How does coolant temperature affect the fuel injection duration and quality?

Coolant temperature significantly influences fuel injection duration and quality by affecting the engine's operating conditions. When the coolant temperature is low, the engine control unit (ECU) typically extends the fuel injection duration to enrich the fuel mixture, aiding in cold starts and improving engine performance. As the coolant temperature rises to optimal levels, the ECU adjusts the injection duration to leaner settings, enhancing fuel efficiency and reducing emissions. Properly calibrated coolant temperature sensors ensure that fuel delivery is optimized for various engine temperatures, maintaining performance and efficiency.