L Series V6-3.0L VIN R (2004)
Important: The minimum compression in any one cylinder should not be less than 70 percent of the highest cylinder. No cylinder should read less
than 690 kPa (100 psi).
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Normal compression: Builds up quickly and evenly to specification in each cylinder.
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Low compression: Damaged piston, rings, valves, or head gasket.
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High compression: Carbon on pistons/combustion chamber.
Important: A cylinder leakage test can be performed to further determine the location of the compression leakage if one or more cylinders are
extremely low.
9. If the cylinder compression in one or more cylinders is low, pour a small amount (1 teaspoon) of engine oil into the cylinder through the spark plug
hole.
10. Place the shop towel over the plug holes to capture any oil mist/spray.
11. Crank the engine over for a few seconds without the compression gage or spark plugs installed.
12. Repeat previous steps 4-7 and measure the compression.