Test kit for executing a sequence of individual cylinder tests

A test kit for interfacing with an internal combustion engine, said test kit comprising a testing program programmed to control the internal combustion engine for testing the internal combustion engine, said testing program provided with a test module programmed to execute a sequence of individual cylinder tests, wherein the test module comprises first computer code for measuring, in each cylinder test, a first engine performance value indicative of a health condition of an individual cylinder and further comprises second computer code for providing an amount of fuel to one cylinder under test to differ from an amount of fuel provided to the rest of the plurality of cylinders;

• and
• a further test module programmed to measure, in an idle period between subsequent individual cylinder tests of said sequence of individual cylinder tests, a second engine performance value;
• and said further test module comprising third computer code to discard at least some of the individual cylinder tests if the second engine performance value measured by the further test module passes a threshold.