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Cylinder Combustion Pressure Leakage

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect negative battery cable. Remove spark plugs. Install Cylinder Head Leakdown Tester (J-35667-A). Measure each cylinder on the compression stroke, with both valves closed.
    2. NOTE: Hold crankshaft balancer bolt in order to prevent piston movement.
  2. Apply air pressure to cylinder leakdown tester. Record the cylinder leakage readings for each cylinder. Normal cylinder leakage is from 12 to 18 percent. Make note of any cylinder with more leakage than the other cylinders. Any cylinder with 30 percent leakage or more requires service.
  3. Inspect the following primary areas in order to properly diagnose a leaking cylinder.
    • If air is heard from the intake or exhaust system, remove valve rocker arm cover of the suspect cylinder head. Ensure that both valves are closed. Inspect cylinder head for a broken valve spring or remove and inspect suspect cylinder head.
    • If air is heard from the crankcase system at the crankcase oil filler tube, remove piston from suspect cylinder. Inspect piston and connecting rod assembly. Inspect engine block.
    • If bubbles are observed in the radiator, remove and inspect both cylinder heads. Inspect engine block.
  4. After performing test, remove leakdown tester. Install spark plugs and reconnect negative battery cable.
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