Question

The customer complains that the engine cranks but does not start; the first thing to check should be

-valve train operation,
-battery voltage,
-compression,
-engine vacuum,

Answer 1

The first thing to check when the engine cranks but does not start is the battery voltage. Next, you should check the compression in the engine. Lastly, you should check the valve train operation and the engine vacuum.

Step-by-step explanation:

The first thing to check when the engine cranks but does not start is the battery voltage. If the battery is weak or dead, there may not be enough power to start the engine. Next, you should check the compression in the engine. If there is low compression, the engine may not be able to generate enough power to start. Lastly, you should check the valve train operation and the engine vacuum to ensure they are functioning properly.