Idle air control valve overview
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The IAC also provides another function called "throttle following". This function helps keep the engine alive when you floor it and then suddenly let off and close off the throttle valve. It temporarily opens to a certain step (also programmable in the chip) to curve the drop-off in incoming air. Some people disable this function, as they feel it hurts their braking power (as they are still receiving minimal engine power right after they let off the throttle). | The IAC also provides another function called "throttle following". This function helps keep the engine alive when you floor it and then suddenly let off and close off the throttle valve. It temporarily opens to a certain step (also programmable in the chip) to curve the drop-off in incoming air. Some people disable this function, as they feel it hurts their braking power (as they are still receiving minimal engine power right after they let off the throttle). | ||
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The IAC also has a "Keep Alive" function. If it detects a drop in RPM, it will open to help the engine from faltering or stalling. This is why you want the 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 the engine from faltering or stalling. This is why you want the 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. | ||
[[Category:Engine]] | [[Category:Engine]] | ||
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