When it comes to diesel engines, fuel injectors play a crucial role in power, efficiency, and smooth operation. But over time, stock injectors can wear out or fall short of your engine’s full potential. If you’re noticing performance issues, it might be time to consider an upgrade. Here are five signs it's time to replace those old injectors with high-quality performance injectors. Loss of Power and Throttle Response If your truck feels sluggish or struggles to accelerate, it’s a clear sign your injectors aren’t firing like they used to. Performance injectors can restore — and often boost — throttle response, giving your engine the kick it’s missing. Excessive Smoke from the Exhaust While a bit of smoke is normal under heavy load, clouds of black or white smoke often signal injector issues. Performance injectors offer cleaner, more precise fuel delivery, reducing smoke and emissions significantly. Poor Fuel Economy Old or clogged injectors can ...