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: Operation
The air injection control systems determine when fresh air is added to the exhaust ports. The switching points will vary with each engine, but the following conditions apply to all systems. Air is not injected when the engine is cold, when coolant temperature is above 230°F (110°C), during deceleration, or when catalytic converter temperature is above 1445°F (785°C). On vehicles with oxygen sensor, air injection is switched off if air-fuel ratio is too lean.
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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