Explanation: The temperature sensor, also known as the coolant temperature sensor, plays a crucial role in monitoring the engine's temperature and sending this information to the engine control unit (ECU). If this sensor becomes faulty or malfunctions, it may provide incorrect temperature readings to the ECU.
When the engine is cold, the ECU receives the incorrect low temperature signal from the faulty sensor and enriches the fuel mixture accordingly, allowing the engine to start without issues. However, when the engine heats up, the faulty temperature sensor continues to provide inaccurate readings, causing the ECU to maintain the rich fuel mixture. This can lead to starting difficulties when the engine is hot, as the excessive fuel can hinder proper ignition.
Possible Solutions:
1. Inspect and Test: Diagnose the temperature sensor by checking its connections and wiring for any damage or corrosion. Use a multimeter to test sensor's resistance according the manufacturer's specifications.
2. Replacement: If the temperature sensor is found to be faulty, replace it with a new one. Ensure that the new sensor matches the specifications of your vehicle. Clear any fault codes stored in the ECU after the replacement.
3. Coolant System Check: In addition, inspect the coolant system for any leaks or air pockets that may affect the accurate temperature readings. Ensure the coolant level is adequate and consider a coolant system flush if necessary.
