wheres my MAF sensor in my 98 corolla - Toyota Nation Forum : Toyota Car and Truck Forums

Fergifruitchew · 09-17-2009, 10:23 PM

ive seen the maf sensor on the vvtis, its on the airbox, well mine isnt, i cannot find mine

all2baka · 09-17-2009, 10:36 PM

We don't have a MAF sensor on the 98 and 99

Fergifruitchew · 09-17-2009, 11:47 PM

thats what i thought,

Milky · 09-18-2009, 01:14 AM

we have a map sensor. its located on the top of the throttle body.

Fergifruitchew · 09-18-2009, 12:08 PM

do you have a picture of this? i have a spare tb and theres no sensor located on the top if it, only on the inner side and bottom

Bdub215 · 09-18-2009, 11:26 PM

Milky · 09-19-2009, 04:13 AM

thanks bdub215. that is the map sensor. you should have one located in the same spot. mine is relocated to my intake manifold since i am using a 7th gen celica throttle body and intake manifold. the celicas are all maf so there is no spot for the map sensor on its throttle body.

coro99a · 03-06-2011, 01:27 AM

Quote:

Originally Posted by Bdub215

So what are the sensor on the stock air box and I have a 1999 and bought a weapon r for it and the sensor doesn't fit.. should I had bought a 98 version instead??

Milky · 03-06-2011, 03:42 AM

the sensor in the air box is the AIT or air intake temp sensor. it should fit snuggly in the pipe. 89-99 are the same mechanically and electronically. so a 98 version would be the same.

coro99a · 03-06-2011, 08:33 AM

the way they have the 1999 pipe set up its for the maf sensor I guess because the whole is way bigger then the sensor I have in my air box..

Milky · 03-06-2011, 10:05 PM

Quote:

Originally Posted by coro99a

the way they have the 1999 pipe set up its for the maf sensor I guess because the whole is way bigger then the sensor I have in my air box..

no its for the map engine. you need to transfer a grommet into that hole to seal the sensor up. that is why the hole is larger.

1998rolla · 03-10-2011, 02:16 PM

i want to clean my maf sensor. any recommendations on what to use. i hear on some toyotas an Lexus cars with the karman vortex maf should not be cleaned with maf sensor cleaner

fishexpo101 · 03-10-2011, 03:09 PM

^^^ If you are a 1998 or 1999 Corolla - you don't have a MAF, you have a MAP sensor. (NOTE: Look at the second post, already answered here).

If you are a 2000+, then using any quick drying, non-chlorinated solvent will work. They do make specific MAF spray solvents, a decent one that is can be found most anyplace is made by CRC. The MAFs on the Corollas are the hot-wire type, so no danger to damage them unless you physically touch the sensor wire.

1998rolla · 03-10-2011, 03:15 PM

is a map sensor some thing that should be cleaned like a maf sensor

Milky · 03-11-2011, 04:13 AM

Quote:

Originally Posted by 1998rolla

is a map sensor some thing that should be cleaned like a maf sensor

no.

the map sensor or manifold absolute pressure sensor does not have air moving through it like a maf or mass air flow sensor would. the map instead reads barometric and atomspheric pressure changes inside the intake manifold. usually it will take a base barometric reading before the first start of the car, then switches over to reading absolute pressure.

a mass air flow meter uses a "hot wire" thermo-probe heated to a designated temperature . the air flowing over this probe causes the temp to drop. the ecu interprets this as more incoming air and increases voltage to the probe to maintain the designated temp. this is how it knows more air is entering the engine and corrects for proper fueling.

also the only toyota/lexus vehicles to use the karman vortex sensor were all powered by the 1uzfe 4.0l v8. iirc sc400, ls400, gs400.