To understand the relationship between vacuum and ignition timing and reduced fuel economy in computer assisted engines. To identify the vacuum sensing device in the ignition system, 2. To perform the test used to detect a faulty vacuum sensing device, 3.
Ignition timing is the single most critical adjustment for a gasoline engine.
Thus, for optimum fuel economy, timing must be optimized. Three types of timing are used for gasoline engines. Static timing establishes a physical relationship between engine crankshaft position and the distributor. This is fixed and should not change. Computer assisted vehicles use various sensors to modify the computer controlled timing program.