Tools Required
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
SA9127E Gage Bar Set
- Warm up the engine to a normal operating temperature of 98°C (208° F).
- Turn the ignition switch OFF.
- Remove the ignition coils. Refer to Valve Rocker Arm Cover Removal - Left Side and Valve Rocker Arm Cover Removal - Right Side .
- Remove the spark plugs.
- Attach the adapter (1), hose (2) and compression gage (3) to a spark plug hole.
- Connect a tachometer.
- Connect the scan tool.
- Turn the ignition switch to the ON position.
- Using the scan tool, command the injectors all off.
- Depress the accelerator pedal to open the throttle fully.
- Crank the engine with the starter motor and measure the compression.
- Perform the measurement on each cylinder and compare the readings.
Specification:
- Compression pressure: minimum 990 kPa (145 psi) at 200 RPM
- Maximum compression variation: 200 kPa (28 psi)
- If the compression is not within specifications, inspect for the following conditions and measure the compression again.
- Improperly adjusted valves
- Improperly positioned timing belt and sprockets
- Damaged or worn valves or seats
- Damaged cylinder head gasket
- Damaged or worn piston rings
- Damaged or worn piston and cylinder bore
- Using the scan tool, perform the PCM Reset Procedure to return the fuel injectors to normal operation.