Powerwire.jpg

The one downside of a power wire that I have heard is eventually your PCM will relearn everything and render the power wire useless basically. So, I thought why not run the resistor on a toggle switch. I want to be able to switch the power wire on with the engine on though, and to run the resistor seperatly, when you went to flip the switch, the PCM would lose connection with the IAT for a quick second, which in turn would probably trigger an engine light.

So in the diagram, I have the 4.7k ohm resistor with a bypass wire and a toggle switch running around it. The idea is to have the toggle switch hot during normal driving, and when Im going out to mess around or I am at the light getting ready to gun it, I can flip the switch and the temp will read 20 degrees cooler, which will richen my fuel mixture. Then when Im done, flip the switch back so the computer will technically never learn that the resistor is there because it will never be constanly driven on. My question is, will having this resistor on the wire cause any problems when the toggle switch is hot? I dont want to cause unneccesary problems by having the resistor "shorting out" by having both ends connected. Obviously with the toggle switch off, the power wire will function normally. Thanks for any help. I have all the stuff I need if this idea will work, so I can hook it up tonight!

 

seems like there should be a diode in there somewhere....trying to remember back to my old electronics technology days...lol...seems like the way you have it when the switch is "on" you have essentially created a parallel circuit that would decrease the resistance when you figure in the extra wiring and switch....

 

Someone correct me if I'm wrong but, If your going to run something like that wouldnt it be better to use a 3 way switch. That way you have on-off-on and you could hook the pcm to one side and the power wire to the other. That way the resistor wont be hot on both sides when you have it on the normal mode. I hope that makes sense

 

Thats what I was wondering, because it seems too easy right now.

 

I agree that it would be a good idea to run a 3-way, but I wanted to be able to switch it with the engine running. If I switch a 3-way with the engine running, when it goes over the "off" position and to the other side, the PCM will lose connection with the IAC. Im not sure if it will trigger an engine light though. Im guessing it will.

 

So I technically couldn't add a three way switch inside the cab because the added length of wire?

 

unless it were fiber-optic wire....seriously, my take is it would negate any positive gains due to the added resistance of the switch and extra wire.

 

I think ill just put the resistor in tonight then and see what happens. It would've been awesome if I could run that switch, but I forgot its a very low current signal. It was worth a try. Thanks for your help guys. I would've hated to make the mistake of running it without asking first.

 

let me know how this works and if it is even worth it. The AIT is that sensor that is installed in the intake plenum, right?