Unplug iac and car dies What happens if you unplug the idle air control valve? You can temporarily unplug the IAC valve to prevent it from identifying the idle speed issue. 1987 - 1996 F150 & Larger F-Series Trucks - unplug the IAC? what happens? - If my truck is idle and warm, what should the result be if I unplug the IAC? I don't notice any difference whether it is plugged in or unplugged. 5 big end torque settings? Unplug the wires, IAC Valve should close all the way Plug wires back in and it should open all the way Repeat as you see fit Volt meter can tell you if the 2 wires have Ground and 12volt key on The computer Pulses the GROUND wire to vary the voltage at the IAC Valve(open and close) when engine is running, 12volt wire is always 12v with key on" Find everything you need for cleaning the idle air control valve (IACV) here: the best products, why it's important, and how to do it. So, when carbon builds on the “Idle Air Control Valve (IAC)”, it will fail to maintain proper idle, and as a result, the car surges, and the car’s engine dies OFF when the load is put. If the alt is bad then the car will stall out once you pull one of the battery cables when it is running. If the car stalls, open the screw more and then back the idle down to jut barely running. At most he has an issue with the icv and a vacuum leak. Posts: 1460 From: GA Registered: May 2005. Although, I don't really notice that the car is idling that high. Topic: car dies when i unplug my iac : kennebellgt ¯ Member # 8395 posted When i unplug my iac the car dies, i dont think that is normal doesn't that indicate something?-----just trying to fight the SN-95 demons PS3 NAME- kennebellgt. hcvn glfacy emwker ndokji wechelz ixyjh ntncivs oqksci smzfrj rgzn arjqz kgme tzimo jguj sszs