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What are the reasons when a car is in normal condition but fails to start?

2 Answers
BrielleAnn
07/28/25 11:47pm
Introduction to reasons why a car is in normal condition but fails to start: Battery depletion: When the car battery is depleted, the car will fail to start. There are many reasons for car battery depletion, such as lack of water in the battery, battery malfunction, or prolonged use of the air conditioning. When the car fails to start, the first step is to check whether the car battery has any issues, identify the specific problem, and then send it to a 4S shop for repair. Extremely low temperatures: In cold winter weather, cars often fail to start. This is because in low-temperature environments, the viscosity and rotation speed of the car's engine oil decrease, leading to reduced ignition energy from the battery and decreased molecular activity. As a result, flammable gases cannot form, making it difficult to start the car. Carbon buildup in the car: Carbon buildup in the car engine can cause many problems, with the most common being difficulty in starting the car. There are many reasons for engine carbon buildup, such as excessive water in gasoline, poor fuel quality, or poor sealing of the valve seat ring.
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LaKatherine
08/12/25 4:06am
Recently, I also encountered this situation while driving. On the surface, everything seemed normal, but the car wouldn't start. It could be due to hidden issues like the battery voltage being too low without triggering an alarm, or the starter motor being broken and stuck, preventing it from operating. If the fuel pump is aging, it might also lead to insufficient fuel supply. Although the dashboard shows everything is fine, the fuel line could actually be clogged. I have to remind everyone: last time my car couldn't start on the roadside, I thought it was a minor issue but ended up costing me a lot in repairs. It's best to first try jump-starting the car with another vehicle. If that doesn't work, then check if the relevant fuses in the fuse box are blown. Don't overlook these small details. Regular maintenance, including cleaning battery terminals and replacing old parts, can prevent problems before they occur.
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How Many Car Keys Are There?

When purchasing a new car, you generally receive two keys: one primary key and one spare key. Most modern cars are equipped with remote keys that contain electronic chips. Compared to traditional mechanical key locks, remote keys not only eliminate the need to insert and turn a key to unlock the car, enhancing convenience, but also feature highly complex encryption codes on their internal chips, providing better security. Car keys can be categorized into three types: mechanical keys, remote keys, and smartphone keys. Mechanical keys are the most common type, typically matching door locks similar to household locks, requiring insertion and rotation to unlock or lock. Their main drawback is the inability to remotely start the vehicle, making them unsuitable for certain scenarios, and they have largely been replaced by remote keys. Remote keys operate by emitting weak radio waves to control door opening and closing. Their advantages include remote start capability, greater convenience compared to mechanical keys, and the ability to remotely operate windows, trunk doors, etc. Additionally, remote keys consume less power and have longer battery life. Smartphone keys: Beyond mechanical and remote keys, some car models now utilize vehicle interaction systems, allowing smartphones to pair with the car via official platforms. When the car key is not available, the vehicle can be started or turned off using a smartphone, addressing various unexpected situations with stronger adaptability.
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Can a New Car Go on Long Trips During the Break-in Period?

New cars can go on highways during the break-in period, but there are speed limits. For domestic cars, the speed is generally limited to 40-70 km/h, while for imported cars, it is usually within 80 km/h. The precautions for the break-in period of a new car are as follows: Warm up the car before starting: Wait 5 to 10 seconds after shifting to second gear before starting; Avoid high-speed driving: New cars have speed limits during the break-in period, with domestic cars limited to 40 to 70 km/h and imported cars to 100 km/h; Avoid overloading: Carrying too much weight during the break-in period can damage the mechanical components; Avoid removing the speed limiter too early: The speed limiter is a throttle device installed between the carburetor and the intake pipe. Owners should not remove it prematurely but wait until after driving 1,000 km; Avoid changing oil too early: The initial oil used in a new car is specifically designed for the break-in period, featuring low viscosity, good heat dissipation, and excellent oxidation resistance; Avoid emergency braking: Emergency braking not only shocks the braking system during the break-in period but also increases the impact load on the chassis and engine.
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Is Polishing Necessary Before Car Waxing?

Whether polishing is required before car waxing depends on the condition of the paint. If the vehicle is well-maintained with intact paint gloss and overall good condition, you can proceed with waxing after simply cleaning the surface. Polishing is performed to smooth out minor scratches on the paint surface and address uneven areas caused by oxidation or dirt. Waxing precautions: Car wax should be applied in a shaded area, as high surface temperatures can reduce the wax's adhesion and affect the results. When waxing, use a manual sponge or waxing machine sponge in circular motions to ensure even application and proper bonding with the paint. Follow the top-to-bottom principle—start with the roof, then the front and rear covers, followed by the sides. After application, carefully inspect and remove any residual wax from the license plate, lights, and door edges to maintain aesthetics. If the sponge shows paint color matching the car, this may indicate damaged paint—stop waxing immediately and perform repairs. Adjust waxing frequency based on driving and parking conditions; the typical interval is every 2-4 months. Polishing precautions: During polishing, follow the "first waxed, first polished" principle. The coarseness of the polishing compound depends on the paint's oxidation level. Each polishing session removes a layer of paint, so avoid excessive frequency.
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What are the solutions for high fuel consumption in Peugeot 508?

You can reduce fuel consumption by cleaning engine carbon deposits, checking the oxygen sensor, regularly replacing the three filters, and inspecting the electronic control unit. The combined fuel consumption of the Peugeot 508 is 6.0-6.1L/100km. There are currently 5 models of the Peugeot 508 on sale: the Pioneer Edition and the Drive Fun Edition, with a combined fuel consumption of 6.0L/100km. The Sport Edition, Passion Edition, and Drive Control Edition have a combined fuel consumption of 6.1L/100km. The above figures are the NEDC combined fuel consumption, which is the fuel consumption data measured under the NEDC test procedure. The actual fuel consumption is higher than this value, ranging from 8.0-8.8L/100km. Methods to reduce fuel consumption: Clean engine carbon deposits: Excessive engine carbon deposits are a significant cause, mainly due to the use of unsuitable fuel. It is recommended to add a certain amount of cleaning agent when refueling. If the effect is not obvious, it indicates that there is a considerable amount of carbon deposits in the engine. In this case, the car must be taken to a 4S shop for professional technicians to clean the carbon deposits inside the engine. Check the oxygen sensor: As an internal control unit of the car, the oxygen sensor mainly monitors the fuel-air ratio of the engine. Once it is damaged, it will cause an imbalance in the fuel-air ratio, leading to a sudden increase in fuel consumption. If the oxygen sensor is damaged, the exhaust pipe will emit darker-colored exhaust gas while driving, and the oxygen sensor should be replaced at this time. Regularly replace the three filters: During the use of the vehicle, the oil filter, air filter, and fuel filter must be replaced regularly. If they are not replaced for a long time, they will become dirty and send incorrect information to the engine control unit, resulting in incomplete fuel combustion and increased engine carbon deposits. Check the electronic control unit: Although the engine's electronic control unit is highly reliable, in vehicles that have been used for a long time, various faults may inevitably occur.
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What does 1.6T mean in cars?

1.6T in cars indicates that the engine has a displacement of 1.6 liters, and the T signifies that the vehicle's engine is equipped with a turbocharger, making it a turbocharged engine. The space volume through which the piston moves from the top dead center to the bottom dead center is called the cylinder displacement. If the engine has multiple cylinders, the sum of the working volumes of all cylinders is referred to as the engine displacement, typically measured in liters (L). Engine displacement is one of the most important structural parameters, more representative of engine size than bore and cylinder count, and many engine metrics are closely related to displacement. Generally, micro cars have a displacement of ≤1.0L, compact cars range between 1.0-1.6L, mid-size cars between 1.6-2.5L, executive cars between 2.5-4.0L, and luxury cars have displacements exceeding 4.0L. Turbocharged engines increase the intake air volume through a turbocharger, thereby enhancing the engine's output power and torque. After installing a turbocharger, an engine's maximum power can increase by 40% or more. The biggest advantage is that it can significantly boost the engine's power and torque without increasing the engine displacement. Turbocharged engines are not only more fuel-efficient but also reduce emissions of carbon monoxide, hydrocarbons, and particulates.
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Is it allowed to modify the appearance of the exhaust pipe?

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