What Causes the Unusual Noise at the Moment of Successful Ignition?

1 Answers
Ramos
07/30/25 9:29am
Here are the main reasons for an unusual noise at the moment of successful ignition in a car: 1. Incorrect gear shifting and clutch operation: The gear is engaged, and the clutch is not fully depressed. 2. Starter motor slipping: The car's starter motor slips at the moment of ignition. 3. Prolonged ignition time: Extended ignition time causes the flywheel to hit the starter gear upon successful ignition. 4. Belt slipping: During ignition, belt slipping may also cause vehicle noise, but this usually disappears once the engine belt speed stabilizes. Note: It is recommended to have the above issues checked at a repair shop as soon as possible to avoid affecting the vehicle's lifespan.
Was this review help?
7
3
Share
More Forum Discussions

What Does Vehicle Damage Insurance Cover?

Vehicle damage insurance covers: 1. Vehicle collision: If the vehicle is damaged due to a collision with external objects while the owner is driving, the costs can be reimbursed. However, violations of traffic regulations such as drunk driving or driving without a license are not covered. 2. Unavoidable natural disasters: For example, damage caused by lightning, storms, tornadoes, heavy rain, floods, tsunamis, cliff collapses, avalanches, hailstorms, mudslides, or landslides. 3. Fire and explosions. 4. Damage caused by external factors: Such as falling trees or building collapses. Vehicle damage insurance is a type of commercial auto insurance that stipulates that the insurance company should compensate within a reasonable range when the insured or an authorized driver causes damage to the insured vehicle during an accident while driving.
4
5
Share

What to do if 92 gasoline is added to a 95 tank?

If the car should use 95 gasoline but 92 gasoline is added, in principle, using a lower octane rating gasoline in small amounts will not cause major problems to the engine, but it may affect the car's performance. Precautions for adding gasoline: 1. When using gasoline, avoid mixing it with kerosene or diesel. Doing so will increase knocking, severely damage the engine's lubrication, and shorten the engine's lifespan. 2. Do not use gasoline that has been stored for a long time and has deteriorated, as using deteriorated gasoline can cause severe engine gumming and carbon deposits. 3. Avoid direct sunlight and regularly clean the fuel tank and gasoline filter.
9
1
Share

What is the function of an automotive expansion valve?

Expansion valves are installed at the inlet of the evaporator and are commonly referred to as expansion valves. They serve two main functions: 1. Throttling effect: High-temperature, high-pressure liquid refrigerant is throttled through the expansion valve's orifice, becoming a low-temperature, low-pressure mist-like hydraulic refrigerant, creating conditions for the refrigerant's evaporation; 2. Controlling the flow of refrigerant: Once the liquid refrigerant enters the evaporator, it evaporates into a gaseous state, absorbing heat and lowering the temperature inside the vehicle. The expansion valve controls the flow of refrigerant to ensure that the outlet of the evaporator is entirely gaseous refrigerant. If the flow is too high, the outlet may contain liquid refrigerant, which could enter the compressor and cause liquid slugging; if the refrigerant flow is too low, it may evaporate prematurely, resulting in insufficient cooling.
11
3
Share

How to Adjust Idle Speed?

Idle speed adjustment steps are as follows: 1. First, check the current idle speed in RPM and note its position. 2. Locate the hood release switch at the bottom left corner and open the engine hood. 3. Find the idle speed adjustment point. If unsure, trace from the air filter - the throttle cable connection near the air filter pipe joint is the idle speed adjustment point. 4. Prepare two wrenches to loosen/tighten. Tighten the idle cable slightly if RPM is too low, or lengthen it if RPM is too high. Relevant information about car idle speed: 1. Some idle systems use different tools. Essentially, locate the idle cable and adjustment screws (which have tightening mechanisms), and remember to secure them after adjustment. 2. After adjustment, verify the tachometer shows about 1000 RPM and check for normal engine operation without vibration.
15
2
Share

What Are the Main Components of Automotive Antifreeze?

Antifreeze is mainly composed of 50% pure water, 40% methanol, and 10% other substances. Functions of Antifreeze: Antifreeze is a coolant containing special additives, primarily used in liquid-cooled engine cooling systems. It offers excellent performance in preventing freezing in winter, boiling in summer, and resisting scale and corrosion year-round. Antifreeze Replacement Cycle: For vehicles that operate for long periods, such as taxis, high-quality antifreeze should generally be replaced annually. For vehicles with shorter operating times, replacement can be done every two years or every 30,000 kilometers. To avoid excessive foam formation, which reduces the heat exchange efficiency between the antifreeze and engine components, ensure the product is within its validity period when adding it. Long-life antifreeze can remain effective for up to three years. If suspended particles, sediment, or signs of deterioration or discoloration are observed in the antifreeze, it should be replaced promptly, and the system should be cleaned. Can Different Antifreeze Brands Be Mixed? It is necessary to use the same brand of antifreeze. Different brands may have varying production formulas, and mixing them could lead to chemical reactions between additives, rendering them ineffective.
18
3
Share

What does BYD EV mean?

BYD EV specifically means the following: 1. BYD EV is the abbreviation for Electric-Vehicle, which directly translates to electric vehicle. Essentially, all models powered by electric motors can be referred to as EV. 2. The two most prominent parts of an electric vehicle are the electric motor and the battery. The electric motor is akin to the engine of a conventional fuel-powered car, while the battery that provides energy can be seen as the fuel tank. Below is some extended information about HEV: 1. HEV or HV stands for hybrid electric vehicle, which relies on both fuel and a battery to power the car. 2. A hybrid vehicle adds a battery and an electric motor to a conventional fuel-powered car. The battery capacity is usually relatively small but does not require external charging; it can automatically recharge by recovering energy during driving. 3. Since HEV batteries have a small capacity, the main role of the electric motor is to assist the fuel engine during driving, achieving fuel savings and improving acceleration and uphill performance. The car only enters pure electric mode when driving at low speeds.
3
0
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.