What should you check if an engine is having difficulty starting?

When an engine has difficulty starting, checking the battery condition is crucial. The battery supplies the electrical power needed to start the engine. If the battery is weak, dead, or not providing sufficient voltage, it can prevent the engine from cranking or starting altogether. Signs such as dim lights, a clicking sound when turning the ignition key, or slow cranking indicate that the battery might be at fault.

While engine oil level, coolant level, and transmission fluid are important to an engine's overall health and performance, they are not the primary factors in initial starting difficulties. Engine oil levels affect lubrication and efficiency, coolant levels pertain to temperature regulation, and transmission fluid impacts shifting and engagement of the drivetrain, but typically have minimal influence on the engine starting process directly. Thus, ensuring that the battery is in good condition is the first step in diagnosing starting problems.