Quote:
Originally Posted by Arragonis
Does your car have a MAP or MAF sensor ?
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From the first page.
That would be a "Mass Air Flow" sensor. A "Manifold Absolute Pressure" sensor would be after the throttle plate.
A MAF sensor works by calculating temperature of the air moving by wires and seeing the resistance change with that temperature. The ECU (thinks it) knows the size of the tube and therefore the volume of air. So if the MAF sees colder air it must have more flow.
A possible confusion caused by this mod is if the temperature of the air at this location is getting colder from expanding after your restrictor plate. Thus tricking the ECU into thinking there is more flow when there is actually less. Any time the ECU gets confused by readings it did not expect, it switches to preset "open loop" mode.