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Various kinds of BMW intake air temperature sensors are on the market. They all differ in structure and how they work. Here are the most popular ones as they are commonly known.
This sensor works by using a resistor made of pure copper as the temperature-sensing element. So, as the temperature goes up, the resistance also goes up. On the other hand, when the temperature goes down, the resistance also goes down. The engine control unit (ECU) of the vehicle gets the changes in resistance. It then uses the information to determine the temperature of the intake air.
As such, Thermocouples consist of two different metal wires. They are usually made of nickel and iron. These metals create a voltage whenever there is a difference in temperature between the two junctions. One is known as the hot junction, and the other is the cold junction. When air enters the engine and its temperature changes, the voltage produced also changes. The ECU then measures the voltage to find the intake air temperature.
This type of sensor operates the same as air-conditioning sensors. They help measure the temperature of the air inside a car. They help control the performance of the air conditioning system and provide cool or warm air, depending on the client’s needs.
NTC and PTC thermistors are the most common types of intake air temperature sensors. Buyers can usually use them for engine management systems. But, as much as they are frequently used, each has a few differences. Negative Temperature Coefficient (NTC) thermistors decrease resistance with increasing temperature. This characteristic makes them suitable for detecting high temperatures in the engine. On the contrary, Positive Temperature Coefficient (PTC) thermistors increase resistance with increasing temperature. It makes them ideal for low temperatures, such as the air entering the engine.
It is challenging to know how to choose an air intake temperature sensor for an automobile without some guidance. So, here are factors buyers should think about to help them decide on the most suitable ones for their clients.
Each BMW intake air temperature sensor is typically designed to work with a specific model and year. Therefore, it is advisable to select the sensor that matches the car model for a successful installation and optimal performance. So, buyers can stock various sensors to help them serve clients with different car models.
More importantly, the air temperature sensors should provide accurate and sensitive signals. It is because even a little temperature change can significantly impact an engine's performance, fuel efficiency, and emissions. Therefore, it is best to measure the temperature with pin-point accuracy to get precise adjustments of the air-fuel mix. Such adjustments boost engine efficiency and reduce wastage.
It is crucial to check that the temperature range of the sensors matches the vehicles' engine requirements. In that case, selecting one that can handle the extreme temperatures of intake air is essential. Generally, the ideal range for most is between -40 degrees to -100 degrees Celsius. So, check first what range is ideal for the cars of the clients and get them accordingly.
Each of these sensors will have various wiring harness lengths. Most times, it will depend on the models they fit. So, when selecting the sensors, ensure the wiring harness length matches the car the client is driving. It will ensure there are no installation complications. Also, buyers must consider the vehicle's wiring style. Some cars, for instance, have a plug and play configuration. Others have a more complicated configuration.
Socially, taking good care of the car intakes air temperature sensors is critical as it ensures optimal engine performance. But, more crucially, it prevents the need for frequent replacements. So, here are some key maintenance tips to consider when caring for these sensors.
A good cabin air filter prevents debris and other particles from clogging the intake air temperature sensors. But, over time, the air filter gets filled with dust and other particles. When it does, these particles can still pass through and cause sensor damage. So, check the condition of the air filter now and then. And replace it as soon as it's full to ensure the sensors stay in good condition.
Another crucial maintenance tip for the intake air temperature sensors is to keep the engine bay clean. Wipe it weekly or as often as possible to remove debris, dust, and any other particles that might accumulate. This practice will help prevent them from entering the engine through the air intake system and affecting the sensors.
Unfortunately, every now and then, there are operational faults in the car that go undetected. And although no obvious signs of malfunction, these faults can cause a drop in the vehicle's performance. The problem is that fault codes are easy to overlook when they are not checked. So, ensure the sensors have no fault codes every so often. Use an OBD scanner to check them. Doing so helps prevent minor issues from growing into huge problems.
Continuous engine overheating can cause significant damage to the intake air temperature sensors. To avoid this, don't let the engine overheat to high temperatures. Check the vehicle’s cooling system for leaks, worn-out hoses, and damaged belts. All these issues can cause the engine to overheat and lead to shocking conditions for the sensors. Also, avoid them by not letting the engine work too hard for long periods. For instance, during towing or driving in hilly areas.
Several of these sensors come in various models that can be compatible with multiple BMWs. They all, however, typically measure the temperature of the intake air. It helps the engine control unit optimize the air-fuel mixture for better engine performance. The materials they are mostly made of include durable and heat-resistant plastics. They ensure the sensors stay in good condition even when exposed to extreme temperatures.
As mentioned before, these sensors use NTC thermistors to detect the temperature of the incoming air. The thermistors resistance decreases as the temperature rises. The ECU then detects this change in resistance. It allows the ECU to adjust the fuel-air mixture appropriately.
Some ideal upgrades to clients' intake air temperature sensors are better performance chips. They improve the sensors' ability to measure temperature efficiently. Other than performance chips, clients can upgrade their sensors with high-quality coolant temperature sensors. It helps the engine control unit maintain optimal temperature for better engine performance.
Yes! Most of these sensors have simple plug-and-play installations. It makes the installation process hassle-free. But, although the installation is easy, the difficulty will depend on the model of the vehicle. So, for the more complex ones, using a professional is advisable.
Although it is mostly compatible with various BMW models, the specific one each client needs will depend on the year of manufacture and engine type.
