Which of the following can cause an engine to stall?

The correct response addresses improper timing as a significant factor that can lead to engine stalling. In an internal combustion engine, ignition timing must be precisely controlled to ensure that the air-fuel mixture is ignited at the right moment in the engine cycle. If the timing is too advanced or too retarded, it can result in poor engine performance, misfiring, or a complete stall. Miscalibrated timing can disrupt the combustion process and prevent the engine from running smoothly, leading to a total shutdown of the engine under certain conditions.

While excessive oil pressure can indicate an underlying problem in the lubrication system, it generally does not cause stalling directly. Similarly, high exhaust temperature usually suggests an issue with the combustion process or potential engine damage but is not typically a direct cause of stalling. Clogged fuel injectors can indeed disrupt the fuel delivery to the engine, potentially causing stalling; however, this would be one specific cause rather than a broader category of issues associated with timing, making improper timing a more overarching and critical factor in engine stall scenarios.