Thread: I just tested the resistor for the IAT
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Old May 2, 2011 | 05:35 PM
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waldig
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Joined: Feb 2008
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From: VA
Talking I just tested the resistor for the IAT
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

 
Last edited by waldig; May 3, 2011 at 05:41 AM.
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