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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Mechanical - 1.8L (LKN)) >> Diagnostic Information and Procedures >> Cylinder Leakage Test >> Test Procedure

Test Procedure

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  1. Calibrate the pressure loss tester and connect to the compressed air system.
    NOTE: Follow manufacturer instructions.
  2. Install the pressure loss tester (1).
    Fig 1: Pressure Loss Tester
    GM3462295Courtesy of GENERAL MOTORS COMPANY
    • Engage first gear and apply the parking brake.
      NOTE: Wheels must be in contact with the ground.
    • Install the connecting piece into the spark plug thread of cylinder number 1.
    • Apply compressed air to cylinder number 1.
  3. 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.
  4. 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.
  5. Perform pressure loss test by analogy on cylinders 3, 4 and 2.
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