Compression Check: Testing and Inspection
Engine Compression Inspection1. Warm up the engine to normal operating temperature (cooling fan comes on).
2. Turn the ignition switch OFF.
3. Remove the ACGS (15 A) fuse from the under-hood fuse/relay box.
4. Start the engine and let it run until it stalls.
5. Remove the ignition coil cover.
6. Remove the P/S hose clamp (A). Disconnect the Intake Manifold Runner Control (IMRC) actuator connector (B), then remove the IMRC actuator (C) (J32A2 engine).
7. Remove the six ignition coils.
8. Remove the six spark plugs.
9. Attach the compression gauge to spark plug hole.
10. Connect a tachometer.
11. Open the throttle fully, then crank the engine with the starter motor and measure the compression.
Compression Pressure: Above 930 kPa (9.5 kgf/cm2, 135 psi) - 200 rpm
12. Perform the same measurement on the remaining cylinders.
Maximum Variation: Within 200 kPa (2.0 kgf/cm2, 28 psi)
13. If the compression is not within specifications, check the following items, then remeasure the compression.
^ Damaged or worn valves and seats
^ Damaged cylinder head gasket
^ Damaged or worn piston rings
^ Damaged or worn piston and cylinder bore