The CTS is responsible for sending the engine temperature signal to the engine control unit (ECU). If the sensor is faulty, the ECU may not receive the correct temperature signal and may not be able to adjust the fuel mixture accordingly. This can lead to starting issues when the engine is hot, as the fuel mixture may be too lean.
Symptoms of a faulty CTS:
- Engine overheating
- Engine stalling
- Poor fuel economy
- Check engine light illumination
2. Oxygen sensor failure
The oxygen sensor is responsible for measuring the amount of oxygen in the exhaust gas and sending a signal to the ECU. This signal is used by the ECU to adjust the fuel mixture. If the oxygen sensor is faulty, the ECU may not be able to adjust the fuel mixture accordingly, which can lead to starting issues when the engine is hot.
Symptoms of a faulty oxygen sensor:
- Check engine light illumination
- Poor fuel economy
- Engine performance issues
- Black smoke from the exhaust pipe
3. Fuel injector failure
Fuel injectors are responsible for spraying fuel into the engine cylinders. If a fuel injector is faulty, it may not be able to deliver the correct amount of fuel to the cylinders, which can lead to engine starting issues.
Symptoms of a faulty fuel injector:
- Engine misfires
- Engine stalling
- Poor fuel economy
- Check engine light illumination
4. Ignition coil failure
Ignition coils are responsible for creating the spark that ignites the fuel mixture in the engine cylinders. If an ignition coil is faulty, it may not be able to produce a strong enough spark, which can lead to engine starting issues.
Symptoms of a faulty ignition coil:
- Engine misfires
- Engine stalling
- Poor fuel economy
- Check engine light illumination
5. Spark plug failure
Spark plugs are responsible for conducting the spark from the ignition coil to the engine cylinders. If a spark plug is faulty, it may not be able to conduct the spark properly, which can lead to engine starting issues.
Symptoms of a faulty spark plug:
- Engine misfires
- Engine stalling
- Poor fuel economy
- Check engine light illumination
Note: These are just a few of the possible causes of a Nissan starting when it's cold but not when it's hot. If you are experiencing this issue, it is recommended that you have your vehicle inspected by a qualified mechanic to determine the exact cause of the problem.
