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
Pulse air system uses alternating positive and negative pressure pulsations in exhaust system to draw in fresh air through air cleaner. Check valves are used to allow fresh air into exhaust, but prevent exhaust from flowing back into intake system.
Air is switched between upstream and downstream injection by 2 vacuum-operated control valves. Each control valve is switched by an electrically operated-vacuum solenoid.
Vacuum solenoids are switched on and off by MCU according to engine operating conditions. Vacuum storage tank maintains vacuum supply to switching solenoids.
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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.