Compression Pressure Inspection
- Warm up the engine to normal operating temperature.
- Remove the fuel pump fuse (15A).
- Wait until the engine has stopped (runs out of fuel).
- Remove the ignition coils and spark plugs.
- Crank the engine to remove any foreign material in the cylinders.
- Put a compression pressure gauge into spark plug hole.
- Check compression pressure at each cylinder.
Compression pressure specification:
Standard: 178 psi (200~250 RPM)
Minimum: 156psi
Difference between each cylinder: 14 psi or less
- Is compression pressure for each cylinder displayed within specifications?
YES
- Go to "Ignition System Inspection " procedure below.
NO
- Add a small amount of oil through the spark plug hole, and repeat the steps above.
If the addition of oil causes the compression to rise, the cause is a worn or damaged piston ring or cylinder inner surface.
- If the compressions at each cylinders are not same or not similar, a burnt or defective valve seat, worn head gasket and/or pressure rings can be the cause of vibration of engine. Repair as necessary and go to "Verification of Vehicle Repair " procedure.