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 Suction System: Operation
Air is drawn through air filter(s) and air suction valve(s) into exhaust ports of all cylinders on Pickup and Starlet, and into cylinders 3 and 4 on Tercel. The Pickup uses a system of control and switching valves and a computer to delay air suction during rapid deceleration, while the Tercel uses a restrictor to accomplish the same purpose. This prevents engine backfiring on deceleration.
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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