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I have a 1990 BJ. Does anyone know what color wires are for the IAT sensor inside my MAF sensor? I understand that they are both in the same unit.
I baught one of the diodes to give it more power. I'm not sure if it will work, but I don't know which wires to hook into either. Any help would be greatly appreciated. Thanks Guys.

Sorry to tell you this, but the thing you bought won't give you more power, and the fraudster that sold it to you was wrong about the IAT sensor.

There is no intake air temperature sensor on your car.

To answer your question, the pinouts of the MAF sensor are here:

http://bbs.legacycentral.org/viewtopic. ... 813#107813

I am using the Hitachi MAF sensor. The company that sold me the part said that by changing the ohms with this diode the computer injects more fuel, thus giving you the power increase. An my haynes manual says that my MAF sensor monitors both air temp and volume. If this won't work then what will give me a little boost? I already have a cold air intake and underdrive pulley. Could it be I need to change the ohms of the MAF sensor?

The MAF sensor doesn't work on ohms. The signal is a voltage.

The Haynes manual is not quite incorrect, but it's not quite correct either. The sensor outputs mass air flow, not volume or temperature.

There isn't a whole lot you can do easily/cheaply to bump up the power of your car... Off the top of my head: You could maybe do something with the exhaust or swap on a lightweight flywheel if it's a stick. You'll accelerate faster (and also turn better) if you put on lower-diameter tires. You can reduce weight to improve performance too. A synthetic motor lube might net you a few more horsepower than conventional motor oil. You could install a simple nitrous kit if you just occasionally want to accelerate faster.

Hey guys thanks for the input, I'm gonna see if I can send this part back.
I'm sure I'll be asking for more help as this is my first subaru. It's a fun car it just seems a little slow and I need new front seats. Thanks to all for your help. I'll chat with ya's later.

Cool. Be sure to spend some time reading through the stuff that's already on the board, because there's a lot of good information.

And welcome!