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.
1991 Mitsubishi Eclipse Base, StandardFACTORY OEM SERVICE PROCEDURE
Mechanical Inspection: Compression
Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions.
WARNING:
DO NOT
use ignition switch during compression tests. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate engine's oiling system.
COMPRESSION SPECIFICATIONS (1)
| Application | Specification psi (kg/cm2 ) | ||
|---|---|---|---|
| 1.5L (VIN X) | 137 (9.6) | ||
| 1.6L (VIN Y) | 171 (12.0) | ||
| 1.8L (VIN T) | 131 (9.2) | ||
| 2.0L (VIN R) DOHC | 137 (9.6) | ||
| 2.0L (VIN U) DOHC Turbo | 114 (8.0) | ||
| 2.0L (VIN V) SOHC | 119 (8.4) | ||
| 2.4L (VIN W) SOHC | 119 (8.4) | ||
| 3.0L (VIN S) SOHC | 119 (8.4) | ||
| 3.0L (VIN B) DOHC | 139 (9.8) | ||
| 3.0L (VIN C) DOHC Turbo | 115 (8.1) | ||
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Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.