How to Use Car Air Recirculation and Fresh Air Mode

How to Check if the Throttle Body Needs Cleaning?

Acceleration is slow, idle speed is unstable, and power decreases. These fault phenomena indicate that the throttle body is too dirty and needs cleaning. Here are the methods to determine if the throttle body needs cleaning: 1. When the tachometer is unstable at idle speed, fluctuating up and down, it means the throttle body is too dirty and requires cleaning. 2. For any fuel-injected vehicle, when the engine is under no load, in neutral, rev the throttle to 3000 RPM and then suddenly release it. Observe the tachometer needle: if it quickly drops to 1000-1200 RPM, pauses slightly, and then drops to around 800 RPM in a fast and direct manner, it indicates the throttle body is slightly dirty but still does not need cleaning. If the needle drops quickly and directly below 800 RPM or even 700 RPM, then slowly rises back to around 800 RPM, with the idle speed fluctuating from low to high, it means the throttle body is severely dirty and requires immediate cleaning.

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What Causes Normal Low Pressure but Low High Pressure in a Car's Air Conditioning System?

Normal low pressure but low high pressure in a car's air conditioning system is caused by a malfunction or damage to the air conditioning compressor. This type of fault generally requires replacing the compressor with a new one. In a vapor-compression refrigeration system, the compressor is one of the main components. Its role is to pressurize gaseous refrigerant and then send it to the condenser for cooling and condensation. Below are the main reasons that can lead to compressor damage: 1. The air conditioning system is unclean, with particulate impurities being sucked into the compressor. 2. Excessive refrigerant or lubricating oil in the system, causing "liquid slugging" and damaging the compressor. 3. The compressor operates at excessively high temperatures or for too long. 4. The compressor lacks oil, leading to severe wear. 5. The compressor's electromagnetic clutch slips, causing excessive friction and high temperatures. 6. The compressor's power configuration is too small. 7. The compressor has manufacturing quality defects.

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What Are the Reasons for Engine Oil Loss in a Car?

The reasons for engine oil loss in a car: 1. Damage to the engine's turbo system, which can consume a large amount of oil. 2. Failure of the engine's cylinder head gasket. 3. Damage to the engine's piston rings. 4. Impact on the oil pan leading to oil leakage. Oil shortage is a serious issue; if not repaired promptly, it can cause the engine to be scrapped. Below are some related preventive measures: 1. Use high-quality engine oil. Engine oil is highly susceptible to corrosion and aging under prolonged high temperatures, causing the oil film to thin and making it easier to enter the combustion chamber and participate in combustion. Therefore, using high-quality engine oil can significantly delay this phenomenon. 2. Pay attention to the cleanliness of the fuel system. During the combustion process, fuel inevitably produces carbon deposits, which are the root cause of some car problems, such as aging of valve seals and increased piston-cylinder wall clearance. These issues are directly or indirectly related to carbon deposits. Therefore, maintaining the cleanliness of the fuel system is very helpful in preventing oil burning.

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The Purpose of the L Gear

The L gear in a car stands for L—Low, which is the low-speed gear. It primarily serves the following purposes: 1. When the car is going downhill, it uses the engine's power for braking, so the driver doesn't have to press the brake pedal for a long time, which could overheat the brake pads and pose a danger. 2. This gear keeps the transmission in 1st gear without shifting up, making it suitable for use on slopes and similar situations. Generally, automatic transmission cars have six gear positions, arranged from top to bottom as follows: P, R, N, D, 2, and L. P: Parking gear. When you park and are not using the car, the gear is in this position, where the wheels are mechanically locked to prevent rolling. R: Reverse gear, used for reversing. N: Neutral gear. Used for temporary stops (e.g., at a red light). D: Drive gear, also known as the forward gear. As the name suggests, this gear is used when moving forward.

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What are the methods for checking car electrical leakage?

There are two methods to detect whether a car has electrical leakage: one is the current detection method, and the other is the empirical detection method. Below are the introductions to these methods: 1. Current Detection Method: Turn off the ignition switch, remove the negative terminal of the battery, set the digital multimeter to the ammeter (1A range), and then take two wires. Connect one end of each wire to the positive and negative probes of the multimeter, and the other end to the negative terminal post and the negative wire, respectively. Observe the ammeter reading. Compare the measured current value with the maintenance data to see if it is within the normal range. If the measured current value is too high, it indicates that the vehicle has an electrical leakage fault. The troubleshooting method involves pulling out each fuse one by one and observing the pointer changes. When removing a certain fuse causes the pointer to stop moving, the fault point is in the circuit or appliance connected to that fuse. Similar to the current detection method, by consulting the circuit diagram or checking the wiring direction, trace the line to find the damaged part for repair. 2. Empirical Detection Method: Turn off the ignition switch, remove the negative terminal of the battery, and then touch the wire to the negative terminal post of the battery, observing the strength of the spark. The stronger the spark, the more severe the electrical leakage phenomenon.

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Does Insurance Cover Spontaneous Combustion of Sedans?

Insurance can cover the spontaneous combustion of sedans under the following three conditions: 1. The spontaneous combustion loss insurance is an additional coverage to the vehicle damage insurance, and only vehicles insured with vehicle damage insurance are eligible for this coverage. 2. For insured motor vehicles, if the loss is caused by spontaneous combustion due to faults in the vehicle's electrical system, wiring, fuel supply system, or the nature of the cargo being transported, the insurance company will compensate for the loss of the insured vehicle within the coverage limit specified in the policy. Additionally, necessary and reasonable rescue expenses incurred by the policyholder to minimize vehicle loss during such incidents will also be covered. In case of total loss, compensation will be based on the actual value of the vehicle at the time of the incident, within the coverage limit specified in the policy. The absolute deductible rate for this coverage is 20%. 3. The insurance company will not cover losses caused by violations of vehicle safety operation rules, such as manual direct fuel supply or open flame baking, or if the spontaneous combustion only results in damage to the electrical system, wiring, fuel supply system, or the cargo itself. Losses caused intentionally by the policyholder are also not covered.

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How to Use Car Air Recirculation and Fresh Air Mode

How to Check if the Throttle Body Needs Cleaning?

What Causes Normal Low Pressure but Low High Pressure in a Car's Air Conditioning System?

What Are the Reasons for Engine Oil Loss in a Car?

The Purpose of the L Gear

What are the methods for checking car electrical leakage?

Does Insurance Cover Spontaneous Combustion of Sedans?

What Causes Engine Shaking After Car Shutdown?

What Causes Abnormal Noise from the Accelerator Pedal?

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