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.
1990 Isuzu Impulse AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Compression
COMPRESSION SPECIFICATIONS
| Application | Specification | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Compression Ratio | |||||||||
| Amigo & Pickup | |||||||||
| 2.3L & 2.6L | 8.3:1 | ||||||||
| Impulse 1.6L | 9.8:1 | ||||||||
| Trooper | |||||||||
| 2.6L | 8.3:1 | ||||||||
| 2.8L | 8.9:1 | ||||||||
| Compression Pressure | |||||||||
| Amigo & Pickup | |||||||||
| 2.3L & 2.6L | (1) 142-171 psi (9.9-12.0 kg/cm2 ) | ||||||||
| Impulse 1.6L | (2) 185 psi (13.0 kg/cm2 ) | ||||||||
| Trooper | |||||||||
| 2.6L | (1) 155-157 psi (10-12 kg/cm2 ) | ||||||||
| 2.8L | (3) 100 psi (7.0 kg/cm2 ) | ||||||||
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Factory Service Tools
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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.
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