What is the correct method to check car engine oil?

What are the manifestations of rich and lean mixture ratios?

Phenomena of excessively rich or lean air-fuel mixture are as follows: 1. Lean mixture symptoms: Carburetor backfire, difficult starting, engine overheating, detonation in cylinders, power loss (these symptoms improve when choke is closed), knocking sound during acceleration, unstable idle speed prone to stalling, very white spark plugs. 2. Rich mixture symptoms: Black smoke exhaust with possible oil droplets, engine overheating, insufficient power, unstable operation, increased fuel consumption, muffled engine sound, weak acceleration, unstable idle speed, severely blackened and carbon-fouled spark plugs. 3. Rich mixture: When the excess air coefficient is between 0.85-0.95, flame propagation speed reaches maximum, enabling fastest combustion that achieves peak cylinder pressure and temperature in shortest time with minimal heat loss, producing maximum work output. Since slightly more fuel is supplied than required for complete combustion at fixed air volume, oxygen utilization improves, increasing combustion product molecules and gas pressure - thus enabling the engine to deliver maximum power. This mixture is called the maximum power mixture.

19

0

Share

What Causes Wet Spark Plugs?

Reasons for wet spark plugs: ignition system failure, incomplete combustion. Methods to determine if a spark plug is damaged: Remove the spark plug and observe its condition based on the following appearance colors. A normal spark plug has an insulator skirt and electrodes that appear gray-white, gray-yellow, or light brown. A properly functioning spark plug has a reddish-brown insulator skirt, with an electrode gap between 0.8-0.9mm and no signs of electrode burn. If the spark plug is covered in oil or deposits but is not damaged, it can continue to be used after cleaning off the oil and deposits. If the spark plug is severely damaged, with signs such as blistering at the top, black streaks, cracks, or melted electrodes, the cause of the damage should be identified. After troubleshooting, replace the spark plug with a new one. Additionally, if the spark plug appears black as if smoked, it indicates the wrong heat range was selected, the air-fuel mixture is too rich, or there is oil leakage.

17

5

Share

Where to Apply for Driver's License Renewal?

Driver's license renewal is processed at the vehicle management office. Below are important notes for expired driver's licenses: 1. Legal provisions: According to the Road Traffic Safety Law, if the license is not renewed for more than one year after expiration, the motor vehicle driver's license will be automatically revoked; if it exceeds two years, the normal use of the license can be restored after passing the subject one exam; if revoked for more than two years, you need to reapply. 2. Invalid license: It is particularly important to note that you must not drive a motor vehicle after your driver's license has expired. Driving with an expired license is considered driving without a license or as unlicensed driving. Penalties for driving a motor vehicle include fines and possibly detention for up to 15 days. In the event of serious traffic accidents resulting in personal injury or death, criminal liability will be pursued according to the law.

13

2

Share

What are the effects of chain elongation?

The symptoms of timing chain elongation include: engine vibration and incorrect ignition timing. Below is an introduction to the engine: 1. Introduction: An engine is a machine that converts other forms of energy into mechanical energy. The first external combustion engine was invented by R. Stirling in the UK (Scotland) in 1816 and later improved by Watt into the steam engine. 2. Displacement: Let's first look at one of the most common engine parameters—engine displacement. Engine displacement is the total volume of all the cylinders in the engine, usually measured in liters (L). 3. Classification: Engines can refer to both power generation devices and the entire machine including the power unit (e.g., gasoline engines, aircraft engines). Types include internal combustion engines (such as gasoline engines), external combustion engines (such as Stirling engines, steam engines), gas turbines (used in racing cars), and electric motors.

11

0

Share

Is a Coolant Temperature of 102 Degrees Normal?

Coolant temperature of 102 degrees is normal. Below is an introduction about coolant: 1. Introduction: Coolant, the full name should be antifreeze coolant, meaning it has antifreeze functionality. Antifreeze prevents the coolant from freezing and expanding in cold seasons when the vehicle is parked, which could crack the radiator and damage the engine cylinder block. However, it's important to correct a misconception: antifreeze is not just for winter use; it should be used year-round. In regular vehicle maintenance, the engine antifreeze should be replaced every year. 2. Composition: Coolant consists of three parts: water, antifreeze, and additives. Depending on the antifreeze component, it can be classified into alcohol-based, glycerol-based, ethylene glycol-based, and other types of coolant. 3. Function: To prevent the coolant from freezing and causing the radiator or engine block to crack after the vehicle is parked in winter, the freezing point of the coolant should be about 10°C lower than the lowest temperature in the region, in case of sudden weather changes.

3

Share

What is the actual fuel consumption of the Xingyue L 2.0t?

The comprehensive fuel consumption of the Xingyue L 2.0t is 6.8-7.8L/100km. There are a total of 7 models of the Xingyue L 2.0t currently on sale. The two-wheel drive luxury model, two-wheel drive flagship model, two-wheel drive premium model, four-wheel drive flagship model, and four-wheel drive premium model have a comprehensive fuel consumption of 6.8L/100km. The two-wheel drive intelligent premium model and two-wheel drive comfort model have a comprehensive fuel consumption of 7.8L/100km. The above figures are the NEDC comprehensive 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 8.0-10.4L/100km. The level of a car's fuel consumption is directly related to five major factors: driving habits, the car itself, road conditions, natural wind, and environmental temperature. Specific factors that can increase a car's fuel consumption are as follows: Driving habits: Aggressive driving, such as sudden acceleration, frequent overtaking, and not easing off the throttle before encountering a red light, can increase fuel consumption. The car itself: Cars with larger engine displacements generally consume more fuel than those with smaller displacements because larger displacements usually mean higher power, requiring more gasoline to burn and perform work. Cars with greater weight also consume more fuel because greater weight requires larger driving torque. Road conditions: Driving on dirt roads, muddy roads, soft surfaces, or mountainous roads increases resistance and fuel consumption. Natural wind: Driving against the wind or on windy days increases the car's resistance and fuel consumption. Low environmental temperatures: When the engine block temperature is low, the gasoline injected during a cold start does not atomize easily, requiring more gasoline to be injected for combustion, which increases fuel consumption. Additionally, at low temperatures, the engine's computer will control the engine to run at higher RPMs to warm up, which also increases fuel consumption.

14

3

Share

What is the correct method to check car engine oil?

What are the manifestations of rich and lean mixture ratios?

What Causes Wet Spark Plugs?

Where to Apply for Driver's License Renewal?

What are the effects of chain elongation?

Is a Coolant Temperature of 102 Degrees Normal?

What is the actual fuel consumption of the Xingyue L 2.0t?

Where is the OBD port on a Haval?

Will Insurance Cover a Leaking Oil Pan?

What Does Motor Vehicle Damage Insurance Cover?

Does replacing the headlight assembly count as a damaged vehicle?