MASTERING iN-CYLINDER PRESSURE TESTING Ⅳ

摘要

This simple technique has changed the way the internal combustion engine is diagnosed around the world. If you are not aware of the power of this simple truth please read the Motor Age articles "Mastering In-Cylinder Pressure Testing," installments I, n and Ⅲ. These articles cover the basics of in-cylinder compression waveforms at crank, idle and snap throttle. This technique is not only good when used to find failures, but is great in eliminating possible problems as well. I can recall a time when checking a drivability problem would include checking the ignition timing, not necessarily to find an ignition timing problem, but to rule one out. The in-cylinder compression waveform can be used in the same way. Many times in my career I have found myself diagnosing a problem with an engine I thought was of a mechanical nature, but with no way to confirm my suspicions. Now, with this game-changing technique, you can test the mechanical condition of the engine quickly and accurately.