Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.

ENGINE COMPRESSION SPECIFICATIONS

Application

Specification

Normal Compression Pressure

psi (kPa)

1.8L

⁽¹⁾ 218 (1500)

1.9L

185-205 (1276-1414)

3.5L

Aurora

140-170 (965-1172)

Intrigue

⁽²⁾

4.0L & 4.6L

140-170 (965-1172)

All Others

⁽³⁾

Minimum Compression Pressure

1.8L

⁽¹⁾ 145 (1000)

1.9L

180 psi (1241 kPa)

3.5L

Aurora

⁽⁴⁾

Intrigue

⁽²⁾

4.0L & 4.6L

⁽²⁾

All Others

⁽³⁾

⁽¹⁾	No cylinder compression reading should be less than 15 psi (100 kPa) of highest compression reading.

⁽²⁾	Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 140 psi (965 kPa).

⁽³⁾	Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (690 kPa).

⁽⁴⁾	Information is not available from manufacturer.

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.

Safety Warning

Engine Compression