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 Isuzu Impulse RSFACTORY OEM SERVICE PROCEDURE
Engine Compression
COMPRESSION RATIO
| Application | Specification | |
|---|---|---|
| Impulse | ||
| Non-Turbo | 9.8:1 | |
| Turbo | 8.5:1 | |
| Stylus | ||
| SOHC | 9.1:1 | |
| DOHC | 9.8:1 | |
COMPRESSION PRESSURE
| Application | Specification | |||
|---|---|---|---|---|
| Impulse 1.6L | ||||
| Non-Turbo | (1) 185 psi (13.0 kg/cm2 ) | |||
| Turbo | 170 psi (12.0 kg/cm2 ) | |||
| Stylus | ||||
| SOHC | 185 psi (13.0 kg/cm2 ) | |||
| DOHC | 178 psi (12.5 kg/cm2 ) | |||
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Factory Service Tools
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.