What Causes an Automatic Transmission to Not Move When in Gear?

Where is the oil level sensor located on a BMW 730?

It is generally located at the rear of the engine, on the cylinder block, next to the oil filter housing. There is a wired connector on it, situated on the oil passage in front of the oil filter. Oil Level Sensor: The electronic oil pressure sensor consists of a thick-film pressure sensor chip, signal processing circuit, housing, fixed circuit board assembly, and two leads. The signal processing circuit includes a power supply circuit, sensor compensation circuit, zero adjustment circuit, voltage amplification circuit, current amplification circuit, filtering circuit, and alarm circuit. Function of the Oil Level Sensor: The oil level sensing component is installed in the engine oil. During operation, the sensor continuously cycles through heating and cooling of the heating element (heating time is about 20ms, cooling time is about 5ms).

7

4

Share

Are the transmissions of the Teana and Sylphy the same?

The transmissions of the Teana and Sylphy are products of the same period, with only the model numbers being different. Functions of the transmission: 1. Change the transmission ratio: Alter the transmission ratio to expand the range of torque and speed variations of the driving wheels, adapting to frequently changing driving conditions, while allowing the engine to operate under favorable conditions (higher power and lower fuel consumption). 2. Enable reverse driving: Allows the vehicle to move backward while the engine's rotation direction remains unchanged. 3. Gear shifting: Utilizes neutral gear to interrupt power transmission, enabling the engine to start, change speed, and facilitate gear shifting or power output.

14

1

Share

How often should the Buick Excelle change engine oil?

Buick Excelle should have its engine oil changed every 10,000 to 15,000 kilometers. It is generally recommended to use the original 5W30 semi-synthetic engine oil. Method for changing engine oil: When adding engine oil, ensure the oil level is between the min and max marks on the dipstick. The oil level should not be below the min mark or above the max mark. If the oil level is below the min mark, it can lead to insufficient lubrication, increasing engine wear. If the oil level is above the max mark, it can increase engine resistance during operation, resulting in reduced power and higher fuel consumption. Always check the oil level carefully when adding oil. Precautions for changing engine oil: Engine oil should be changed regularly, and different types of oil should not be mixed. Fully synthetic oil should be changed every 8,000 to 10,000 kilometers, semi-synthetic oil every 5,000 to 8,000 kilometers, and mineral oil around every 5,000 kilometers. Regularly clean the engine air filter and replace the oil filter. After adding oil, sludge and carbon deposits on engine parts disperse into the oil, causing it to darken over time. Typically, the viscosity of the oil should be checked to determine if a change is needed, rather than relying solely on the color. If the oil level is too low, insufficient lubrication can cause cylinder scuffing. If the oil level is too high, it can affect vehicle performance and increase fuel consumption.

9

4

Share

What Causes Engine Shaking at Idle but Smooths Out When Accelerating?

Engine shaking at idle that smooths out when accelerating is a symptom of unstable idle speed, which is one of the most common faults in the daily maintenance of electronically controlled engines. The reasons for idle shaking that disappears upon acceleration include excessive carbon buildup on valves and intake pipes, malfunctions in idle control sensors and related circuits, among others. Below are detailed explanations of the specific causes: 1. Excessive carbon buildup on valves and intake pipes: Carbon deposits can absorb a certain amount of fuel, leading the electronic control unit (ECU) to make incorrect judgments. For example, if the ECU commands the injection of 100 units of air-fuel mixture but only 90 units actually enter the cylinder (with 10 units absorbed by carbon deposits), even if the remaining 90 units burn completely, the required power output cannot be achieved, inevitably causing shaking. 2. Malfunctions in idle control sensors and related circuits: For instance, if the idle switch fails to close, the ECU may mistakenly assume the engine is under partial load, leading to incorrect air intake control. Issues such as delayed or stuck idle valves due to oil contamination or carbon buildup, or a throttle valve not closing properly, can prevent the ECU from accurately adjusting the engine's idle speed. Additionally, faults in the intake air temperature sensor, air flow sensor, coolant temperature sensor, or short circuits/open circuits in sensor circuits can all result in unstable engine idle. 3. Leaks in the intake pipe and various valves: Common issues include cracked intake manifolds or poor sealing of intake manifold gaskets. When there are leaks in the air supply system, the ECU receives inaccurate air intake signals, leading to misjudgments and unstable engine idle.

5

2

Share

What's the Difference Between Tesla All-Wheel Drive and Rear-Wheel Drive?

Tesla all-wheel drive and rear-wheel drive differ in the following aspects: 1. Different driving methods: Rear-wheel drive is suitable for mid-to-high-end electric sedans, while all-wheel drive is typically only equipped in high-end SUVs. 2. Different operational performance: Electric all-wheel drive offers the highest cornering limits on roads, with superior handling performance compared to rear-wheel drive. However, it requires more complex electronic control systems and has a more intricate structural design, even when equipped with batteries of the same capacity. 3. Different range capabilities: Rear-wheel drive vehicles generally have better range than all-wheel drive electric cars. However, in terms of instant power bursts, all-wheel drive is more aggressive, such as in 0-100 km/h acceleration, where all-wheel drive outperforms rear-wheel drive.

10

0

Share

What is the reason why the BMW 730 does not automatically retract the rearview mirrors when locked?

BMW 730 does not automatically retract the rearview mirrors when locked for the following reasons: Battery disconnected or dead: In this case, the exterior rearview mirrors must be reset to function properly. The specific reset method is to manually operate the folding button. After setting "fold mirrors when locking," manual folding was performed: In this case, the exterior rearview mirrors will not automatically unfold after the next vehicle unlock. You need to enter the vehicle and press the button on the door to manually unfold the exterior rearview mirrors. Function of rearview mirrors: Rearview mirrors with folding function can be retracted when passing through narrow sections, improving the vehicle's passability. When the driver leaves the vehicle, the rearview mirrors can also be folded, which not only protects the mirror surface but also reduces parking space and effectively avoids scratches.

9

4

Share

What Causes an Automatic Transmission to Not Move When in Gear?

Where is the oil level sensor located on a BMW 730?

Are the transmissions of the Teana and Sylphy the same?

How often should the Buick Excelle change engine oil?

What Causes Engine Shaking at Idle but Smooths Out When Accelerating?

What's the Difference Between Tesla All-Wheel Drive and Rear-Wheel Drive?

What is the reason why the BMW 730 does not automatically retract the rearview mirrors when locked?

Can a Mercedes Still Be Driven with an Auxiliary Battery Malfunction?

Is the Vision Chart for Driving Schools Standardized Nationwide?

Is the rear armrest standard across the entire Bestune B70 lineup?

What is the maintenance interval for the Passat PHEV?