* Coolant Temperature Sensor Function: This sensor measures the temperature of the engine coolant and sends this information to the engine control unit (ECU). The ECU uses this data to adjust things like fuel mixture, ignition timing, and other engine parameters.
* Stall and Rough Running: These issues usually point to problems with the fuel system (e.g., fuel pressure, injectors), ignition system (e.g., spark plugs, coils), or air intake (e.g., air filter, vacuum leaks).
Here's how a faulty coolant temperature sensor might indirectly contribute to these issues:
* Incorrect Fuel Mixture: If the ECU receives inaccurate temperature readings, it might adjust the fuel mixture improperly, leading to a lean or rich condition. This could cause rough running or stalling, especially at idle when the engine is more sensitive to fuel mixture.
* Incorrect Ignition Timing: Similarly, the ECU might adjust the ignition timing based on faulty temperature readings, which could cause misfires and rough running.
However, other factors are more likely to be the cause:
* Fuel Pressure: A lack of adequate fuel pressure can cause stalling and rough running.
* Fuel Injectors: Clogged or faulty injectors can lead to uneven fuel delivery.
* Spark Plugs and Ignition Coils: Worn or damaged spark plugs or coils can cause misfires, leading to rough running.
* Air Intake: A dirty air filter or vacuum leaks in the intake system can affect the air-fuel mixture.
* Other Sensors: Faulty sensors like the throttle position sensor or oxygen sensor can also contribute to engine issues.
Recommendation:
If your engine is stalling and running rough, it's best to have it diagnosed by a qualified mechanic. They can use diagnostic tools to check for any issues with the engine control system, fuel system, ignition system, or air intake system.
Note: While a faulty coolant temperature sensor is unlikely to be the direct cause, it's good practice to have it checked during any engine diagnostic process.
