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What Causes the Ticking Sound That Disappears After a Cold Start?

1 Answers
DiJohn
09/04/25 2:01am
Cold start noise that disappears is due to the small clearance between the gasoline engine piston and cylinder wall. Specific reasons for cold start noise: Cold start noise occurs because parts are cold and hard, with insufficient lubrication, leading to abnormal sounds. Additionally, when drive wheels slip, avoid sudden acceleration as it can cause planetary gears to seize on their shafts. Impact of cold starts: A cold start refers to starting the engine after it has been off for a while, cooled down significantly below normal operating temperature, with most engine oil having drained back. Over 80% of engine wear occurs during the cold start phase.
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How to Adjust the Seat in Volkswagen Santana?

There are three seat adjustment switches for the driver's seat in Volkswagen Santana: seat forward/backward adjustment, height adjustment, and backrest adjustment, located on the left side of the seat cushion. Additionally, the rear seats of the Volkswagen Santana cannot be folded down. Volkswagen Santana Seat Adjustment: 1. Pull the backrest switch and use your waist strength to adjust the backrest to the desired position, then release the switch. 2. Height adjustment switch: Lift up to raise the seat height, press down to lower the seat height. 3. Forward/backward position adjustment: Pull the lever under the seat and use your hip strength to move the seat to the desired position, then release.
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What is the Crank Connecting Rod Mechanism Composed Of?

The crank connecting rod mechanism is the main mechanism in an engine that converts thermal energy into mechanical energy and vice versa. Its primary function is to transform the force exerted by the gas in the cylinder on the piston into the rotational torque of the crankshaft, thereby outputting power. The crank connecting rod mechanism can be divided into the engine block group, the piston connecting rod group, and the crankshaft flywheel group. Below is an introduction to the components of the crank connecting rod mechanism: 1. The engine block group mainly consists of the cylinder block, cylinder head, and cylinder gasket. 2. The piston connecting rod group mainly consists of the piston, piston rings, piston pin, connecting rod, connecting rod cap, connecting rod bearings, and connecting rod cap bolts. 3. The crankshaft flywheel group mainly consists of the crankshaft, flywheel, and crankshaft bearings.
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What is the reason why the Audi A4L does not shift to 7th gear when the air conditioning is on?

The reason why the Audi A4L does not shift to 7th gear when the air conditioning is on is that 6th gear is at 1500 rpm, while 7th gear is around 1100 rpm. Introduction to the Audi A4L air conditioning system: When driving in Comfort mode most of the time, the car usually remains in 6th gear at speeds over 70 km/h on elevated roads. It will only shift to 7th gear after maintaining a steady speed for a long time. Sometimes, even at 80 km/h, you need to slightly release the accelerator, and it will only shift to 7th gear after maintaining a steady speed for more than 10 seconds. The Audi A4L air conditioning system can achieve zoned control of the cabin space to meet the comfort needs of passengers in different positions. Additionally, it allows adjustments to the air outlet mode and temperature. Selecting the automatic air conditioning mode can maintain the most comfortable and pleasant temperature and air quality in the cabin in real-time. Operation and specific functions of the Audi A4L air conditioning system: Driver's side temperature adjustment, automatic air conditioning mode, rear windshield defrosting, front windshield defrosting, driver's side air outlet mode selection, compressor A/C switch, fan speed switch and adjustment, synchronized temperature zone for rear seats, passenger side air outlet mode selection, switching between internal and external air circulation, air conditioning system switch, passenger side temperature adjustment, and zoned automatic air conditioning mode.
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What is the 0-100 km/h acceleration time of the Aion Y?

The 0-100 km/h acceleration time of the Aion Y is 8.19 seconds. GAC New Energy Aion: The powertrain delivers 135 kW of power, with a peak torque of 350 Nm and 184 horsepower. During full-throttle starts, the front wheels show no slippage, and the lift-off posture is not very noticeable. The initial acceleration offers strong and sustained power output, providing a good acceleration feel, while the mid-to-late stage acceleration gradually weakens. The Aion V exhibits a strong sense of pushback during the initial start, with rapid early-stage acceleration, followed by a reduction in acceleration force. The initial G-force exceeds 0.5g, then stabilizes at 0.4g. When the speed exceeds 60 km/h, the G-force begins to decline, reaching a minimum of 0.2g, which aligns with the physical output characteristics of the electric motor. Aion V 0-100 km/h acceleration: The time is 8.19 seconds, with a 0-60 km/h acceleration time of 3.8 seconds, a 40-80 km/h acceleration time of 3.3 seconds, and an 80-120 km/h acceleration time of 6.1 seconds. These results are slightly faster than those of the Song Pro EV and the Weltmeister EX5-Z.
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What are the maintenance items for the Envision at 40,000 kilometers?

The recommended maintenance items for the Envision at 40,000 kilometers generally include engine oil, oil filter, cabin air filter, engine air filter, fuel filter, throttle body cleaning, and brake pad inspection. Envision Maintenance Schedule: The Envision requires maintenance every 5,000 km, with a warranty period of eight years or 160,000 km. It also includes two free basic maintenance services. The first maintenance is due at three months or 3,000 km, and the second maintenance is also at three months or 3,000 km, whichever comes first. Specific details should be confirmed with the dealership, and it is essential to adhere to the maintenance schedule. It is important to understand the Envision's overall warranty period. According to the maintenance manual, the vehicle warranty is three years or 100,000 km (whichever comes first), calculated from the date of purchase as indicated on the invoice, until the warranty period ends. Under most circumstances, it is recommended to perform the first maintenance within 5,000 km or six months. Notably, the Envision comes with two complimentary oil and oil filter changes, with the same validity period as the warranty. Envision Engine Oil: Using full synthetic oil provides better performance. Brands such as Mobil 1 Silver or Castrol Edge offer excellent engine protection. Both oils are similarly priced. The vehicle requires 5.4 liters of engine oil for a change. Typically, a 4-liter bottle is used, and an additional 1-liter bottle or an additive can be used to make up the difference.
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What is the minimum ground clearance of the Boyue?

The minimum ground clearance of the Boyue is 135mm. Minimum ground clearance refers to the distance between the most protruding part of the chassis and the horizontal ground when the car is fully loaded (allowing maximum load mass), reflecting the car's ability to pass obstacles or uneven ground without collision. The Boyue is a car under Geely, with a length, width, and height of 4519mm, 1831mm, and 1694mm respectively, and a wheelbase of 2670mm. The car is equipped with features such as a 7-inch full LCD 3D dynamic combination instrument panel, NAPPA luxury leather multifunctional steering wheel, EPB electronic parking brake system, and AUTOHOLD automatic parking system.
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