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What is the normal engine idle speed for a car?

1 Answers
MaxLee
07/30/25 4:25am
Generally, the normal idle speed for a sedan ranges from 700 to 900 RPM. Below is relevant information about car idle speed: 1. Definition: Idle speed refers to the engine operating without any load, only overcoming internal friction resistance without delivering power output. The minimum stable engine speed under these conditions is called idle speed. The idle speed can be adjusted by modifying the throttle opening size, with the optimal idle speed being the lowest RPM at which the engine doesn't vibrate. 2. Idle performance: Car engine idling is one of the engine operating conditions. The idle performance significantly impacts emissions, fuel consumption, and driving comfort. The engine speed during idling is called idle speed, which shouldn't be too high or too low - excessively high idle speed increases fuel consumption, while excessively low speed causes unstable engine operation.
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Is a new car inspected every two years?

New cars are not inspected every two years, but every six years, with the inspection compliance label renewed every two years. The six-year inspection exemption means the vehicle is exempt from on-site inspection, but it does not mean no inspection is required at all. Owners still need to apply for the inspection label at the vehicle management office every two years. The following vehicles are not eligible for the exemption: 1. First type: Vehicles involved in accidents causing casualties are not exempt from inspection. 2. Second type: Vehicles that have not been registered for a long time after purchase (those not registered within four years from the date of manufacture) are not exempt from inspection. 3. Third type: Non-commercial passenger vehicles and similar vehicles that had reached their inspection expiration date before September 1, 2014, but failed to undergo inspection on time, are not eligible for the exemption and must still undergo inspection at designated inspection centers as per the original regulations.
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Why can't the car Bluetooth and mobile phone Bluetooth connect?

The car Bluetooth and mobile phone Bluetooth cannot connect because the pairing relationship has not been established, and reconnection should be attempted. Invisible Bluetooth status, hardware facility malfunctions, excessive distance, and Bluetooth system incompatibility can all cause the car Bluetooth and mobile phone Bluetooth to fail to connect. The following are other situations that may cause the two Bluetooth devices to fail to connect: 1. Invisible Bluetooth status: If either the car Bluetooth or mobile phone Bluetooth is in an invisible state, neither device can scan the other, making connection and pairing operations impossible. 2. Hardware facility malfunctions: Whether it's an issue with the car Bluetooth module or a problem with the mobile phone's Bluetooth function, successful connection cannot be achieved. 3. Excessive distance: The current mobile device has moved out of the communication range of the car Bluetooth, and when the distance is too far, the signal may not be received.
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What are the classifications of road traffic markings?

Here is the classification of road traffic markings by installation method: 1. Longitudinal markings: Longitudinal markings are set along the direction of traffic flow. 2. Transverse markings: Transverse markings are set at an angle to the direction of traffic flow. 3. Other markings: Other markings include character markings or other forms of markings. Here is the classification of road traffic markings by function: 1. Indicative markings: Indicative markings indicate lanes, traffic directions, road edges, sidewalks, and other facilities. 2. Prohibitive markings: Prohibitive markings announce special regulations such as compliance, prohibition, and restrictions in road traffic, which must be strictly followed by drivers and pedestrians. 3. Warning markings: Warning markings alert drivers and pedestrians to special road conditions, enhancing vigilance and preparing them for preventive measures.
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Why is there no sound from the speakers in the two rear doors of the car?

The reason there is no sound from the speakers in the two rear doors of the car is that a two-channel stereo audio source is being played. The two front doors serve as the main channels, while the two rear doors function as surround sound channels. Therefore, the sound from the rear doors is typically quieter. Below is some information about car audio systems: 1. Function: Car audio systems are an important way for drivers to combat fatigue during trips, playing a crucial role in safe driving and overall vehicle safety. 2. Causes of damage: One reason could be that the speakers themselves are damaged and not functioning. Another reason could be poor contact at the steering wheel's clock spring contacts. A third reason could be contact point erosion. A fourth reason could be a blown fuse. A fifth reason could be moisture due to inadequate sealing.
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How to Test Diesel Fuel Quality?

Diesel fuel quality can be tested by observing color, smelling odor, checking impurities, and examining viscosity and foam. Here are some methods for diesel fuel quality testing: 1. Observe color: High-quality vehicle diesel should be a transparent liquid in colorless, light yellow, or light brown, slightly transparent without turbidity; dark black or soy-sauce colored indicates low-grade blended oil; turbid diesel suggests contamination with water or impurities. 2. Smell odor: Premium diesel has a normal fuel smell; inferior diesel may have irritating odors, such as strange or pungent smells from recycled oil. 3. Check impurities: Take a small amount of fuel and filter it through filter paper (or napkin), then observe whether any impurities are filtered out. 4. Examine viscosity and foam: Diesel itself has relatively high viscosity, which increases as temperature drops, meaning diesel has poorer fluidity at low temperatures.
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Is it okay not to buy full coverage insurance for a new car?

It is not mandatory to purchase full coverage insurance for the first year of a new car; you can buy insurance according to your needs. Typically, new cars are insured with full coverage because the combination of a new car and a new driver is prone to accidents. However, when renewing the insurance in the second year, many car owners will choose the insurance items based on their own needs. The following are optional commercial insurance items: 1. Vehicle damage insurance. 2. Third-party liability insurance. 3. Passenger liability insurance. 4. Glass breakage insurance. 5. Scratch insurance. 6. Theft insurance. 7. No-deductible insurance. 8. It is completely unnecessary to buy spontaneous combustion insurance for a new car; it is better to add spontaneous combustion insurance after a few years when the car is older.
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