An intermittent no-start condition references any time where starting is possible sometimes, and other times the engine will not start. This implies that the difference between starting and failure to start is not understood.

When inserting the key, the engine may crank, the engine may sound like it is 'trying' to start, clicking may be heard, or nothing may happen at all.

In these situations, diagnostics are required to identify the cause, and the description of what happens when attempting to start the vehicle will guide where diagnostics should begin, and what the expected failure may be.