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 MANUALSBUICK1995REGAL CUSTOM, 4D SEDAN, 3.8 LREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 3.1L
1995 Buick Regal Custom, 4D Sedan, 3.8 L
Engine Controls - System/Component Tests - 3.1L
1995 Buick Regal Custom, 4D Sedan, 3.8 LSECTION Engine Controls - System/Component Tests - 3.1L
- Introduction
- Computerized Engine Controls
- Engine Sensors & Switches
- Notes
- A/C On (A/C Request) Switch Test
- A/C Pressure Sensor
- A/C Pressure Switch
- Brake Switch
- Crankshaft Position Sensor
- Engine Coolant Temperature (ECT) Sensor
- Engine Oil Level Sensor
- Intake Air Temperature (IAT) Sensor
- Knock Sensor (KS)
- Manifold Absolute Pressure (Map) Sensor (C-1)
- Manifold Air Temperature (Mat) Sensor
- Oxygen Sensor (O2S)
- Park/Neutral Position (PNP) Switch (C-1)
- Power Steering Pressure (PSP) Switch
- Throttle Position (TP) Sensor
- Vehicle Speed Sensor (Pm Generator Type)
- Vehicle Speed Sensor (Led Type)
- Motors, Relays & Solenoids
- Fuel System
- Idle Control System (C-2)
- Ignition System
- Emission Systems & Sub-Systems
- Miscellaneous Controls
- Diagnostic Charts
- Component Locations
- Wiring Diagrams
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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.