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.
Engine Compression
When making compression checks, disconnect ignition switch connector Pink wire from high energy ignition system. Remove air cleaner. Open throttle and choke fully. Remove all spark plugs. Crank engine through at least 4 compression strokes.
| Application | Specification | |
|---|---|---|
| Compression Ratio | ||
| 2.8L | 8.9:1 | |
| 4.3L | 9.3:1 | |
| Minimum Pressure | 100 psi (7.0 kg/cm2 ) | |
| Maximum Pressure Variation | 30% | |
NO RELATED
Use the Manual With the Right Hardware
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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.