Carry out cylinder compression test a compression test is used to check for mechanical faults related to the piston and combustion chamber

.. .Carry Out Engine Vacuum Tests Note that It is important to check that the ignition timing and the exhaust gas constituents are correct before carrying out manifold vacuum tests Follow the. .. mixture, manifold gasket leaks or, wear of all cylinders and piston rings A rapidly oscillating needle on the gauge can indicate defects in individual cylinders This could be valve seating, piston. .. at about 2500 rpm Test Results Record the results obtained and compare them with manufacturer data and diagnostic tables in order to be able to correctly interpret the results Vacuum test readings