I took the time to see what the IAT sensor acted like and added a test cable to the C3 connector, pins 8-9. At 74 degrees it is a resistance of about 4.5K ohms.

With the car starting up the sense voltage is like 2.4 volts and that falls as the sensor and car warm up. I took some photos of the readings FYI.

Adding a 1000 ohm resistor in series ( CORRECTION : " IT WAS IN PARALLEL - not series sorry ) caused the voltage to fall to about 1.8+ volts due to the shunting effect and the car thought that the IAT had jumped to about 94 degrees.

So the EBAY resistor in parallel would make the car think its HOTTER and thus CUT power. If the resistor were to be added in series the car would think the opposite; that it was colder inlet air. That would take some doing and not for the faint of heart. -----------------Ill do that tomorrow with a 1000 ohm resistor spliced in series to see if it assists anything.

DOing the work for you so you dont have to....Woody

My Gallery has lots of info if you have the time to research any of the projects shown in there. FYI

Some of the recorded readings on the chart are wrong due to incorrect measurment/ recording of data - sorry believe the text. WW

 

Woody, I am sure there are more than one way these are sold. The ones I saw being used bypassed the sensor all together, only using the resistor as the IAT sensor. Unplug the IAT, and plug in the resistor (with same type plug already installed on it).

James

 

Woody- Didn't you use a megasquirt to add fuel or was that a different Woody lol? A resistor honestly seems like it's not the answer. Even if it did work as planned it would add fuel across the board by a certain amount rather than just where you really need.. with too much fuel on decel the car will backfire. It would be like taking the VE table and selecting all the cells and increasing them all by the same amount. I still think ford engineer guy was just a troll.

 

I wouldn't even think of doing this without a wide band. You must know that the ECU richen's the mixture as the IAT's climb. A safe thing to do. I'd like to know how much it does this as I have a track tune and with a cold engine I'm seeing an AFR of 13.

Les

 

There was an old post by Screaming joe that said he could richen the mix with the ECT rather than the IAT. Good luck Woody, we're all counting on you.