OMG MY K&N FILTER!!!

[ChinoCharles]

Pop quiz: What element of the Yaris's MAF could POSSIBLY get dirty enough to cause issues?

A: The mirror!

Yarii have a Karman Vortex-style MAF. It works via a mirror located in the stalk of the sensor. Air is redirected up the stalk and against a tiny little mirror, and the oscillations of that mirror are measured via a photoreceiver that receives LED light that is reflected off the mirror.

SO, you guys are telling me that oil from a filter is going to make it all the way up the stalk of the MAF, contaminate it, and then the filter is going to let in enough dirt (which is also magically going to take a trip up the stalk of the sensor) and ruin it, too?

No, it won't. That is why Toyota uses these MAF's and have for decades. They are reliable. That is to say nothing of the fact that properly installed oiled filters do nothing to air flow sensors in the first place.

You guys are arguing urban legend. It comes up here about once a year, and it gets shot down every single time.

[1stToyota]

Originally Posted by ChinoCharles

Pop quiz: What element of the Yaris's MAF could POSSIBLY get dirty enough to cause issues?

A: The mirror!

Yarii have a Karman Vortex-style MAF. It works via a mirror located in the stalk of the sensor. Air is redirected up the stalk and against a tiny little mirror, and the oscillations of that mirror are measured via a photoreceiver that receives LED light that is reflected off the mirror.

SO, you guys are telling me that oil from a filter is going to make it all the way up the stalk of the MAF, contaminate it, and then the filter is going to let in enough dirt (which is also magically going to take a trip up the stalk of the sensor) and ruin it, too?

No, it won't. That is why Toyota uses these MAF's and have for decades. They are reliable. That is to say nothing of the fact that properly installed oiled filters do nothing to air flow sensors in the first place.

You guys are arguing urban legend. It comes up here about once a year, and it gets shot down every single time.

Thanks. I'll look for one of those at the next StarTrek convention.

I just pulled mine out, it's not as fangled as you make it sound. Look at it. Airflow is directed straight up into the sensor, across the 2 wires that MEASURE the AIRFLOW, passes on thru the sensor and down into the main airflow to the throttle body.

And the main thing that needs to be remembered is that it's not downstream a foot or two, it sits directly above the filter, mounted right on the airbox.