I'm skeptical of this mod, as you'll find many others are too. But it might actually work to some degree with some testing. I'd buy my own resistors at Radio Shack though, not off of ebay.
Here's some info for ya. The IAT sensor has a negative temperature coefficient, i.e. the lower the temp--the higher the resistance--and then the PCM advances the timing and fuel pulsing accordingly.
You'll want to place the test resistor in series with the IAT sensor. One problem though is thermistors don't have a linear temp vs resistance curve. By adding the resistor, you're essentially narrowing the range of the thermistor and also moving it towards the cooler end of the temp scale. The PCM may not care, but it just might. Be prepared for a check engine light code.
Also, if your resistor value is too small, then you'll never feel the difference. And, if your resistor value is too large, then you'll probably have drivability issues.
Here's a temp vs. resistance scale I pulled from alldata. Enjoy:
Temperature / Resistance (k-ohms)
-40°F / 291.49 to 381.71
-4°F / 85.85 to 108.39
14°F / 49.25 to 61.43
32°F / 29.33 to 35.99
50°F / 17.99 to 21.81
68°F / 11.37 to 13.61
77°F / 9.12 to 10.88
86°F / 7.37 to 8.75
104°F / 4.90 to 5.75
122°F / 3.33 to 3.88
140°F / 2.31 to 2.67
158°F / 1.63 to 1.87
176°F / 1.17 to 1.34
194°F / .86 to .97
212°F / .68 to .72
230°F / .48 to .54
248°F / .37 to .41
Edit: The above figures are for the 3.5L, but I suspect the setup is similar if not identical on the 3.3L. I may be way off though. ;)
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Intrepid is sold. Info on my new ride:
'06 Pontiac GTO (PBM/Black M6 - 1 of 803)
K&N Panel Air Filter | FormulaOne Tint
!CAGS (SLP) | !Scoop Plugs | !DRL Relay
Last edited by argus; 05-25-2003 at 06:20 PM.