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 adds secondary air to exhaust ports for further burning of exhaust gases. System consists of an air pump with a built-in relief valve (electric motor type on Impulse models), a check valve, an air injection manifold with air injection nozzles, an air switching valve, and a mixture control valve.
The mixture control valve prevents backfiring in the exhaust system during deceleration. In addition, California models use an electrically controlled vacuum switching valve. On Impulse, the air system is controlled by the electronic control module of the I-TEC system.
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.
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