Poor Idlingĭue to a faulty ECT sensor, the fuel mixture will adjust. Some vehicles have a separate coolant temperature sensor for the fan, but many cars use the same sensor. If the fan receives a false signal, the fan might not turn on, causing the engine to overheat. 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. Also, there are many fault codes that can be set related to temperature sensors, and they mean very different things.Conclusion Symptoms Of A Bad Coolant Temperature Sensor First we have to rule out wiring and connector terminal problems associated with that part. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. Fault codes never say that on any brand or model. The last concern is the diagnostic fault code did not say to replace the sensor or that it was bad. It's much more common to find spread or corroded connector terminals that aren't making a solid connection. Ford did have a lot of trouble with the two-wire sensors in the early to mid '90s, but other than that, temperature sensors have an extremely low failure rate because there's just one component inside them. ![]() The other is for the Engine Computer and will always have two wires. One is for the dash gauge and will have just one wire connected to it. The next problem is there are usually two of them. With inline engines, they might be found on the side of the block. On V-type engines, you might also find them on the intake manifold. At this point I can't show you were they are, but you will usually find them close to the thermostat housing at the end of the upper radiator hose. They do make reference to two other coolant temperature sensors, but they aren't even shown on the electrical diagrams. There is a cylinder head temperature sensor indicated at the bottom / center of the first drawing. The first one is there is no drawing that shows the location of the coolant temperature sensors.
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