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.
Federal Models
Reed valves are actuated by exhaust vacuum being generated from pulsation in the exhaust system. Extra air is drawn through the air cleaner and supplied into the exhaust system by valve motion corresponding to exhaust vacuum. Two identical reed valves are used to supply secondary air into 2 ports in the exhaust system.
One port is at the exhaust manifold. The other port is between the 2 catalytic converters. Reed valve supplying air to exhaust manifold is actuated by pulsation in the exhaust manifold, and reed valve supplying air to catalytic converters is supplied by pulsation in exhaust system between front and rear catalytic converters.
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.