What does SN or CF in engine oil mean?

Why does the car smell strongly of gasoline after replacing the charcoal canister?

Overfilling the fuel tank causes fuel line leakage. Overfilling the fuel tank: Many people have the habit of overfilling their fuel tanks. They not only fill the tank completely but also repeatedly pull out and reinsert the fuel nozzle after the automatic shutoff, continuing to add fuel until the gasoline level becomes visible at the filler neck. This is the main culprit behind persistent gasoline odors in the car. When the tank is overfilled, gasoline may flow into the charcoal canister through the fuel lines. The charcoal canister is designed to absorb gasoline vapors, but when it becomes saturated with liquid gasoline, it may excessively release gasoline vapors through the ventilation holes, especially when the air conditioning is in fresh air (outside air) circulation mode, making the gasoline smell particularly strong. Fuel line leakage issue: If there's a leak in the fuel line, gasoline odor will naturally enter the cabin through the air conditioning system. Leaks typically occur at pipe connection points, which can be detected during routine inspections. Leaked gasoline will accumulate dust over time, forming thick grease deposits.

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Is it allowed to overtake from the right side on urban roads?

Overtaking from either side is not permitted on urban roads. Under normal circumstances, overtaking should be done from the left side. Road arrangement restrictions: In China's road arrangement, for a single direction, the order from left to right is motor vehicles, motorcycles, bicycles, and pedestrians. Different types of vehicles result in varying levels of congestion on the road. Generally, the left side is less congested. The driver's seat in a car is positioned on the left side. The left rearview mirror is easier to use than the right one, providing a better field of vision, making it more convenient to observe road and traffic conditions, thus ensuring safer overtaking. Correct method for overtaking: Before overtaking, it is essential to observe the condition of the lane you intend to use, the traffic situation in the adjacent lane, and the traffic ahead of the vehicle you plan to overtake. To achieve greater acceleration in the shortest possible time, you should downshift first and then quickly press the accelerator to speed up. The purpose of downshifting to increase speed is because the throttle response is faster in lower gears, allowing for quicker acceleration.

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Can a car pass the annual inspection with the engine warning light on?

A car with the engine warning light illuminated cannot pass the annual inspection. The annual inspection checks whether a vehicle meets the required standards, and if any warning light is on during the inspection, the vehicle will fail. Annual inspection includes: Checking whether the engine, chassis, body, and related equipment are clean, complete, and functional; whether the paint is uniform and aesthetically pleasing; whether major components have been replaced and match the initial inspection records. Testing whether the vehicle's braking performance, steering control, lighting, exhaust emissions, and other safety features comply with the "Technical Conditions for Safe Operation of Motor Vehicles." Verifying whether the vehicle has been modified, altered, or reconstructed; whether the driving license, license plate, and vehicle records match the actual condition of the vehicle; and whether approval and modification procedures have been completed. Checking whether the license plate, driving license, and enlarged license plate markings on the vehicle are damaged, altered, or illegible, and whether they need replacement. For large vehicles, verifying whether the unit name or the street, township, or district name and the maximum seating capacity in the cab are written in standard Chinese font on both sides of the door as required. For trucks, checking whether the rear panel (including the trailer's rear panel) displays the license plate number enlarged 2-3 times as required; for privately owned or jointly operated vehicles, whether the word "Private" is written on both sides of the door. The markings must be clear, and no unit codes or other patterns are allowed (special cases require approval from the vehicle management office).

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What Are the Causes of Insufficient Steering Wheel Power Assistance?

If the power steering pump is damaged, the first noticeable symptom is that the steering becomes very heavy, and there is significant noise from the power steering pump when turning the wheel. Hydraulic Power Assistance Issues: Check if the power steering fluid is insufficient, and ensure there are no oil leaks. If the fluid is low, it needs to be refilled to the normal level. If the fluid level is adequate, inspect whether the power pump belt is too loose. If it is too loose, tighten the belt. Also, check if the oil has become excessively dirty due to poor mobility. Generally, the oil should be replaced every 2 years or 60,000 kilometers. Electronic Power Assistance Issues: Check if the fuse is blown and whether there are any open or short circuits in the wiring. Tire Pressure Issues: Air leakage can also cause the steering to become heavy or unresponsive, requiring inflation.

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What are the hazards of installing car sound insulation cotton?

Installing car sound insulation cotton generally poses no hazards. Noise reduction: Installing sound insulation cotton can reduce the noise generated by the engine. After installation, the high temperature during engine operation also has less impact on the hood, protecting the paint surface and delaying its aging. Distribution of sound insulation cotton: In almost all car models, the four doors cover a very large area, second only to the roof and chassis. During driving, they directly contact with air. In addition to designers creating certain rounded shapes for door panels to reduce wind resistance and noise, car manufacturers also understand that simply increasing the large-area coverage of sound insulation cotton on the inner side of door panels can effectively absorb this wind noise.

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What should be paid attention to when replacing a large turbo?

When replacing a large turbo, the following points should be noted: Ensure the cleanliness of the oil lines: Before installation, ensure that the oil and air pipelines are clean. Make sure the turbocharger's oil inlet and return lines are clean and unobstructed, properly arranged, and not twisted or blocked. There should also be no foreign objects in the turbocharger or the intake and exhaust passages. Use high-quality engine oil: Damage to the turbocharger is usually caused by the failure of the oil seal between it and the intake pipe, leading to significant oil burning. Investigations have found that a large part of oil seal damage is due to the owner not changing the oil on time or using inferior oil, which prevents the floating main rotating shaft of the turbo from being properly lubricated and cooled, resulting in oil seal damage and oil leakage under high temperatures.

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What does SN or CF in engine oil mean?

Why does the car smell strongly of gasoline after replacing the charcoal canister?

Is it allowed to overtake from the right side on urban roads?

Can a car pass the annual inspection with the engine warning light on?

What Are the Causes of Insufficient Steering Wheel Power Assistance?

What are the hazards of installing car sound insulation cotton?

What should be paid attention to when replacing a large turbo?

What Causes the Noise When Turning the Steering Wheel to the Full Lock Position?

Why does the horn have power but the electric start doesn't work?

How to Replace the Battery in a Mondeo Car Key?

What does the KEY indicator on Nissan Teana's dashboard mean?