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What Causes the Noise When Starting an Automatic Transmission Car?

2 Answers

LaFrank

08/30/25 7:16am

Automatic transmission car starting noise may be caused by brake pads in the break-in period, particles such as gravel entering the car interior, or improper driving. The following is a detailed introduction about automatic transmission cars: Overview: Automatic transmission cars generally refer to vehicles that use an automatic transmission (AT) to adjust speed. While driving, the control system of the automatic transmission automatically selects the appropriate gear based on the engine speed and load, replacing the driver's subjective judgment of timing and gear shifting operations. Others: Automatic transmission cars usually use a hydraulic transmission device to replace the mechanical clutch of manual transmission cars, so there is no clutch pedal. When the engine speed is low, the torque transmitted by the fluid is limited and insufficient to propel the car forward.

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MacVincent

09/12/25 4:16am

I've been driving automatic transmission cars for over 20 years and often encounter strange noises during startup. Common causes include: wear and tear on the transmission torque converter or internal component damage, leading to unstable oil pressure that produces friction sounds or clicking noises when the engine starts; rust or foreign objects in the brake system, such as rusted brake discs after parking, causing sharp grinding sounds during initial movement; aging and loosening of suspension bushings, resulting in rattling vibrations; abnormal drive shaft clearance or differential issues, noticeable during low-speed rotation. I recommend first testing the startup method on a safe, flat road—gently pressing the accelerator to accelerate slowly—to see if the noise disappears. If it persists, don't delay; immediately visit a professional shop to check the transmission fluid level. Replacing the fluid might solve minor issues. A major repair could cost thousands, but ignoring the problem could lead to accidents. Safety is paramount when driving, so never skimp on these inspection costs.

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What brand is nldsp spark plug?

Nanjing Leidian. Company Introduction: Nanjing Leidian Auto Parts Co., Ltd. is a professional manufacturing enterprise integrating R&D, production, and sales. The spark plugs produced by the company are mainly suitable for various automobile and motorcycle engines as well as small garden gasoline machinery that use fuels such as gasoline, natural gas, and liquefied petroleum gas. Production Line: The company has introduced twelve fully automated spark plug processing production lines from Germany's Robert Bosch Company, possessing excellent production techniques. The product quality and production technology have reached world-class levels. Sales: Leidian spark plug products cover nearly thirty provinces, cities, and autonomous regions in China, with hundreds of brand stores and agencies established. The products are exported to Europe, America, the Middle East, Southeast Asia, Hong Kong, Macau, Taiwan, and other countries and regions. In 2013, the export volume exceeded 300 million units. Under the company's strict requirements and the joint efforts of Leidian employees, the production and sales of Leidian spark plugs have achieved a 40% annual increase for five consecutive years.

What does R-dynamic mean in cars?

R-dynamic refers to the sport package version. Vehicle Introduction: The engine and transmission tuning of R-dynamic models are the same as the standard versions, but they feature additional sporty exterior kits that make the car look more athletic. In contrast, the standard versions appear less aggressive and more business-oriented. In fact, brands like Mercedes-Benz, BMW, and Audi often offer two completely different styling packages for the same car model, giving consumers more choices. Occurrence of R-dynamic: R-dynamic badges are typically found only on the Jaguar XEL and F-TYPE models, but not all XELs necessarily come with the R-dynamic package.

How Many Years Until a Motor Vehicle is Scrapped?

Private vehicles and commercial vehicles have different scrapping periods, as detailed below: Private Vehicle Scrapping Regulations: For 5-seat family cars and 7-seat SUVs, as well as non-commercial small and mini vehicles, there is no usage period limit. However, when the mileage reaches 600,000 kilometers, the state will recommend scrapping. In addition to the above, small and mini non-commercial passenger vehicles, large non-commercial cars, and wheeled special machinery vehicles also have no usage period restrictions. Common Commercial Vehicle Scrapping Regulations: Small and mini taxi passenger vehicles have a scrapping period of 8 years, medium-sized taxi passenger vehicles 10 years, and large taxi passenger vehicles 12 years. Public transport passenger vehicles have a scrapping period of 13 years, other small and mini commercial passenger vehicles 10 years, and large and medium-sized commercial passenger vehicles 15 years. Mini commercial trucks have a scrapping period of 8 years, while light and large commercial trucks have a scrapping period of 10 years.

Where is the frame number located on the Wuxing Zuanbao electric vehicle?

The frame number of the Wuxing Zuanbao electric vehicle is generally located slightly above the pedal. Introduction to the frame number: The frame number, also known as the Vehicle Identification Number (VIN), is a unique code assigned by the manufacturer to identify a vehicle. The VIN is a 17-character alphanumeric code, also referred to as the 17-digit identification code, frame number, or 17-digit number. Composition of the frame number: The Vehicle Identification Code is determined according to national vehicle management standards and contains information such as the vehicle manufacturer, year, model, body type and code, engine code, and assembly location. New vehicle registration certificates usually print the VIN code in the "frame number" column.

Piaggio Engine Lifespan?

Zongshen Piaggio offers a two-year or 20,000-kilometer warranty for the entire vehicle, and a three-year or 10,000-kilometer warranty for the engine. However, there may be differences for vehicles from different periods, so the standard at the time of purchase shall prevail. Below are the detailed descriptions: 3 Major Issues: This Piaggio engine has 3 major issues when new: loud noise, strong vibration, and high fuel consumption. Some owners don't want to drive it after just a few hundred kilometers. High Fuel Consumption During Break-in Period: When the vehicle is new, removing the spark plug and turning the magneto reveals that it is very tight. For a typical GY6 engine, turning it after removing the spark plug doesn't encounter much resistance. Therefore, this new vehicle consumes a significant amount of fuel. Secondly, the choice of engine oil is crucial as this engine is very sensitive to oil viscosity. Using the original 5W-40 oil or Shell Helix 5W-40 oil can basically keep the fuel consumption at around 3.6 liters per 100 kilometers.

What engine does the new Santana have?

The new Santana is equipped with an engine developed by the Volkswagen Group and produced by FAW-Volkswagen Engine (Chengdu) Co., Ltd. The engine model of the new Santana is EA211, with a maximum power of 82kw, a maximum torque of 145 Nm, and a maximum horsepower of 112Ps. Here are some daily maintenance methods for the new Santana's engine: Use lubricating oil of appropriate quality grade. For gasoline engines, SD--SF grade gasoline engine oil should be selected based on the additional devices of the intake and exhaust systems and usage conditions; for diesel engines, CB--CD grade diesel engine oil should be selected according to mechanical load, with the selection standard not lower than the manufacturer's requirements. Regularly change the engine oil and filter. The quality of any grade of lubricating oil will change during use. After a certain mileage, the performance deteriorates, causing various problems for the engine. To avoid failures, change the oil regularly based on usage conditions and keep the oil level moderate. When oil passes through the fine holes of the filter, solid particles and viscous substances in the oil accumulate in the filter. If the filter is blocked and oil cannot pass through the filter element, the filter element may burst or the safety valve may open, allowing oil to bypass through the bypass valve, bringing dirt back to the lubrication area, accelerating engine wear and internal contamination. Regularly clean the crankcase. During engine operation, high-pressure unburned gases, acids, moisture, sulfur, and nitrogen oxides from the combustion chamber enter the crankcase through the gap between the piston rings and cylinder walls, mixing with metal powder from part wear to form sludge. A small amount remains suspended in the oil, while a large amount precipitates, blocking the filter and oil holes, making engine lubrication difficult and causing wear. Regularly use radiator cleaner to clean the radiator. Removing rust and scale not only ensures the engine works properly but also extends the overall lifespan of the radiator and engine.

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