What Causes Cadillac's Low-Speed Jerking?

What are 95 and 98 gasoline?

95 and 98 are both octane ratings for gasoline. 95-octane gasoline is composed of 95% isooctane and 3% n-heptane. When the engine compression ratio is high, high-octane gasoline should be used. If low-octane gasoline is used with a high compression ratio, it can cause abnormal combustion, resulting in knocking, increased fuel consumption, and reduced driving power. 98-octane gasoline refers to gasoline with an octane rating equal to a mixture of 98% isooctane and a certain percentage of n-heptane. 98-octane gasoline has better anti-knock properties and higher power output, while also producing fewer harmful substances and lower exhaust emissions. Different octane ratings indicate different levels of octane values, with higher-rated gasoline having higher octane values and better stability. The differences in gasoline octane ratings: The higher the octane rating, the better the anti-knock performance. Anti-knock performance refers to the gasoline's ability to resist knocking during engine combustion. When refueling, different gasoline grades should be selected based on the engine's compression ratio (the ratio of the cylinder's maximum volume at bottom dead center to its minimum volume at top dead center). Long-term effects of using the wrong gasoline octane rating: Using a higher octane gasoline in a vehicle designed for lower octane will not cause damage, but the increased octane value can alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency. Conversely, using lower octane gasoline in a high-octane vehicle can cause engine knocking, increased resistance during the upward stroke, and abnormal wear on pistons and cylinders, potentially leading to severe engine damage. Refueling precautions: When refueling: Turn off the engine, avoid making phone calls or using mobile devices, and do not use open flames in the gas station. Always turn off the engine while refueling. If there is a queue, wait in line orderly without cutting in. Selecting gasoline: Always choose reputable gas stations with high-quality fuel. Avoid gas stations with poor-quality gasoline. Long-term use of low-quality gasoline can lead to increased carbon deposits in the engine. It's essential to select both a reputable gas station and the correct gasoline octane rating. Choosing the right gasoline octane rating is crucial. Most vehicles have the manufacturer's recommended gasoline octane rating printed inside the fuel filler cap. Follow this recommendation when refueling. If the label states: "Use 92 or higher octane gasoline," then either 92 or 95 octane can be used, but they should not be mixed. If the label states: "Use no less than 95 octane gasoline," then only 95 or 98 octane gasoline should be used, and 92 octane must be avoided. Higher octane gasoline is not always better; the engine's compression ratio must match the gasoline octane rating. Using higher octane gasoline in a low-compression engine may reduce knocking but can alter the ignition timing, leading to increased carbon deposits in the cylinders. Long-term use can negatively impact the engine's lifespan. Using lower octane gasoline in a high-compression engine can cause knocking, accelerating wear and tear on engine components.

16

4

Share

Where is the Wuling Hongguang van's radiator located?

The radiator of the Wuling Hongguang van is located inside the engine compartment. The car radiator refers to the car's cooling system component. Taking the 2020 Wuling Hongguang as an example, its body dimensions are: length 4390mm, width 1660mm, height 1750mm, with a wheelbase of 2720mm and a fuel tank capacity of 50 liters. The 2020 Wuling Hongguang is equipped with a 1.2L naturally aspirated engine, delivering a maximum power of 56kW and a maximum torque of 110Nm, paired with a 5-speed manual transmission. It features a MacPherson strut front suspension and a leaf spring rear suspension.

17

1

Share

How to Reset the Maintenance Light on a Bora?

To reset the maintenance light on a Bora, follow these steps: 1. Press and hold the wrench button, then turn on the ignition. 2. Release the wrench button and press the minute adjustment button on the time setting. 3. Turn off the ignition, release the time button, and then turn on the ignition again or start the engine to complete the maintenance light reset. Taking the Bora 2021 model as an example, its body dimensions are: length 4663mm, width 1815mm, height 1462mm, wheelbase 2688mm, minimum ground clearance 126mm, fuel tank capacity 50l, trunk capacity 506l, and curb weight 1320kg.

3

5

Share

Why is the car air conditioning not cold enough?

Car air conditioning not being cold enough can be caused by: 1. Lack of refrigerant (Freon); 2. Dirty evaporator core; 3. Malfunction in the air conditioning system; 4. Excessive impurities in the refrigerant or refrigeration oil, leading to clogging; 5. Dirty condenser, reducing heat dissipation capacity; 6. Dirty, odorous, or clogged air filter. Methods to check why the car air conditioning is not cold enough include: 1. Checking if the compressor is working properly; 2. Inspecting the refrigerant lines for leaks or damage; 3. Checking the refrigerant level; 4. Cleaning or replacing the air filter. Car air conditioning refers to: The air conditioning device installed in a car, whose functions are: 1. Cooling, heating, ventilating, and purifying the air inside the cabin; 2. Providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety.

1

0

Share

Can You Still Drive with ABS System Failure?

When the ABS warning light is on, it is recommended not to continue driving because the illuminated ABS light indicates a malfunction in the vehicle's anti-lock braking system. During emergency braking, if the wheels lock up, the vehicle may skid uncontrollably, making it difficult for the driver to decelerate or adjust the vehicle's trajectory, posing significant safety risks. There are various states of the ABS warning light, each with different causes and solutions, as detailed below: State 1: ABS warning light stays on (most common). Cause 1: The ABS wheel speed sensor's sensing part is covered by dirt, mud, or other contaminants, affecting the sensor's ability to detect the corresponding speed signal. This prevents the ABS computer from determining the vehicle's speed and the wheel's slip rate, thus failing to issue appropriate commands to regulate braking. Solution: Clean the dirt from the wheel speed sensor and adjust the gap between the sensor and the signal ring to restore normal function. Cause 2: Poor signal due to loose connections in the system wiring or poor contact of the ABS relay, leading to system failure. Solution: Check the wiring connections and reconnect any loose parts. State 2: ABS warning light intermittently illuminates but turns off when accelerating. Cause: When multiple vehicle electrical devices are in use, the battery voltage drops below 10.5V. As the engine speed increases, the voltage rises, and the ABS warning light turns off. This may also occur if the ABS system's power supply voltage is too low due to poor terminal contact or grounding issues. Solution: Check the battery's specific gravity, inspect the charging system, and examine the power supply (e.g., voltage relay or poor power contact). State 3: ABS warning light stays on after engine start and only turns off when the engine is turned off (IGFF). Cause: Poor grounding contact in the ABS hydraulic valve body, loose wiring connections in the ABS hydraulic valve body, or ABS computer malfunction. Solution: Loosen and retighten the grounding screws on the hydraulic valve body, clean the contact surfaces if necessary, check for enlarged gaps in the connectors, and replace the ABS or ABS/ASR computer if needed. State 4: ABS warning light illuminates during high-speed driving. Cause: During high-speed driving, the ABS computer detects a significant discrepancy between the rear and front wheel speed signals, or incorrect tire or wheel rim specifications. Solution: Refer to the vehicle's tire and wheel rim specifications, as indicated on the label near the fuel tank cap. State 5: ABS warning light intermittently illuminates. Cause: Improper adjustment of the brake light switch or poor internal contact in the brake light. Solution: Start the engine, press the brake pedal, push the brake switch linkage down fully with your fingers, then release the brake pedal to complete the self-setting position. Replace the brake light switch if necessary.

8

4

Share

Where is the windshield wiper switch located in the car?

The windshield wiper switch is positioned on the right-hand stalk behind the steering wheel. Activating the wipers simply requires moving this stalk. The removal process for wipers involves: 1. Fully extending the wiper arm and adjusting the blade angle; 2. Positioning the wiper blade at a 90-degree angle to the wiper arm; 3. Aligning it properly, lifting the rubber blade to detach it entirely, then separating the rubber blade horizontally before pressing down on the main bracket. Windshield wipers are crucial attachments installed on the windshield, serving to clear rain, snow, and dust that obstruct visibility—playing a vital role in driving safety.

19

0

Share

What Causes Cadillac's Low-Speed Jerking?

What are 95 and 98 gasoline?

Where is the Wuling Hongguang van's radiator located?

How to Reset the Maintenance Light on a Bora?

Why is the car air conditioning not cold enough?

Can You Still Drive with ABS System Failure?

Where is the windshield wiper switch located in the car?

What car has a vertical bar as its logo?

Where is the charcoal canister located in a car?

What does the vehicle inspection validity period refer to?

Does a newly added battery water in a car need to be charged?