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What Causes Loud Engine Noise During Startup?

1 Answers
SanSamantha
07/30/25 8:39am
The loud noise during engine startup is primarily caused by excessive engine oil, which increases the stirring resistance of the crankshaft connecting rod, leading to amplified noise. Below are extended details regarding oil changes: Changing Engine Oil and Oil Filter: It is essential to change the engine oil promptly during vehicle maintenance. If the oil turns black, becomes thin, or contains sand particles, usage should be discontinued immediately. Prolonged use of unchanged or deteriorated oil not only fails to provide lubrication but also damages the engine. It is advisable to replace the oil filter simultaneously during an oil change to prevent contaminants from the old filter from compromising the quality of the new oil. Considerations for Selecting Engine Oil: When selecting engine oil, opt for lower viscosity grades. Low-viscosity oils offer better fluidity, effectively reducing engine wear. Engine oil functions as hydraulic fluid within the hydraulic lifters. Given the engine's high rotational speed, the frequency of oil flowing in and out of the hydraulic lifters is also very high. When the oil viscosity is too high, it results in insufficient oil intake per cycle, causing delayed hydraulic lifter response. This leads to inadequate extension of the pushrods, increased valve clearance, and consequently, valve noise.
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What is the process for downgrading a driver's license?

Process: The motor vehicle driver or their agent should bring the required materials to the service window of the vehicle management office branch or the driver's license management window of the traffic police detachment (brigade) in each district (county). If applying for a voluntary downgrade of the permitted driving category at a vehicle management office outside the jurisdiction where the driver's license was originally issued, the transfer procedures must be completed as required. Required materials: "Motor Vehicle Driver's License Application Form". Identity proof and photocopy of the motor vehicle driver. Motor vehicle driver's license. Driver's license photo. If simultaneously applying for renewal upon expiration, submit the "Motor Vehicle Driver's Physical Condition Certificate". Two recent front-facing, bareheaded, white-background color ID photos (submit the digital photo collection receipt if required by local regulations). If applying for a voluntary downgrade of the permitted driving category at a vehicle management office outside the jurisdiction where the driver's license was originally issued, the transfer procedures must be completed as required, and the original "Motor Vehicle Driver's Health Status Declaration Form" must be submitted. For proxy applications, a power of attorney and the agent's identity proof and photocopy must also be submitted. For drivers holding licenses for large buses, tractors, city buses, medium-sized buses, or large trucks, the vehicle management office shall revoke their highest permitted driving category qualification and notify the driver to complete the downgrade and license replacement procedures within 30 days under the following circumstances: Downgrading a driver's license refers to the vehicle management office revoking the highest permitted driving category qualification of drivers holding licenses for large buses, tractors, city buses, medium-sized buses, or large trucks if they are involved in a traffic accident causing death without constituting a crime, accumulate 12 penalty points in one scoring cycle, or fail to participate in the review for three consecutive scoring cycles, and notifying the driver to complete the downgrade and license replacement procedures within 30 days. Being involved in a traffic accident causing death, bearing equal or greater responsibility, without constituting a crime. Accumulating 12 penalty points in one scoring cycle. Failing to participate in the review for three consecutive scoring cycles. If the motor vehicle driver fails to complete the downgrade and license replacement procedures within the specified time, the vehicle management office shall announce the revocation of the permitted driving category qualification. After completing the downgrade and license replacement procedures, if the motor vehicle driver applies to reinstate the revoked permitted driving category, they must have no record of accumulating 12 penalty points in the current scoring cycle and the most recent scoring cycle before application, and no involvement in a traffic accident causing death with equal or greater responsibility. Procedure for revoking the highest permitted driving category and completing the downgrade and license replacement: After passing the relevant examination, receive the "Motor Vehicle Driver's Illegal Full-Point Examination Information Feedback Notice" (for Class A and B licenses, the downgrade information will be noted on the notice). After the suspension period ends, bring the ID card and the "Motor Vehicle Driver's Illegal Full-Point Examination Information Feedback Notice" to the traffic police team where the license was suspended to retrieve the driver's license.
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How to Open the Trunk When the Key is Locked Inside for Buick Excelle?

Steps to open the trunk when the key is locked inside for Buick Excelle: 1. Press the brake pedal; 2. Start the car; 3. Wait for the dashboard lights to illuminate; 4. Press the electronic trunk release button located on the driver's side; 5. The trunk will then open. Taking the 2010 Buick Excelle XT as an example, it is a compact car with body dimensions of: length 4419mm, width 1814mm, height 1487mm, and a wheelbase of 2685mm, with a trunk capacity of 375 liters. The 2010 Buick Excelle XT features a front MacPherson strut independent suspension and a rear compound torsion beam non-independent suspension. It is equipped with a 1.6L naturally aspirated engine, delivering a maximum horsepower of 121 PS, a maximum power of 89 kW, and a maximum torque of 150 Nm, paired with a 6-speed automatic transmission.
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How to Fix Roewe Fault Code P0700?

Roewe fault code P0700 can be resolved by: 1. Replacing the main relay; 2. Replacing the speed sensor. The fault code indicates a malfunction in the vehicle's main relay, which is the primary power supply relay for the engine control unit (ECU). It provides power to the engine control unit. In some vehicles, the main relay has a delay function, continuing to supply power for a few seconds after the ignition is turned off to allow components like the throttle to return to their initial positions. The speed sensor detects the engine speed, determines the crankshaft's position, and monitors signals for the piston's top dead center and crankshaft angle. These signals are then sent to the ECU to control ignition timing and fuel injection timing.
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What is the solution for BMW 740 air conditioning not cooling?

The solutions for BMW 740 air conditioning not cooling are: 1. Appropriately reduce the refrigerant amount; 2. Check if the condenser pipe has dirt and clean the condenser; 3. Refer to the pressure gauge for judgment and perform system reprocessing; 4. If airflow decreases and system pressure and temperature become unbalanced, clean the evaporator or filter. Taking the 2019 BMW 740Li as an example, its front suspension is a double-wishbone independent suspension, and the rear suspension is a multi-link independent suspension. The 2019 BMW 740Li is equipped with a 2.0T turbocharged engine, with a maximum horsepower of 265PS, a maximum power of 195kW, a maximum torque of 400Nm, and is paired with an 8-speed automatic transmission.
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What is the real fuel consumption of the Buick Encore?

The real fuel consumption of the Buick Encore ranges from 6.8L to 7.3L. The method to turn off the air conditioning in the Buick Encore is: you can rotate the middle knob on the air conditioning control panel to adjust the air output to the 'off' position, or press the AC button to directly turn off the air conditioning. Taking the 2020 Buick Encore as an example, it is a compact SUV with body dimensions of: length 4295mm, width 1798mm, height 1607mm, a wheelbase of 2570mm, a fuel tank capacity of 40L, and a curb weight of 1245kg. The Buick Encore's transmission is from the Aisin brand, and the function of the transmission is to change the gear ratio and expand the torque and speed of the drive wheels.
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What are the dimensions of the A4 in terms of length and width?

The length, width, and height of the Audi A4 are 4762mm, 1847mm, and 1436mm respectively, with a wheelbase of 2828mm. The related introduction of the Audi A4 is as follows: Audi A4 exterior design: Both the Audi A4 Avant and Audi A4 allroad models feature a hexagonal grille design, but with distinct differences in details. The front face design of the Avant model is the same as the current three-box version of the Audi A4L, with blackened treatment on the intake grille and fog light areas, making it more dynamic and vibrant. Audi A4 configuration: The interior design of the new car is very technological, with the enhanced version of the Audi virtual cockpit as standard across the range, equipped with a 12.3-inch full LCD instrument panel, a 10.1-inch central control screen, and the MMI infotainment system, integrating functions such as voice control, touch sound feedback, entertainment, navigation, and car networking, while also supporting Audi-Connect interconnect technology.
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