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 - Vehicles Over 8500 GVW: Operation: Notes
Air pump(s) is mounted on front of engine and is belt driven. Intake air flows through an external air filter to air pump(s). Air flow from pump(s) passes through control valve(s) and air pipe(s).
Air flow passes through check valve(s) and enters exhaust manifold. Purpose of check valve(s) is to prevent a reverse flow of exhaust gasses from damaging air pump in event of a backfire or pump drive belt failure.
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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.