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post #1 of 4 (permalink) Old 05-25-2003, 11:08 AM Thread Starter
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Does the resistor thing work

Does anyone have a 3.3 with the resistor mod on the intake air sensor? Is it a noticable mod or not. Is it worth the $7 to $15 on ebay?
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post #2 of 4 (permalink) Old 05-25-2003, 06:16 PM
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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)

-40F / 291.49 to 381.71

-4F / 85.85 to 108.39

14F / 49.25 to 61.43

32F / 29.33 to 35.99

50F / 17.99 to 21.81

68F / 11.37 to 13.61

77F / 9.12 to 10.88

86F / 7.37 to 8.75

104F / 4.90 to 5.75

122F / 3.33 to 3.88

140F / 2.31 to 2.67

158F / 1.63 to 1.87

176F / 1.17 to 1.34

194F / .86 to .97

212F / .68 to .72

230F / .48 to .54

248F / .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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Last edited by argus; 05-25-2003 at 06:20 PM.
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post #3 of 4 (permalink) Old 05-25-2003, 06:24 PM
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Re: Does the resistor thing work

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Originally posted by milehieagle
Does anyone have a 3.3 with the resistor mod on the intake air sensor? Is it a noticable mod or not. Is it worth the $7 to $15 on ebay?
even if it does work. you can pick up a resistor at your local radio shack for about $1.

that's all this guy is gonna send you anyways
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post #4 of 4 (permalink) Old 05-25-2003, 07:26 PM Thread Starter
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Thats kinda what I thought. I see tons of them on the bay claiming 15 to 20 HP which sounds crazy for the money. I figured it was a radio shack item. I think you can pick up a 5 pack of resistors for $1 can't you? I always wondered if this was a worth while deal.
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