Engine Cranks but Does Not Run: Description

The Engine Cranks but Does Not Run diagnostic table is an organized approach to identifying a condition that causes an engine not to start. The Engine Cranks but Does Not Run diagnostic table directs the service technician to the appropriate system diagnosis. In order for the engine to start and run, the correct amount of good quality fuel must be properly delivered to each cylinder. The timing of the valve train operation in relation to piston position is also critical, as is mechanical compression of the air/fuel mixture.

The Engine Cranks but Does Not Run diagnostic table assumes the following:

• The battery is completely charged. Refer to Battery Inspection/Test (Side Terminal Battery) or Battery Inspection/Test (Top Post Terminal Battery) .
• The engine cranking speed is acceptable. Refer to Engine Cranks Slowly .
• There is adequate fuel in the fuel tank.