do all impreza have them?
03 July 2007, 10:13 PM
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Mass Air-Flow meter (MAF) 
It measure volume of air at a set sampling rate which = mass which = airflow, i.e the same
However there are three types: Spring loaded Flap sensor, Hot wire sensor and Hot film sensor. Subarus are Hot film sensors.
It measure volume of air at a set sampling rate which = mass which = airflow, i.e the same
However there are three types: Spring loaded Flap sensor, Hot wire sensor and Hot film sensor. Subarus are Hot film sensors.
Last edited by Shark Man; 03 July 2007 at 10:20 PM.
03 July 2007, 10:18 PM
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My edit should help clarify, as the old Bosch (L- jetronic onwards) one were flappers 
Uuless we're talking about K-jetronic (mechaincal injection) where the flap controls valves and stuff.
Uuless we're talking about K-jetronic (mechaincal injection) where the flap controls valves and stuff.
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03 July 2007, 10:24 PM
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Thats them,
I'm very familiar with the L-tronic J-tronic and kinda know the K-tronic.
Seen the Classic style air flow but didn't realise how it worked.
What is fitted to the newage, the same?
I'm very familiar with the L-tronic J-tronic and kinda know the K-tronic.
Seen the Classic style air flow but didn't realise how it worked.
What is fitted to the newage, the same?
03 July 2007, 10:37 PM
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My mate 93' WRX has a 'wire' in a plastic tube type thing. Similar looking thing to an J-tronic flow meter but alot less bulky.
He says you have to be carefull if you oil the filter as too much can damage them??
He says you have to be carefull if you oil the filter as too much can damage them??
Last edited by Northern Nick; 03 July 2007 at 11:02 PM. Reason: cant spell for jack sh*t
03 July 2007, 10:57 PM
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He's right, the wire works by being heated and airflow over it cools it. Which affects its resistance. (Film ones work in the same way).
If its coated with oil, dust or crap. It insulates it so airflow doesn't cool it as much. Typically it ends up with the car running lean. And on a older Impreza, which runs open loop at high boost, it eventually leads to killing the engine (melted pistons, overloaded bearings etc). All down to a dodgy sensor and/or bad choice of filter.
They can be cleaned with brake cleaner or carburettor cleaner, but I've seen mixed outcomes from doing this. Hot wire ones seem ok with being cleaned this way, at least.
If its coated with oil, dust or crap. It insulates it so airflow doesn't cool it as much. Typically it ends up with the car running lean. And on a older Impreza, which runs open loop at high boost, it eventually leads to killing the engine (melted pistons, overloaded bearings etc). All down to a dodgy sensor and/or bad choice of filter.
They can be cleaned with brake cleaner or carburettor cleaner, but I've seen mixed outcomes from doing this. Hot wire ones seem ok with being cleaned this way, at least.
Last edited by Shark Man; 03 July 2007 at 11:00 PM.
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