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intermittent miss on 3 different trucks

lcmartin
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Timbo

Timbo

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What I do is get this extension harness.http://www.wbodystore.com/IAT-Extension-Harness-p-65.html I then use a 1k resistor inline with the switch to just jump across the 2 wires.This way when the switch is flipped one way, that circuit is open and the ecm is reading actual iat temp. When you flip it the other way it adds the 1k across the two wires lowering the total resistence thus the ecm thinks its hot and pulls timing out. In cold weather, it starts much easier when the ecm gets the actual iat reading to advance timing for cold start.

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