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: Operation
Each of the check valves in the plenum chambers is connected to an exhaust port. Firing of the engine creates a pulsating flow of exhaust gases. When positive exhaust pressure is felt, check valve will be forced closed.
No exhaust gas will flow past valve into fresh air supply line. With negative exhaust pressure (vacuum), check valve will open. Fresh air will be drawn and mixed with exhaust gases. During high engine RPM, such as under heavy acceleration, check valve will remain closed.
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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.