really, what is the difference between the two? how do you destinguish the two? I do not know if my car uses MAP or MAF. pls help me out!

tnx in advance

 

MAFS - Mass Air Flow Sensor - determines the air flow in through the throttle body so the ECU can calculate the volume of air ingested by the engine. This one is a little rigid-plastic tube that is located between the air filter box and the throttle body. Inside, a wire is stretched across the diameter of the tube. This wire is heated by the sensor, and the temperature of the wire is monitored. As air passes across this wire, it's temperature tends to drop, so more current is needed to bring the wire back up to a preset (and arbitrary) temperature. The more current needed to maintain that temperature, the more air that is passing by that wire, causing it to lose heat. The ECU will also use the reading from the Intake Air Temperature sensor to determine how warm the air flowing through the MAFS is, and calibrate accordingly.

MAPS - Manifold Air Pressure Sensor - essentially a barometer that determines the air pressure within the intake manifold. The ECU uses this and the reading from the IAT to determine the volume of air being ingested by the engine.

If you have a MAFS, you will see the rigid plastic tube on your intake setup. It's about six inches long, and will have a little yellow sticker on it basically saying "be careful...don't drop me" and an arrow (hopefully) pointing towards your throttle body. Someone else check me on this, but I believe that if you have anything earlier than the 2001 Elantra GT or the 2003 Tiburon, then you have a MAFS sensor.

 

MAP is manifold absolute pressure. It measure in manifold vaccum. As the throttle angle changes manifold vaccum will drop and the MAP is responsible for sending this info to the ECM which then calculates that amount of fuel injected.

MAF is mass air flow. It measures the the speed, density and temperature of the incomming air. The way it calculates is by a hot wire film in the air stream, it gets heated to a constant temperature, and since the incomming air will cool the hot wire film the ECM will constantly apply more or less voltage to maintain the set hot wire film. this how it calculate the amount fuel is required. hyundai uses a karman vortex type in the MAF applications. A maf systemcan be distinguished by a tube inline the the intake hose.

 

The camaro /firebird v8 cars have an awesome device called the MAF translator, it plugs inline with the mass air flow sensor wire, and it has a knob you can adjust, this allows you to add/remove fuel to compensate for mods like headers/intake... cut-outs or anything else they may have...

i wonder if it'll work with a tib/lantra maf sensor? hehe


laterz.

[ February 12, 2002: Message edited by: FordFasteR ]

 

Ford -- it's called an S-AFC

A "knob" on the MAf sensor would be a little ugly, because it would "adjust" the airflow at ALL RPM points. Most times, the engine needs more or less fuel DEPENDING on the RPM you're at.

S-AFC does this a lot better.

-Red-

 

My 99 tib had MAFS and as far as I can tell so does the 2k3 Tib GT.
If Im wrong on the 2k3 let me know but it looks like the same tube assembly.

Funny story about the 99. It was 5 hours before I was to get married and couldn't sleep so I went to work on my car (at 3am) and accendently put the sensor tube on backwards. the car will run But like Crap. 20 minutes later I figured out what I did but yea I learned that Direction was a big deal. rolleyes.gif

 

For the US market, Beta engines before 2001 used MAF's (outside the US Betas use MAP) but for the 2001 Elantra Model, Beta engine uses MAP. I'm not sure though if the 2001 Tibby uses MAP too (they are suposed to use the same engine don't they?)

 

Dixieflatline- Random just got done telling me that the 2003s have MAP

 

what does a MAP sensor look like?

 

It is a "plug" in the intake manifold with a wire lead coming off it. It does not really look like much. They are MUCH smaller than MAF's.