What Causes the Horn to Stop Working After Vehicle Wading?

Does Using Higher Octane Gasoline Improve Engine Performance?

Using higher octane gasoline does not necessarily improve a car's performance. The reasons are as follows: 1. The octane rating of gasoline is determined by the ratio of isooctane to n-heptane in the fuel. 2. Isooctane proportion in fuel: Generally, household cars typically use 92 or 95 octane fuel. In 92 octane fuel, isooctane accounts for about 92% of the rating, while n-heptane makes up about 8%. In 95 octane fuel, isooctane accounts for about 95% of the rating, with n-heptane at about 5%. 3. Brief introduction to fuel usage: A higher octane rating indicates better anti-knock performance of the fuel, but it does not mean that it will enhance the car's power. When refueling, it is necessary to choose based on the type of engine, specifically the compression ratio. Normally, naturally aspirated engines require 92 octane gasoline, while turbocharged engines need 95 octane fuel.

16

1

Share

What Causes the Abnormal Noise in Tang DM on Bumpy Roads?

The abnormal noise in Tang DM on bumpy roads can be caused by various reasons, such as loose screws or issues with the steering column. Below is an analysis of the potential causes: 1. Loose related screws: During the test drive, the noise originated from the steering column and steering wheel area, suspected to be transmitted from the chassis to the column. All chassis screws were checked and tightened, with no looseness found. 2. Steering column issue: After removing the main airbag, instrument panel, combination switch, clock spring, and column cover, and only installing the steering wheel for a test drive, the fault persisted. 3. Steering gear problem: Upon removing the related decorative panels near the column, it was discovered that the reserved knee airbag connector of the instrument wiring harness was tightly pressed against the instrument panel body, suspected to cause impact noise when driving on bumpy roads. 4. Interference with related components: After securing the knee airbag connector and its main wiring harness with tape, the test drive confirmed the fault was resolved.

8

0

Share

What invoices should I get when picking up my car after repairs at a 4S shop?

When picking up your car after repairs at a 4S shop, you should obtain a general VAT invoice. General VAT Invoice: A general VAT invoice is issued and managed through the VAT anti-counterfeiting tax control system for general VAT taxpayers, excluding commercial retail. This means general VAT taxpayers can use the same VAT anti-counterfeiting tax control system to issue both special VAT invoices and general VAT invoices. Special VAT Invoice: A special VAT invoice is designed and printed under the supervision of the State Taxation Administration and is only available for general VAT taxpayers. It serves as an important accounting document reflecting economic activities and as legal proof of the seller's tax obligations and the buyer's input tax credits. It is a crucial and decisive legal document in VAT calculation and management, functioning as a tax payment certificate. More importantly, the special VAT invoice links all stages from a product's initial production to final consumption, ensuring tax integrity and demonstrating the role of VAT.

8

3

Share

What is the difference between 5w30 and 5w40 for the Qashqai?

The difference between 5w30 and 5w40 for the Qashqai: 5w40 engine oil has higher viscosity than 5w30. The 'w' in the oil grade represents suitability for winter use. The number before 'w' indicates the oil's low-temperature flow performance, while the number after 'w' represents high-temperature viscosity - smaller numbers indicate lower viscosity, and larger numbers indicate higher viscosity. Engine oil, known as the 'blood' of a car, lubricates, cleans, cools, seals, and reduces friction in the engine. The viscosity standard follows SAE viscosity classification, distinguishing the suitable temperature range for lubricants. The performance standard mainly adopts API classification, differentiating oil performance and quality. The Qashqai is an urban SUV developed by Dongfeng Nissan, designed from the outset to combine multiple functions by incorporating characteristics of both SUVs and sedans. It optimizes and balances exterior design, interior, handling, and comfort to build core product strength, making it a representative model among best-selling SUVs.

7

1

Share

Does the Toyota C-HR automatically lock the doors after exiting the vehicle?

Toyota C-HR does not automatically lock the doors after exiting the vehicle. Below is relevant information about car doors: 1. Opening methods: They are divided into forward-opening doors, reverse-opening doors, and horizontally sliding doors. Forward-opening doors can still be closed by air pressure while the car is moving, making them safer and more convenient for the driver to observe the rear when reversing, hence widely adopted. Reverse-opening doors, if not tightly closed while driving, may be blown open by oncoming airflow, thus used less frequently, generally only to improve entry/exit convenience or for ceremonial purposes. Horizontally sliding doors have the advantage of being able to fully open even when the distance between the car body and obstacles is small. 2. Composition: Car doors generally consist of three parts: the door body, door accessories, and interior trim panels. The door body includes the inner door panel, outer door panel, door window frame, door reinforcement beam, and door reinforcement plate. Door accessories include door hinges, door opening limiters, lock mechanisms, inner and outer handles, door glass, window regulators, and sealing strips.

18

2

Share

How many more years can China V vehicles be driven?

China V vehicles can be driven until they are scrapped or fail the annual inspection. Even after China VI standards are introduced, there will be no impact on the service life of already sold China V vehicles. The implementation of China VI standards is only to regulate automakers, requiring them to produce and sell vehicles that meet the 'China VI' standards. This has little to do with consumers' car purchases and choices. Therefore, there is no difference in the service life between China V and China VI vehicles (or even China IV vehicles). Automobile emission standards: Refer to regulations on the content of harmful gases emitted from vehicle waste, such as CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulates, soot). Implementation sequence: China first implemented the China I emission standard, followed by China II, China III, China IV, China V, and China VI. Each upgrade in emission standards significantly reduces vehicle exhaust emissions. From China I to China V, each upgrade reduces single-vehicle pollution by 30% to 50%.

5

2

Share

What Causes the Horn to Stop Working After Vehicle Wading?

Does Using Higher Octane Gasoline Improve Engine Performance?

What Causes the Abnormal Noise in Tang DM on Bumpy Roads?

What invoices should I get when picking up my car after repairs at a 4S shop?

What is the difference between 5w30 and 5w40 for the Qashqai?

Does the Toyota C-HR automatically lock the doors after exiting the vehicle?

How many more years can China V vehicles be driven?

How to Determine Straight Driving in Subject 3?

What will happen if fuel consumption increases after changing to Castrol engine oil?

Will Points Be Deducted for Collisions Between Right-Turning and Straight-Going Vehicles?

Can I get window tinting at a 4S store?