An idle air control valve literally bypasses air around a closed throttle plate so the engine can get air at idle. Because it bypasses air, it’s also called an air bypass valve. … That allowed more air to pass, create more suction, and move more gas into the cold engine.

What are the symptoms of a bad idle air control valve?

• Irregular Idle Speed. …
• Check Engine Light Illuminated. …
• Rough Engine Idle. …
• Engine Stalling. …
• Stalling Under Load. …
• How To test the coil driver circuits in the (IAC) valve:

How do you reset your idle air control valve?

Turn the ignition ON and leave on for several seconds then turn the ignition OFF to allow the ECM to reset the IAC valve. You should be good to go.