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 are 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, electricityhigh voltage generated has no way to pass, which can 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: Whenhe 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 running; and because of the diode in the ignition coil prevents the current flowing through the additional resistor from returning to the electromagnetic starter switch
Is it normal for the engine to make a clicking noise at idle?< /h3>
When the car is operating normally If there are any strange or unusual noises, it requires special attention. Any unusual noise coming from your car means something is going on in the operation of yourcar.
1. Abnormal noises coming from the engine system
1. High frequency grinding noise: If your car makes a grinding noise during a cold start 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 promptly replace it with high quality gasoline or adouter additives to increase the zinc index. Sometimes excessive carbon deposits in the engine cause such abnormal noises. Cleaning the fuel system may relieve symptoms. In short, once such noise appears, it should be eliminated and resolved as quickly as possible to avoid shrinkage. Short motor life.
3. Soft click: If you still hear a slight click coming from the direction of the engine when the vehicle accelerates, or a click, the sound is not loud but it will continue, but. it will stop ringing after parking the car. 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 motor repairs.eur.
4. The knocking noise: People often mention that the 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 coming from the braking system
1. Squealing noises at haute frequency will occur as soon as the brakes are applied: Sometimes new brake pads will squeal when first used. 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. Rhythmic noisess obvious: If the car accelerates or decelerates, the car will make louder and rhythmic sounds. If you feel a dull 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, resulting in a loud noise. 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 do it immediately. Stop driving and call a professional for repairs.
3. The vehicle makes a clicking noise when turning: This situation usually occurs in front-wheel drive or four-wheel drive cars. This clicking noise is coming from the steering bearing, although this situation is not the case. noisy, but there may be potential risks. It is best to carry out maintenance and inspection as soon as possible.
First of all, does this "click-click" sound occur at startup or does it occur in slow motion after startup?
If there is abnormal noise during instant start, there will be no abnormal noise at idle after starting the engine. The fault point is then most likely a fault in the carbon brush inside the starter. The working principle of the starter is that after the electromagnet is energized, the electromagnet works to combine the starter gear with the motor flywheel and rotate at the same time, then the motor canto start up. the engine starts, the gear will quickly return to its original position. This fault is caused by the starter gear not returning quickly, causing abnormal noise caused by the flywheel gear, so the starter motor should be checked.
If there is an abnormal noise at idle after starting the engine, the fault point is most likely due to hydraulic pressure inside the engine cylinder head and excessive valve clearance . Since the vehicle has traveled many miles and been used for a long time, the engine valves and hydraulic pressure will experience some wear. If the gap is too large, a “click” will be heard. To fix this problem, you need to disassemble the cylinder head and replace these two parts.