The tip of the fuel-system spear, fuel injectors incorporate an electronically controlled valve and a nozzle that sprays fuel into each of an engine’s intake ports, or directly into its cylinders. Now the norm for more than 20 years, fuel injection has practically eliminated the complications of cold starts, engine flooding and altitude sensitivity. Fuel injector failure might appear as rough engine performance and/or hesitation, likely accompanied by the check engine light. Fuel leaks are another possible, and dangerous, sign of failure, often at the seal where the injector meets the engine.
