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.
Pulse Air Injection System: Description
The purpose of the pulse air injection system is to supply air to the engine exhaust gases and assist in the oxidation of hydrocarbons and carbon monoxide. The system consists of two check valves connected to the exhaust manifold by dual inlet pipes. One check valve feeds No. 1 and 4 cylinders, while the other check valve feeds No. 2 and 3 cylinders. Air is supplied to the check valves by a hose from the air cleaner.
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.
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