Idle air control valve overview
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The IAC also has a "Keep Alive" function. If it detects a drop in RPM, it will open to help "keep alive" the engine. This is why you want your warm idle setting to be at or below its half open range. For instance, if at idle the IAC was at 140 steps (almost fully open) it wouldn't have much room to open up to keep the engine running. | The IAC also has a "Keep Alive" function. If it detects a drop in RPM, it will open to help "keep alive" the engine. This is why you want your warm idle setting to be at or below its half open range. For instance, if at idle the IAC was at 140 steps (almost fully open) it wouldn't have much room to open up to keep the engine running. | ||
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