How can an injector pulse width affect engine performance?

The correct choice highlights that the pulse width of an injector directly influences its opening duration, which in turn affects the amount of fuel delivered to the engine. When injectors open for longer periods (greater pulse width), they allow more fuel to flow into the combustion chamber, enriching the air-fuel mixture. Conversely, a shorter pulse width restricts fuel delivery, leading to a leaner mixture.

This relationship is crucial because the proper balance of air and fuel is vital for optimal engine performance, fuel efficiency, and emissions. An incorrectly tuned pulse width can result in various issues; for instance, too much fuel can lead to incomplete combustion, while too little fuel can cause engine knocking and reduced power output.

Other options do not accurately reflect the role of pulse width. The claim that it has no impact on fuel delivery overlooks its fundamental function; similarly, stating that it solely affects engine noise levels misrepresents its purpose, as injector operation primarily targets fuel mixture preparation rather than noise control. Lastly, associating pulse width with air intake regulation confuses the roles of fuel injectors and air management systems in combustion engines.