Which testing method involves cleaning to improve fuel injector performance?

Injector cleaning is a method specifically designed to enhance fuel injector performance. Over time, fuel injectors can become clogged due to deposits from fuel and combustion byproducts, which can adversely affect their ability to deliver fuel optimally. By performing injector cleaning, technicians restore proper fuel flow, improve spray patterns, and ensure that the injectors operate efficiently. This method can involve using specialized cleaning solvents or machines that can help to remove these deposits, thus promoting better engine performance, improved fuel efficiency, and reduced emissions.

Other methods listed serve different purposes; for instance, the fuel pressure test assesses whether the fuel system is maintaining the correct pressure, which is important but does not clean injectors. Air-fuel ratio analysis measures the proportion of air to fuel entering the engine but, again, doesn't involve cleaning injectors. Data logging involves gathering performance data over time but does not directly address issues related to fuel injector cleanliness.