop in K&N. did that to my 90 bronco and it helped.
nice to know how a maf sensor works. went and looked and i dont have one. so thats a good thing.
i ended up not going with a CIA, but rather just a drop in K&N. did that to my 90 bronco and it helped.
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Hotshot
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Oiled K&N filters are not recommended as they can contaminate the MAF sensor, and any open air filter will draw in hot air from the engine bay instead of the relatively cold outside air the stock system provides. These open filters can also disrupt airflow through the MAF sensor and result in loss of milage and worse performance. In general a dry drop in filter is the better option, and if you feel you need some extra performance from your intake system you can swap in an intake snorkle from an I6 or 460 truck, that's the part that goes from the rad support to the bottom of the airbox. For some reason trucks with thse motors got a different snorkle that is a little better design.
I'm running the stock air box and filter with the I6/460 tube. It works great.
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