Purpose of inspection
By confi rming the change in the engine speed when the combustion of each cylinder is stopped in turn for power balance inspection, judge whether or not the malfunction affects the specifi c cylinder or all the cylinders.
Inspection method (gasoline engines)
Remove the injector connectors one by one while the engine revolves to check the engine speed and how the vibration changes.
Criteria
The engine speed does not decrease, or if there is a cylinder that has a small change, the malfunction is in the cylinder.
When judgement is diffi cult, slightly increasing the engine speed will make it easier.
Inspection method (diesel engines)
To check the engine speed and vibration, control the amount of fuel injected into the cylinders by slowly loosening and tightening the union nut of the injection nozzle, check the engine speed and vibration.
Criteria
The engine speed does not decrease, or if there is a cylinder that has almost no change, the malfunction is in the cylinder.
• If one cylinder injects more than other cylinders or if there is more power than other cylinders, the engine revolves unstably. In such a case, loosening the union nut to release the fuel may stabilize engine revolution.
• With a common rail diesel engine Using an intelligent tester, stop the fuel injection in each cylinder to perform the inspection.