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 Injection System: Description
The air injection system is designed to reduce Hydrocarbons (HC), Carbon Monoxide (CO) and Nitrous Oxide (NOx) emissions. When air is injected into the exhaust manifold hydrocarbons are burned thereby reducing HC levels. Air is also injected into the catalytic converter to oxidize CO and HC into carbon dioxide (CO2) and water vapor.
A belt driven air pump injects air into the exhaust port of cylinder head, exhaust manifold or catalytic converter. The air injection system operates at all times and will by-pass air during rich operation, deceleration, cold engine operation or high RPMs.
The air management valve performs by-pass and diverter functions. The check valve protects the air pump from damage by preventing a backflow of exhaust gases.
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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.