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 MANUALSBUICK1987CENTURY CUSTOM, 4D SEDAN, 2.5 RREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMAIR INJECTION SYSTEMCOMPONENT TESTINGCHECK VALVE
1987 Buick Century Custom, 4D Sedan, 2.5 R
Check Valve
1987 Buick Century Custom, 4D Sedan, 2.5 RSECTION Check Valve
- Detach check valve and blow through in direction of flow to cylinder head. Attempt to suck back through direction of flow. Replace valve if airflow is allowed against direction of flow.
- If air pump was inoperative and had signs of exhaust gases reaching pump, a failed check valve is indicated.
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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.