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 Rodeo LS, RWD, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Compression

COMPRESSION RATIO

Application		Specification
Amigo, Pickup & Rodeo
2.3L & 2.6L		8.3:1
3.1L		8.5:1
Trooper
2.6L		8.3:1
2.8L		8.9:1

COMPRESSION PRESSURE

Application

Specification

Amigo, Pickup & Rodeo

2.3L & 2.6L

⁽¹⁾ 142-171 psi (9.9-12.0 kg/cm² )

3.1L

⁽²⁾

Trooper

2.6L

⁽¹⁾ 155-157 psi (10-12 kg/cm² )

2.8L

⁽³⁾ 100 psi (7.0 kg/cm² )

⁽¹⁾	Minimum pressure is 114 psi (8.0 kg/cm² ).

⁽²⁾	Information is not available from mfg.

⁽³⁾	Minimum pressure listed. Pressure should not be less than 70 percent of highest cyl.

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.

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