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 MANUALSBUICK1985CENTURY V6-231 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONSERVICE AND REPAIR
1985 Buick Century V6-231 3.8L
Exhaust Gas Recirculation: Service and Repair
1985 Buick Century V6-231 3.8LSECTION Service and Repair
When cleaning intake manifold EGR passages, care should be taken to ensure that all loose particles are completely removed to prevent them from clogging the EGR valve or from being ingested into the engine.
1. Remove carburetor, if applicable.
2. Disconnect vacuum hose from EGR valve, then remove EGR valve to manifold retaining bolts and valve.
3. Remove deposits from EGR ports by hand using a suitable drill bit and screw driver.
4. Brush small deposits down EGR port into passages, then using compressed air, blow ports clean. Solvents should not be used to clean EGR valve or passages, since damage to system may result.
5. Install EGR valve, using new gasket.
6. Install carburetor, if applicable.
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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.