Fuel System Tests
The cylinder cutout test is a valuable tool to identify a cylinder in the engine that has a suspect performance issue. This is helpful in identifying a problem with a unit injector. In order to better understand and interpret the results of this test it would be wise to review the definition of some terms associated with the test.
A cylinder cutout test measures the power contribution of each cylinder to the total engine power, based on cylinder pulse width measurements.
Pulse width represents the quantity of fuel going into a cylinder, measured in degrees of crankshaft rotation. The higher the numbers of degrees, the more fuel being injected in the cylinder.
|Unit Fuel Injectors and Unit Pumps Technician's Guide - 7SE500|
|Generated on 10-13-2008|