This is a note from a well known Fuel Injector service, thought you might be interested.
The most common problem with injectors is they accumulate a buildup of wax, tars, and olefins inside the injector and on the pintle/seat area. These types of debris buildup will restrict the flow of fuel through the injector. These are elements of the gasoline that are baked on the injector after the engine is turned off and the temperature climbs to the highest point. The injectors are manufactured to such close tolerances that a 5-micron buildup (a human hair measures 40 to 90 microns) will reduce the flow up to 25%.
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