Isuzu air flow meter | Hello, I asked about the Isuzu 493 engine and today I found that there is a sensor in front of the engine leaking oil ..

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1. What is the reason for the normal operation of the air flow meter plug when the throttle of Huixi Isuzu Ruimai is increased to 3000 rpm ..

This situation may be due to a malfunction of the air flow meter itself or a problem with its wiring. The function of an air flow meter is to measure the amount of air entering the engine and transmit the signal to the cars ECU, enabling the ECU to accurately control the fuel injection amount. When the air flow meter malfunctions, it can cause the ECU to obtain inaccurate engine data, which in turn affects the normal operation of the engine. The specific reasons are as follows: Air flow meter malfunction: The internal components of the air flow meter are damaged, which will cause the output signal to be inaccurate or unstable. ECU controls fuel injection based on incorrect airflow signal, which may result in insufficient engine power and the throttle can only be increased to 3000 revolutions per minute. After unplugging the air flow meter plug, the ECU will enter standby mode and control the fuel injection amount according to the preset program. At this time, the engine can actually work normally. Line issue: There may be open circuits, short circuits, or virtual connections in the circuit of the air flow meter. This will interfere with the normal transmission of the air flow meter signal, causing the ECU to receive incorrect information and affecting the engine speed. During inspection, it is necessary to check the sensor circuit to eliminate issues such as open circuits, short circuits, and virtual connections. Other related component failures: Although the problem may be with the air flow meter, it could also be related to other components that have malfunctioned, aff

2. Hello, I asked about the Isuzu 493 engine and today I noticed that there is a sensor in front of the engine leaking oil 1. Sensors can be roughly divided into intake system, fuel supply system, ignition system, etc. according to their systems.

1、 The sensors of the intake system include air flow meter, throttle position sensor, intake absolute pressure sensor, etc. The fuel supply system is composed of coolant temperature sensors, absolute pressure sensors, oxygen sensors, etc. The ignition system is composed of a crankshaft position sensor and a cylinder synchronization signal generator, also known as a camshaft sensor, which are the reference signals for the entire engine. The engine will control the timing of fuel injection and ignition based on their signals.

2、 In addition, the engine also has some auxiliary sensors, such as a power steering sensor installed on the high-pressure pipeline of the steering power system to ensure that the engine is easy to stall when driving slowly at idle speed. When turning, the idle speed of the engine can be increased to prevent stalling. In the air conditioning system, there is also an air conditioning request signal and an engine control unit. Its function is to turn on the air conditioning when the engine i

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