Compression Test
- Run engine until operating temperature is reached.
- On turbocharged models, disconnect charge air pipe from over cylinder head. Cover opening.
- Remove upper timing belt cover. Remove cover from over ignition coils.
- Mark each ignition coil and remove. Remove spark plugs.
- Separate engine speed (RPM) sensor electrical connector.
- Switch ignition ON. Hold throttle at wide open throttle position. Switch ignition to START and crank engine over until compression gauge reads maximum cylinder pressure. Switch ignition OFF. See CYLINDER COMPRESSION SPECIFICATIONS table for nominal compression levels.
- Install components when check is complete. Tighten spark plugs to 22 ft. lbs. (30 N.m). Tighten ignition coils to 90 INCH lbs. (10 N.m). Install ignition coil cover and timing belt cover and tighten fasteners to 72 INCH lbs. (8 N.m).
- Connect turbo charge air pipe if applicable. Clear fault memory using scan tool. Start engine and check for proper function. Check for any DTCs and repair as necessary.
CAUTION:
Ignition MUST be switched OFF between each cylinder compression check. If ignition is left on for 2 minutes or longer, ECU will disable ignition.
CYLINDER COMPRESSION SPECIFICATIONS
| Engine Type | Compression Value |
|---|---|
| Turbo | 160-189 psi (1.1-1.3 MPa) |
| Turbo Type LT | 174-203 psi (1.2-1.4 MPa) |
| Non-Turbo | 189-218 psi (1.3-1.5 MPa) |