What does the sensor in the airbox do?

[J.Davy]

I am curious what it controls ?Does it have to have a certain amount of vaccum before it goes to full fuel?If you change your intake do you have to hook it up in the air flow or can you just plug the module outside and let it hang?

 

[TCDiesel]

I am curious what it controls ?Does it have to have a certain amount of vaccum before it goes to full fuel?If you change your intake do you have to hook it up in the air flow or can you just plug the module outside and let it hang?

(MAF) Mass air flow, The ECM will use this sensor for various operations,Fan engagement,air temp,flow. NO you will set a code ,it cannot be bypass,placement is important.

 

[nickleinonen]

If you change your intake do you have to hook it up in the air flow or can you just plug the module outside and let it hang?

take your pick... both will work... as long as you keep the sensor plugged in... it is a temprature and pressure sensor... it measured the intake air temp and atmospheric pressure... if it is in the intake tract, it will read a little lower pressure than if you leave it outside hanging [filter restriction and venturi vacuum effect on the sensor], and the tempratures will read close to the same between. .



i have had it both ways with my bhaf piping [it is now in the piping] and i noticed no difference in drive feel between the locations...

 

[Matt400]

it is a temprature and pressure sensor... it measured the intake air temp and atmospheric pressure...

I wonder if anyone has tried fooling the pressure circuit to simulate sea level in hopes of a gain in timing and fueling at other elevations??

 

[rbattelle]

I wonder if anyone has tried fooling the pressure circuit to simulate sea level in hopes of a gain in timing and fueling at other elevations??

I would think that would make lots of smoke at altitude.



-Ryan

 

[nickleinonen]

I would think that would make lots of smoke at altitude.



-Ryan

only until turbo spooled... but don't most here for some reason want massive amounts of smoke???



i don't think it would be too hard to fool... make a plastic globe thing with a fitting for the sensor, a fitting for a shrader [sp?] valve and an 1/8" npt fitting to attach a vacuum gauge to... drop the pressure in the globe to below atmospheric and you are good... but it would need to vary as at idle the map sensor reads pretty much the same pressure as the iat... both would read atmospheric [±14. 7 sea level]



heck, it would be easy to test to see if it would set a code, remove the sensor and attach a long plastic tube to it [make sure it can handle vacuum] run it to the cab and suck on it while driving... you can easially draw 10"hg with your mouth

 

[rbattelle]

run it to the cab and suck on it while driving... you can easially draw 10"hg with your mouth

:-laf

Imagine trying to explain that to a cop. Or anyone else, for that matter.

:-laf



-Ryan

 

[TCDiesel]

If placement is close to a heat source your fan will engage at most start ups.

 

[Matt400]

:-laf

Imagine trying to explain that to a cop. Or anyone else, for that matter.

:-laf

:-laf But sir. . my trucks performance seems to improve the harder I suck! :-laf :-laf



Wait a minute. . at sea level there is more pressure so you would have to blow your truck... er I mean the tube to test right?, might be just as hard to explain though :-laf :-laf

 

[Tony T.]

Sounds like a 12v compressor or vacumn would be in order for such emergencys.



Tony