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More information: https://www.autodaewoospark.com/valvu... How to start your car's engine when the IAC valve is damaged or works unstable. Even if the IAC valve is completely damaged, it is possible to run the engine reliably. Using the cone of the IAC valve itself, we can block the access of idle air and by adjusting the idle screw we open the throttle a little until it sounds stable. This procedure is very reliable and you can do it in a few minutes.