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 MANUALSBUICK1988RIVIERA V6-231 3.8L VIN C SFIREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )
1988 Buick Riviera V6-231 3.8L VIN C SFI
A L L Diagnostic Trouble Codes ( DTC )
1988 Buick Riviera V6-231 3.8L VIN C SFISECTION A L L Diagnostic Trouble Codes ( DTC )
Testing and Inspection- Diagnostic Trouble Code Descriptions
- B Code Charts
- C Code Charts
- Manufacturer Code Charts
- Related Tests, Information and Procedures
- A Charts
- B Charts
- C Charts
- Chart C-1 CRT Problem
- Chart C-2 Idle Air Control Motor Check
- Chart C-2 No Picture
- Chart C-2A Fuel Injector Balance Test
- Chart C-3 No Switch Responds
- Chart C-4 Some Switches Do Not Respond
- Chart C-4F-1 Misfire at Idle (C3I Ignition System)
- Chart C-5 Electronic Spark Control (ESC) Check
- Chart C-5 Picture Rolls
- Chart C-7 Exhaust Gas Recirculation (EGR) Flow Check
- Chart C-8 Torque Converter Clutch (TCC) Diagnosis
- Chart C-12 Coolant Fan Functional Check
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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.