What is a common consequence of carbon accumulation on fuel injectors?

Carbon accumulation on fuel injectors leads to an inconsistent fuel spray pattern, which can adversely affect engine performance. Over time, deposits build up from combustion byproducts and unburned fuel, which can alter the shape and size of the injector nozzles. This results in an uneven distribution of fuel when injected into the combustion chamber, causing issues such as misfires, poor acceleration, and increased emissions. Furthermore, an inconsistent spray pattern can lead to incomplete combustion, negatively impacting fuel efficiency and engine power.

The other choices do not accurately describe the effects of carbon buildup. Improved fuel flow and enhanced fuel atomization are both outcomes that are compromised by clogging and blockage caused by carbon deposits. Increased heat resistance is not a characteristic associated with carbon buildup on fuel injectors; rather, it is typically undesirable as carbon is not an effective heat conductor and can lead to cooling issues in the injectors.