What's the abnormal tooth sound when the cold car of Binzhi engine starts?

Causes of "Da Da" sound of cold car starting

1. Hydraulic tappet: Due to low oil pressure or wear of the hydraulic tappet itself, air enters the hydraulic tappet and produces a "click" sound.

2. Valve clearance: The valve rocker arm is worn, resulting in excessive valve clearance.

3. Dirty throttle: The throttle is too dirty due to the continuous accumulation of sludge and carbon.

4. Working sound of carbon canister solenoid valve: This is a normal sound and can be used continuously. If the noise is too loud, it is recommended to go to the 4S shop for inspection.

Causes of "click" sound of cold car starting

1. Three-way catalytic converter: there is a "click" within half a minute after the cold car starts, and then there is no sound. This is generally the sound made by the expansion of the three-way catalyst after heating.

2. Timing part: There is a loud "click" sound when the cold car starts. Generally, the timing belt or chain is worn, stretched and loosened, and the chain tensioner loses its tensioning function, which leads to this sound.

3. Friction sound of air conditioning belt: If there is noise when the air conditioner is turned on, it may be caused by friction of air conditioning belt.

Causes of "Knock-Knock" of Cold Car Startup

1. The fuel tank exhaust valve is not working properly.

2. The fluid in the reflux pump has influence.

3. The internal part of the fuel filter is blocked. Extended data:

The abnormal sound of the engine indicates that the technical state of the engine mechanical device has changed. Abnormal noise in engine compartment

Solution: Send it to the factory for repair.

The abnormal sound of the engine indicates that the technical state of the engine mechanical device has changed. The main reason is that some parts are worn or even improperly adjusted. Some abnormal sounds can indicate that the engine may be accidentally damaged, so when the engine has abnormal sounds, it should be repaired in time to prevent the fault from expanding. Before disassembly, it is necessary to check and determine the fault position, and then analyze the abnormal noise characteristics of the engine, so that the position, cause and degree of abnormal noise can be basically diagnosed and the blindness of disassembly inspection can be avoided.

V-belt is the most common power transmission mode, which can be easily bought at an economical price and easily replaced. When the V-belt is worn or slack, the engine room of the car will make a "chirp" sound. If the V-belt is badly worn, it should be replaced.

There are two common reasons for V-belt wear: one is that the belt and pulley are not matched (the belt is too small), and the wear caused by this reason should be corrected by the correct combination of belt and pulley; Second, there are fragments on the pulley. In this case, belt wear can be prevented by cleaning the pulley.

There is a greater possibility of abnormal noise here. Belt howling is very harsh, usually caused by belt slipping. When the engine is running, if there is the sound of dry friction of metal parts outside, it is generally the performance of bearing damage of generator, water pump and steering booster pump. There is air leakage when the engine is running, which may be caused by the blockage of the exhaust system, air leakage or rupture of the vacuum tube. Need to be reminded that if the engine is abnormal, most car owners can't solve it, so it is best to send it to the factory for maintenance.

Abnormal sound of gearbox

Solution: You should go to the 4S shop for a comprehensive check-up.

If there is a "rustling" sound in the gearbox when the car is driving, but it disappears after stepping on the clutch, it means that the noise source is gearbox failure, which may be caused by the wear of gearbox bearings or gears and bearing spots.

Abnormal braking sound

Solution: Prompt to replace the brake friction plate.

The importance of braking system to driving safety is well known. Therefore, if the vehicle makes abnormal noise when stepping on the brakes, the vehicle should mainly be vigilant.

Brake friction plate is one of the most important components in the braking system. Generally, the service life of the front brake friction plate is 30,000 km, and that of the rear brake friction plate is1.20,000 km. If there is a "squeak, squeak" sound when braking, it is mostly a warning sound from the brake friction plate wear indicator, indicating that the brake friction plate exceeds the service limit. "In this case, the owner should go to the garage for repair as soon as possible, otherwise the brake friction plate will be exhausted, resulting in damage to brake parts, abnormal braking effect and accidents."

Abnormal noise during braking may also be caused by other reasons, such as improper use or deformation of brake disc materials, unqualified hardness, porosity, friction characteristics and compression characteristics of brake friction discs, wet and rusty brake friction discs and brake discs (which can be recovered after braking several times), excessively hard metal wires in the brake friction disc formula, scratches on mechanical brake friction discs, etc.

When braking, the brake disc friction screaming is mostly caused by excessive wear or substandard brake pads, which can be replaced.

Abnormal tire noise

Solution: Adjust the tire pressure or replace the tire.

When an automobile tire touches the ground, it will produce various kinds of noises with different intensities due to factors such as the type or concave-convex state of the road surface, the speed of the automobile, the type of the tire and the air pressure of the tire itself.

No matter how perfect the car is, it can't completely eliminate the noise generated by tires and the ground during driving. "However, these noises can be reduced by changing tires and adjusting tire pressure." In addition, if there is a metal collision sound inside the tires during driving, it may be caused by the damage of shock absorbers and bearings, and the owner should go to a professional garage or 4S shop for repair.

Tire noise must be rhythmic, and the faster the speed, the higher the frequency. If it is a low "snapping" sound, it is mostly tire tread deformation, bulging, serious wear or insufficient air pressure; If it is a "click", it may be that the tread is mixed with pebbles. It goes without saying that if the tires whir, the car body obviously shakes or even runs in the wrong direction, then the tires must have a flat tire. Get off and change the tire.