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
Air injection systems, used in many applications (may vary according to engine and equipment), are designed to reduce carbon monoxide and hydrocarbon emissions. This is done by injecting fresh air at critical points in the exhaust manifold to burn those gases which passed through the combustion cycle.
System consists of an air pump with integral filter, diverter/by-pass valve, check valve(s), external or internal injection tubing and connecting hoses. Some Ford models use additional valves, depending on applications. These valves are explained below.
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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.