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 Systems: Description
The Air Injection System adds a controlled amount of fresh air to the exhaust gases at the exhaust manifold or downstream to aid in complete oxidation of the gases. This results in reduced levels of carbon monoxide and hydrocarbon emissions. The 2.6L engine uses a Pulse Air Feeder (PAF) system to supply this additional air, while all other engines use an air pump air injection system. The Pulse Air Feeder system consists of a main-reed valve and a sub-reed valve within the pulse air feeder to control air flow. Air pump injection systems consist of a belt driven air pump, a combination diverter-pressure relief valve, a switching valve, hoses and check valves to protect the hoses and other components from hot gases, and injection tubes.
Use the Manual With the Right Hardware
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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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