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 MANUALSPONTIAC1991SUNBIRD BASE, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESPECIFICATIONSENGINE CONTROLS - SPECIFICATIONS - 4-CYLMECHANICAL CHECKSENGINE COMPRESSION
1991 Pontiac Sunbird Base, 4D Sedan, Standard
Engine Compression
1991 Pontiac Sunbird Base, 4D Sedan, StandardSECTION Engine Compression
Check engine compression under the following conditions: engine at normal operating temperature and specified cranking speed, all spark plugs removed, and throttle wide open.
COMPRESSION SPECIFICATIONS
| Application | Specification | |||
|---|---|---|---|---|
| Compression Ratio | ||||
| 2.0L (VIN K) | 8.8:1 | |||
| 2.2L (VIN G) | 8.9:1 | |||
| 2.3L (VIN A & D) | 9.5:1 | |||
| 2.5L (VIN R & U) | 8.3:1 | |||
| Normal Compression Pressure | (1) | |||
| Minimum Compression Pressure | (1) | |||
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RENDER: 1.0x
NO RELATED
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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.