Test Procedure
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
- Calibrate the pressure loss tester and connect to the compressed air system.
Install the pressure loss tester (1).
- Engage first gear and apply the parking brake.
- Install the connecting piece into the spark plug thread of cylinder number 1.
- Apply compressed air to cylinder number 1.
NOTE:Wheels must be in contact with the ground.
- Inspect for Pressure Loss
- Take pressure loss reading.
- The maximum permissible pressure differential between cylinders is approximately 10 percent.
- Maximum pressure loss of a cylinder is 25 percent.
- Take note of any visible escape of compressed air. In excessive leakage situations, inspect for the following conditions:
- Air leakage sounds at the throttle body, intake manifold or air inlet hose that may indicate a worn or burnt intake valve or a broken valve spring.
- Air leakage sounds at the exhaust system tailpipe that may indicate a worn or burnt exhaust valve or a broken valve spring.
- Air leakage sounds from the crankcase, oil level indicator tube, or oil fill tube that may indicate worn piston rings, a damaged piston, a worn or scored cylinder bore, a damaged engine block or a damaged cylinder head.
- Air bubbles in the cooling system may indicate a damaged cylinder head or a damaged cylinder head gasket.
- Perform pressure loss test by analogy on cylinders 3, 4 and 2.
NOTE:
Follow manufacturer instructions.