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Learn to perform the COMPRESSION TEST and the COMPRESSION LEAK TEST, they are of great help to identify mechanical failures within the engine. AUTOMOTIVE DIAGNOSIS, AUTOMOTIVE MECHANICS. What separates a good mechanical technician from the rest is the ability to give a good diagnosis and solve the problem the first time, without a doubt this is the basis for a good reputation that translates into many satisfied customers and consequently a lot of work! These diagnostic tests that I present to you in this video are some of the ones that you will have to perform if you want to dedicate yourself to car repair and automotive mechanics, putting them into practice correctly is very important to interpret the correct results. If they are not done well, the results that they give us may not be correct. Without a doubt these diagnostic tests are very helpful! We can identify the cause of cylinder failure, identify which one is not working and why. We can identify where the compression leak is located, it could be due to a valve, either the Exhaust or Intake valve, it could be the head gasket that is burned or not sealing because the head is twisted, or the rings that are very worn.