Idle Air Control Motors
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Anybody seing failurs of the IAC,s at about 150 hours. When they fail they trip the guardian system and default to limp in
mode. Specifically on 2004 and later 496 and 525??
mode. Specifically on 2004 and later 496 and 525??
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more so is carrosion. and not allways do they put engine into guardian mode. this is due in part to having a functional electronic side but a frozen or malfunctioning mechanical side on the i.a.c . i had 7 last week, 4 of which did not show up as fault codes. an easy way to tell is to listen for the missing hiss during start up or after shifting.