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.
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HOMESERVICE MANUALSCHEVROLET1987CHEVETTE L4-98 1.6LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSAIR INJECTIONDESCRIPTION AND OPERATION
1987 Chevrolet Chevette L4-98 1.6L
Air Injection: Description and Operation
1987 Chevrolet Chevette L4-98 1.6LSECTION Description and Operation
Fig. 1 Typical AIR system installation:
Fig. 2 Air pump without integral pressure relief valve:
Fig. 3 Air pump w/integral pressure relief valve:
In this system, fresh air is pumped into the exhaust system, usually in the area of the exhaust valves, to ignite and burn the unburned portion of exhaust gases in the exhaust system, thus minimizing exhaust contaminants.
Air systems, Fig. 1, consist of an air pump, Figs. 2 and 3, injection tubes (one for each cylinder), diverter valve, check valves (one for Inline engines, two for V8s), air manifolds and the tubes and hoses necessary to connect the various components.
Carburetors, distributors and control valves are designed for specific engine applications and should not be interchanged with other units.
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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.