What should NOT be turned ON during engine malfunctions?

In the context of engine malfunctions, it's vital to understand the role of each system involved in engine operation. When an engine is experiencing issues, certain systems should be carefully managed to avoid exacerbating the situation.

The choice involving the boost pump and ignition stands out because these systems are typically not utilized when there is an engine malfunction. The boost pump is generally used to enhance fuel delivery during normal operations. However, during an engine malfunction, activating the boost pump may lead to fuel flooding or other complications that could worsen the malfunction. The ignition system is critical for engine operation, and turning it on during a malfunction could lead to unnecessary engine starts or spark generation in an unsafe environment.

This choice reflects a cautious approach to managing systems that could potentially worsen the situation. Maintaining control over fuel delivery and ignition timing is key to addressing engine issues safely and effectively. Other combinations might involve turning on systems that either help in troubleshooting or safely managing the engine's current state, but activating the boost pump alongside the ignition during a malfunction is generally discouraged.