A sensor is designed to send a varying output signal, whereas a resistor only generates a set signal – it’s value does not change. Anytime you have to disconnect a sensor / or place a resistor across it, it is not good for your vehicle. To sum this up, the IAT scam is basically a resistor placed across your engine sensor (typically the temperature sensor), which fools your vehicle into thinking the temperature is different than it really is, causing it to dump more fuel into the mixture and resulting in an altered air / fuel ratio. This and other similar scams will continue to draw in the novice and uneducated and these scammers must be making a lot of money from this ruse as its been around for many years.” If you run your engine lean you run the high possibility of causing permanent engine damage. In closing this post, it is very important that you do not tamper with the IAT or any other sensors on your HEMI engine in hopes of getting “free horsepower”. The exact opposite effect of these eBay ads. Adding more fuel to these mixtures DECREASES POWER and DECREASES MILEAGE. Due to EPA2 regulations, manufacturers now setup the A/F ratios to be extremely rich, especially in the upper rpm’s. Unfortunately this is not the case with new cars. This would normally add power, IF the car ran a relatively lean fuel mixture. The engine adapts by adding additional fuel to compensate for the supposedly incoming denser and cooler air. Increase power by fooling the stock ECU/PCM into thinking the incoming air is colder than it actually is.Ĭhanges the reading of the IAT sensor (intake air temp) to show cooler air then is actually entering the engine. Newer models now use a “variable” rheostat (looks like a knob) to trick individuals into thinking it is a different product. We point you in this direction because these ‘IAT performance chips’ have been proliferating on the market for several years, with varying sizes, shapes, colors and logos, but they all are essentially the same thing.
Before reading further, if you have not already seen the writeup on IAT chips by, check it out here:
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