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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (Engine Mechanical - 4.6L (1 Of 5)) >> Diagnostic Information and Procedures >> Cylinder Leakage Test >> Test Procedure

Test Procedure

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: Refer to Battery Disconnect Warning .
  1. Disconnect the battery ground negative cable.
  2. Remove the spark plugs. Refer to Spark Plug Replacement .
  3. Rotate the crankshaft to place the piston in the cylinder being tested at Top Dead Center (TDC) of the compression stroke.
  4. Install the J 39313:  adapter.
  5. Install the J 35667-A:  tester or equivalent.
    6. NOTE: In order to prevent the engine from turning it may be necessary to install J 44214:  holder.
  6. Apply shop air pressure to the J 35667-A:  tester and adjust according to the manufacturers instructions.
  7. Record the cylinder leakage value. Cylinder leakage that exceeds 25 percent is considered excessive and may require component service. In excessive leakage situations, inspect for the following conditions:
    • Air leakage sounds at the throttle body 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.
  8. Perform the leakage test on the remaining cylinders and record the values.
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