XC90 FWD L6-3.2L VIN 98 B6324S (2007)
If a leak is detected that is assumed to come from the valve system, first check that the piston in the relevant cylinder is at top dead center (TDC). Then
try to set the piston just before top dead center (TDC) and redo the test. When repeating the leak test on the same engine, there are usually variations in
the results of the measurements. This is due to changes in the engine coolant temperature (ECT) and the piston not reaching the same position as in the
previous test, and is affected by the amount of oil on the piston rings at the time.
Install the spark plugs. Refer to: Spark plugs, B6324S See: Spark Plug/Service and Repair