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 MANUALSCHEVROLET1987CAVALIER BASE, 4D WAGON, STANDARD, MR3REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMAIR INJECTION SYSTEMCOMPONENT TESTINGDECELERATION VALVE
1987 Chevrolet Cavalier Base, 4D Wagon, Standard, MR3
Deceleration Valve
1987 Chevrolet Cavalier Base, 4D Wagon, Standard, MR3SECTION Deceleration Valve
- Remove air cleaner, plug air cleaner vacuum source and connect tachometer to engine. With engine running at idle, remove deceleration valve signal hose from intake manifold.
- Reconnect signal hose while listening for airflow through ventilation pipe and into deceleration valve. Engine speed should drop when hose is reconnected.
- If airflow lasts less than one second or engine speed does not drop, check for defective hoses or deceleration valve.
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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.