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What Causes Low Idle Speed?

1 Answers
DavidLynn
07/29/25 3:44pm
Low idle speed in a car is caused by low battery voltage. Here is a partial introduction to the effects of low idle speed: 1. Fuel Economy: Since the engine often needs to operate at idle, statistics show that approximately 30% of urban vehicle fuel consumption occurs during idle conditions. Therefore, reducing fuel consumption during idle operation is crucial, which is also a requirement for idle speed control. 2. Emissions: During idle conditions, gasoline engines have a high amount of residual exhaust gas in the cylinders. To ensure stable combustion, the air-fuel mixture needs to be enriched, leading to incomplete combustion and the production of harmful emissions such as CO and HC.
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How Many Gears Does a Car Have?

Cars have 4-8 gears. Here are the specific introductions to the common automatic transmission gears currently: P (Parking Gear): When the car is parked and not in use, the gear is in this position, where the wheels are mechanically locked to prevent rolling. The vehicle must come to a complete stop before engaging the P gear, otherwise the mechanical parts of the automatic transmission may be damaged. R (Reverse Gear): Used for reversing. Unlike manual transmission cars, automatic transmission cars cannot use half-clutch, so special attention should be paid to the control of the accelerator pedal when reversing. Usually, the safety button on the shift lever must be pressed before moving the lever to the "R" gear. Never force the shift to the "R" gear before the vehicle comes to a complete stop, otherwise the transmission may be severely damaged. N (Neutral Gear): Used for temporary stops (such as at a red light). Note that this gear position indicates neutral. To prevent the vehicle from rolling on a slope, the brake must be applied.
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How Far Can a Car Go When the Fuel Gauge Reaches the Red Line?

When the fuel gauge needle reaches the red line, the car's fuel tank typically has about 10% of fuel left, allowing the car to travel an average of 20-60 kilometers further. However, the exact distance depends on the specific car model. Below is the relevant information: Reasons for the fuel gauge warning light: The gasoline fuel gauge indicator light turns on when the fuel level reaches the red zone, usually leaving 15%~20% of the total fuel capacity. The distance you can drive depends on calculations. If the fuel gauge light comes on while driving on a highway, there's no need to panic. The distance between highway service areas is generally around 40 kilometers, with a maximum of 60 kilometers. What to do when the fuel gauge light is on: If the fuel gauge light comes on, stay calm. If you're on a highway, maintain a steady speed—do not brake suddenly or drive too slowly, as low-speed driving also consumes fuel. Control your speed and drive smoothly.
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What are the types and differences of transmissions?

Transmissions can be classified into manual and automatic types. The differences between transmissions lie in their distinct characteristics. Below are the distinctions in terms of their properties: 1. Manual Transmission: The shifting clutch is a wet multi-plate clutch. When hydraulic pressure forces the piston to press the driving and driven plates together, the clutch engages. When the working fluid is discharged from the piston cylinder, the return spring causes the piston to retract, disengaging the clutch. 2. Automatic Transmission: After the engine starts, the crankshaft drives the pump impeller to rotate via the flywheel. The centrifugal force generated by the rotation causes the working fluid between the impeller blades to be flung from the inner edge to the outer edge. Below is additional information about the features of automatic transmissions: 1. Manual Mode: The manual mode can best reflect the driver's intention, allowing them to select gears according to their needs. 2. RPM Shifting: For economical driving, lower RPM shifts can be maintained. 3. Gear Holding: When encountering a steep downhill, the gear can be held in first or second gear.
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Why is the inside of the car windshield blurry?

The blurriness on the inside of the car windshield may be due to fogging. You can use glass cleaner to wipe it clean. The reason it gets blurrier the more you wipe is due to incorrect wiping technique. Hazards of a blurry windshield interior: The biggest issue is when washing the car, especially the inside of the front windshield. Some people find that the more they wipe the inside, the more smeared it becomes. During night driving, when headlights from oncoming vehicles shine on the glass, it can cause glare. This not only affects visibility but could also potentially lead to accidents. Incorrect cleaning methods: There are two possible reasons why the inside of the front windshield gets blurrier when wiped. Either the cleaning method is incorrect, or there's an issue with the windshield film. The proper way to clean the inside of the front windshield is to use glass cleaner. Just like cleaning the exterior, glass cleaner can also be used for the interior. It not only removes dirt but also prevents glare, fogging, and static electricity.
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What Causes the Front Windshield of a Car to Be Unclear?

There are several reasons why the front windshield of a car may become unclear, including dust and spots. Dust: Since cars are often driven outdoors and many parking lots are open-air, it is common for dust to accumulate on the windshield. In such cases, the owner can easily clean it by wiping the surface with a towel first and then washing it with glass cleaner. Regular cleaning can resolve this issue. Spots: Spots usually appear due to rain residue. A routine cleaning process, such as wiping with a towel and then using glass cleaner or toothpaste, can remove them. This method is similar to the one described for dust and is relatively simple. Glass Stains (Glass Etching): If there are glass stains, the situation becomes more troublesome. Sometimes, detergents or dish soap are used, but they may not effectively remove the stains. The correct method involves first wetting a towel, wiping the glass with the damp towel, applying alcohol, and then wiping again. Alternatively, adding ammonia to water can also help remove the stains.
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What is the reason why the hand oil pump does not become hard when pressed?

The hand oil pump not becoming hard when pressed is most likely due to air leakage in the hand oil pump. The high-pressure oil pump requires a power source to operate, with the lower camshaft being driven by the engine crankshaft gear. Material of the oil pump: The oil pump features a housing made of aluminum-containing material and a movable molded part installed within this housing. This movable part is at least partially made of a sinterable, iron-based alloy material containing austenite. Precautions for using the oil pump: During use, it is strictly prohibited to dilute gear oil with diesel or other substances. Also, avoid heating the rear axle or transmission to facilitate winter starting, as this can cause severe deterioration of the gear oil. In such cases, switch to a low-viscosity multi-grade gear oil. Do not confuse the classification labels of engine oil and oil pump. To avoid confusion in standards, higher classification labels are designated for gear oils, while lower ones are used for engine lubricants.
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