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 a controlled amount of fresh air to the exhaust gases, at the exhaust manifold or downstream, to aid in complete oxidation of the exhaust gases. This results in reduced levels of carbon monoxide (CO) and hydrocarbon (HC) emissions.
The 2.6L engine uses a pulse air feeder (PAF) system to supply this additional air. 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 air injection systems consist of a belt driven air pump, a switching/relief valve, hoses, and check valves to protect the hoses and other components from hot gases in the injection tubes.
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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.