Coolant sensor8/2/2023 ![]() This fan is electrically controlled and relies on the signal from the onboard computer. The cooling fan, which is behind the radiator grille, removes heat from the engine’s coolant. If the air-fuel mixture is faulty, you might find your car difficult or impossible to start. The amount of fuel getting injected into the engine is critical at the moment you start your car. RELATED: Black Smoke From Exhaust (Causes & How to Fix it) 5. The excessive fuel will burn in the exhaust pipe and will produce thick black smoke. Black Smoke from the Exhaust Pipeĭue to an incorrect engine temperature signal, the ECU may enrich the fuel mixture to a point where the combustion process becomes difficult. RELATED: Radiator Fan Is Not Working? (7 Causes & How to Fix) 4. However, if your car has a single sensor, a bad engine coolant temperature sensor may result in your fans not starting. In most cars, you have two separate temperature sensors for the fans, a dashboard gauge, and engine management. Some cars use the engine coolant temperature sensor to control the electric cooling fans. This will cause the fuel economy to drop and decrease the engine’s performance. ![]() For example, a faulty sensor can send a signal indicating the engine is cold when it is not, and more fuel will heat the engine quickly. Poor MileageĪ faulty ECT sensor can send a false signal to the onboard computer, resulting in an incorrect air-fuel mixture. If you see a check engine light on your dashboard, it is time to check the trouble codes with an OBD2 scanner. If the computer detects any problem with the sensor’s circuit, it will illuminate the check engine light, indicating that the car needs an inspection. One of the first signs of all coolant temperature sensor symptoms you will probably notice is that the check engine light will show up on your dashboard. Here is a more detailed list of the signs of a bad or failing coolant temperature sensor to look for: 1. The most common symptoms of a bad coolant temperature sensor include poor mileage, cooling fans not coming on, engine performance issues, an overheating engine, and a check engine light on your dashboard. If your engine is having trouble, take it to a mechanic to get it checked out.Conclusion Symptoms Of A Bad Coolant Temperature Sensor This can cause expensive repairs, so it’s best to avoid unplugging the sensor. Additionally, the engine may overheat since it will not be able to regulate its temperature properly. You may notice black smoke coming from the tailpipe and smell raw gas since the engine will be running rich. If the engine is cold, it will take longer for the engine to warm up. In conclusion, it is important to know what happens if you unplug the coolant temp sensor. This is because the compressor makes the engine work harder and can cause it to overheat. In an effort to prevent your engine from overheating, many cars may turn on the engine fan high and may stop your air conditioning compressor to keep your engine from overheating. Your engine’s temperature won’t be known to the computer. A cold start in cooler conditions may result in the engine not starting because it is more of yet another method. ![]() The PCM will notice that the sensor is unplugged and has a default fueling technique for such a situation. If it is unplugged, the computer will not receive this information and will therefore inject more fuel than necessary.īefore starting the engine, unplugging the engine coolant temperature sensor may cause it to not start, which is more likely in the morning when it is cold. This is because the sensor monitors the temperature of the coolant and tells the computer how much fuel to inject. Similarly, If you unplug the coolant temp sensor, the air-to-fuel mixture will get richer and black smoke may result. The engine fan may also be seen to frequently switch on and off. Even if the engine light might not turn on instantly, the PCM will record a DTC (Diagnostic Trouble Code). As a result, the engine will run richer and the idle speed will increase. This is because the engine will think that the coolant temperature is lower than it actually is. Unplugging the coolant temp sensor, the idle speed will increase. Before starting the engine, unplugging the engine coolant temperature sensor may cause it not to start, which is more likely on a cold morning. When the engine coolant sensor is unplugged while the car is moving, it’s likely that the engine will stumble and sound harsh. What Happens If You Unplug The Coolant Temp Sensor
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