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The Intake Air Temperature module is simply a resistor packaged impressively and marketed to customers who don't know any better. These can sell for as much as $25 and many are lured into purchase by its low price and easy installation.

It tricks your PCM into thinking it's cold outside and therefore 'optimizes timing'. In reality it does little to nothing and cannot change commanded timing by more than one to three degrees (and that's on a hot day where you probably can't use the extra degree or two of timing advance anyway).

Save your money and don't buy one. If your curiosity gets the best of you, buy an 8k-Ohm resistor from Radio shack and save $24.50.

Scott
 
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