The ignition coil is faulty and damaged, preventing the engine from starting and operating normally
Failure of the ignition coil will cause a partial short in the winding secondary, causing the engine to be weak or even unable to start. The main reasons for its breakdown include reduced dielectric strength of the high-voltage insulation of the secondary winding and excessive operating voltage. Among them, the decrease in dielectric strength of the high-voltage insulation of the secondary winding is mainly caused by humidity in the secondary winding, overheating of the ignition coil, and aging of the insulation material. The ignition coil operating voltage is too high, usually due to too wide a spark plug electrode spacing and too high a generator voltage. In addition, when the high voltage line is disconnected, the electricitygenerated high voltage tricity has no way to pass through, which may also cause ignition coil failure.
For example: a Tianjin Xiali TJ7100 car is easier to start when the car is cold. When the engine water temperature reaches normal water temperature, the operating stability gradually decreases, accompanied by problems with the starter gear and. the flywheel ring. The sound of teeth clashing. When the ambient temperature around the motor increases, the motor will begin to vibrate violently and even stop rotating, making it difficult to restart.
Based on the above phenomenon, through comparative tests of high low temperature and high voltage fire tests using new and old ignition coils, it was found that the diode and the secondary coil of the ignition coil assembly were broken. down. Analysis of the breakdown phenomenon:When the car is cold, the failure of the ignition coil and diode is not very obvious, and it can still work. When the engine reaches its normal operating temperature, the ignition coil temperature increases due to the increase in ambient temperature, resulting in a decrease in the insulation level. A short circuit occurs in the secondary, the ignition voltage decreases, the spark plug misfires and. the engine stops; and because of the diode in the ignition coil prevents the current flowing through the additional resistor from returning to the electromagnetic starter switch
If there is a strange or unusual noise when the car is driving normally this requires special attention. Any unusual noise coming from your car means that something is wrong with the operation of your car.
1. Abnormal noises from the engine system
1. GrayHigh Frequency Squealing: If your car makes a grinding noise when starting from cold and it lasts for a while. Next, you should consider checking the drive belt and replacing it if necessary. Generally speaking, this noise occurs when the drive belt is slipping or the edge is worn.
2. Slight metallic impact noise: If you feel a noise similar to metallic friction back and forth in the direction of the engine after starting, it may be that the oil-air mixture in the engine's combustion chamber is not completely burned. This often happens if low-grade or low-grade gasoline is used. Keep an eye on the coolant temperature to determine if the engine is overheating. If it is abnormal, you should quickly replace it with high-quality gasoline or add additives to increase the zinc index. Sometimes excess depositscarbon deposits in the engine cause such abnormal noises. Cleaning the fuel system may relieve symptoms. In short, once such noise occurs, it must be eliminated and resolved as quickly as possible to avoid shortening the life of the engine.
3.Soft click: If you still hear a slight click coming from the direction of the engine when the vehicle accelerates, or a clicking sound similar to a click, the sound is not loud, but it will continue, but it will continue after parking. No more ringing. Generally speaking, such noise is caused by a lack of oil in the engine or uneven valve clearance caused by the oil filter not being replaced for a long time. First check the engine oil. If it is not missing, you can only go to the repair shop to check the valve clearances or carry out engine repairs.
4. The sound of knocking: People often mention thatthe engine knocks. Do you know what knocking noise is? be accompanied by some engine vibrations. Because the noise is loud, it is usually a serious problem. You should stop driving and stop for repairs as soon as possible to avoid further engine damage.
5. Light hissing sound: You will think that such hissing sound is the sound of blowing air. Some people may think it is their own illusion, or careless people do not pay attention to such a sound. at all. If this noise is confirmed to exist, it is necessary to determine whether the vacuum tube is broken or the vacuum is leaking, causing motor loss and low efficiency. To find out the cause of the sound, you need to check where the leak is, observe and determine the source of the sound.
2. Abnormal noises from the brake system
1. High frequency squealing noises will occur as soon as the brakes are applied: Sometimess, new brake pads squeal when used for the first time. replaced. But it will soon disappear. If it does not go away and there is a grinding and piercing noise when braking, you need to think about whether it is installed incorrectly or whether the brake system needs to be inspected.
2. Squealing when you press the brakes and stopping when you don't: If there is a squeal as soon as you press the brakes, and the squeal disappears when you release the pedal brake, it is obvious that your brake pads. It's time to replace them. Since most brake pads feature soft metal, this metal layer is used to trigger a warning sound if the brake pad's friction material is about to wear out.
3. Other types of abnormal noises
1. Obvious rhythmic noises: If the car accelerates or decelerates, the car will emits louder, rhythmic sounds. If you feel a loud noise. , but it does not appear at other times, you should pay attention to check whether the tires are normal. If the tire rubber is old, damaged, blistered or heavily worn, this sound will appear, accompanied by slight vibrations.
2. Louder noise: If you start the car and there is a loud noise, a bit like an explosion, generally speaking, the engine exhaust system is malfunctioning and the spark plug is delayed, causing a loud noise. caused by excessive accumulation of fuel and air mixture in the combustion chamber. Generally speaking, older cars tend to make such noises. When a loud noise occurs, the only thing you can do is to stop driving immediately and find a professional to repair it.
3. The vehicle makes a clicking sound when turning: This situation generally occurs in thes front-wheel drive or four-wheel drive cars. This clicking noise comes from the steering bearing. Although the sound is not loud, there may be potential risks. , so it is best to carry out maintenance and inspection as soon as possible.