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 Guard System: Description
The Air Guard System is used on all 6-cylinder engines to reduce carbon monoxide and hydrocarbon emissions. The system adds a controlled amount of air to exhaust gases in the exhaust ports, causing oxidation of the gases. The Air Guard System used on all Eagle models consists of a belt driven air pump, diverter valve, air injection manifold and connecting hoses. A dual system input is used on all Federal vehicles which, in addition to the above, includes an air control valve, coolant temperature override (CTO) switch, upstream and downstream air input hoses. California vehicles use the Federal dual system plus an air bypass circuit and an electrically controlled air control circuit.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.