Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Air Induction (G20): Notes
Air induction is controlled by Air Induction Valve (AIV) and AIV control solenoid. AIV sends secondary air to exhaust manifold using vacuum created by exhaust pulsation. Reed valves prevent secondary air from being sent back to air cleaner when exhaust pressure is greater than atmospheric pressure.
AIV control solenoid provides vacuum to open AIV at idle and on deceleration. During acceleration, solenoid is energized, preventing vacuum from opening AIV.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.