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List of catalogs of this article:

• 1,< A href='#BMW m54 engine hot car needs to step on the accelerator to start' title='BMW m54 engine hot car needs to step on the accelerator to start'>BMW m54 engine hot car needs to step on the accelerator to start
• 2、BMW M54 engine intake and exhaust convex How many degrees is Vanos when the axle is idle
• 3, The BMW m54 engine is seriously shaking at idle speed, but there is no lack of cylinder air quality?

BMW m54 engine hot car needs to step on the accelerator to start

reasons for stepping on the accelerator to start: throttle valve problem, idling switch failure, water temperature sensor problem, air intake Temperature sensor problem.

The engine will be turned off because the engine starts at idle speed, and you need to step on the accelerator to get on the car, which may be caused by the high concentration of mixed gas. When the cooling machine is started, the atomization effect of the ejected fuel is not good, and a large amount of liquid fuel enters the cylinder.

The idling control fails. When the accelerator is not stepped on, the ECU will enter the idle state. At this time, the pull-wire throttle valve is completely closed. It relies on the idling motor to control the air flow of the air duct to provide the idling intake. The electronic throttle valve opens at a slight angle through the valve sheet to achieve air intake.If there is a problem with the control system and the air intake is abnormal when idling, it cannot be started.

How many degrees is Vanos when the BMW M54 engine intake and exhaust camshaft idle

The position of the BMW intake and exhaust camshaft is generally 120 degrees. Camshaft position sensor is a kind of sensing device, also known as synchronous signal sensor. It is a cylinder discrimination positioning device that inputs the camshaft position signal to the ECU, which is the main control signal of ignition control.

The relative angle position of the cam of the same name (each intake cam or each exhaust cam) on the camshaft is related to the rotation direction of the camshaft, the working sequence of the engine and the number of cylinders or the working interval angle.

degree to 50 degrees.According to the official website of BMW, the value of the position of the variable intake camshaft can be adjusted between -30 degrees and 50 degrees. When the engine load is low, the position of the variable intake camshaft will be adjusted backwards to increase the intake resistance, thus improving combustion efficiency and fuel economy.

The common failure of the M54 engine is the failure of the VANOS system, and the failure of the VANOS system is mainly due to the problem of the sealing ring. First of all, the VANOS system is known as the variable camshaft timing control system, which is used to increase the torque output of the engine at medium and low speeds, reduce the residual exhaust at idle speed, and reduce fuel consumption and emissions.

The BMW m54 engine is seriously shaking at idle speed, but there is no lack of cylinder air quality?

1. The engine carbon accumulation is serious. The most common cause of idling jitter is excessive carbonisation of the throttle valve or fuel nozzle.

2. It can also be said that any fault that causes changes in the gas force in the engine cylinder may cause the engine idling jitter. Mechanical structure (1) The failure of the gas distribution mechanism causes the power of individual cylinders to drop too much, resulting in an imbalance in the power of each cylinder.

3. Engine idle speed bad fault (1) Fault phenomenon: The engine works normally when running at medium or above speed. When the speed is idle or close to idle speed, the phenomenon of unstable idle speed or even shutdown occurs, that is, idle speed bad fault.

4. Generally, abnormal ignition is a positive problem; check whether the spark plug has aged, whether the gap is the same, and whether the gap has changed;In addition, the abnormal operation of the distributor will also cause engine shaking. Mechanical reasons: check the operating status of the engine, whether there is abnormal sound and the sound of the valve; check the working status of the belt and whether it is loose.

5. So we communicate with the customer that they have no obvious problems while driving. According to the data flow and the current car failure phenomenon, analyze the fault cause of jitter (1). Ignition coil, spark plug and fuel injector. The engine may leak air. ( 3) Exhaust system leakage or oxygen sensor failure.