Ayone done the IAT Mod?
Joined: Jun 2004
Posts: 46
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RE: Ayone done the IAT Mod?
The IAT sensor reads the temperature of the air coming into the engine. The computer uses this to determine how much gas to give the engine, the colder the temp is, the more gas it gets, and vice versa (like a choke on a carburator). I don't know where it's located on the new hemi, but on my '98 5.9 Ram, it's mounted to the intake manifold, which is hot as hell. I relocated mine to the air intake tube, which is cooler air, tricking the computer into thinking it's cold, and it gives the engine more gas.
The IAT mod, if it's what I'm thining of, is nothing more than a resistor, which you can buy for less then $1 for Radio Shack. There are 2 ways that I've heard of doing it. One is to jumper the plug to your IAT with the resistor, The other is to splice the resistor into one of the wires on the IAT. If it's too high of a resistance, your truck will run like crap because it's getting too much gas.
Another option, and the one I did, was to relocate my IAT from the intake manifold to the actual ait intake tube before the air filter. It cost like 35 cents to get a plug to put in the manifold where the sensor was, and just a few minutes to drill a hole in the air box to mount the IAT there. Now I did this on a '98 Ram with a 5.9, I have no idea where your IAT might be located on the new hemi, but I would try it the way I did if I were you. That way, if you don't like it, all you have to do is put it back where it belongs and plug the hole in the air intake, you don't have to worry about splicing wires, and The reading your computer gets will vary with the actual air temp, it just gets a reading of cooler air.
When I did it, I had a check engine light, but that went away by disconnecting the battery. I haven't had any problems since. It's really hard to tell if it improved performance, but I think it did. However, it didn't effect my gas mileage at all, so really, what can it hurt?
The IAT mod, if it's what I'm thining of, is nothing more than a resistor, which you can buy for less then $1 for Radio Shack. There are 2 ways that I've heard of doing it. One is to jumper the plug to your IAT with the resistor, The other is to splice the resistor into one of the wires on the IAT. If it's too high of a resistance, your truck will run like crap because it's getting too much gas.
Another option, and the one I did, was to relocate my IAT from the intake manifold to the actual ait intake tube before the air filter. It cost like 35 cents to get a plug to put in the manifold where the sensor was, and just a few minutes to drill a hole in the air box to mount the IAT there. Now I did this on a '98 Ram with a 5.9, I have no idea where your IAT might be located on the new hemi, but I would try it the way I did if I were you. That way, if you don't like it, all you have to do is put it back where it belongs and plug the hole in the air intake, you don't have to worry about splicing wires, and The reading your computer gets will vary with the actual air temp, it just gets a reading of cooler air.
When I did it, I had a check engine light, but that went away by disconnecting the battery. I haven't had any problems since. It's really hard to tell if it improved performance, but I think it did. However, it didn't effect my gas mileage at all, so really, what can it hurt?
