What are the main reasons why the car does not start well?

Reasons why the car won't start:

1. The exhaust pipe is frozen.

The appearance characteristics are fog cylinder pressure, normal oil supply and power supply, and no car. This situation is easy to occur in the use of particularly low frequency of vehicles, such as the home is particularly close to the unit, the water vapor after the combustion of the engine freezes at the muffler of the exhaust pipe, the ice of yesterday is not finished after short-distance driving, and today's ice is frozen, and the time is long, affecting the exhaust, and it is serious and cannot be started. The solution is very simple, put the car in a warm environment, and the ice can be started naturally.

A complete solution can be to run at high speed in time, and the car will run more, and the heat from the exhaust will completely melt away the ice and expel it.

Second, the valve gelatinization.

Winter vehicles, especially after the use of unclean gasoline, the gum in the gasoline will accumulate near the intake, exhaust valves and combustion chambers, which will cause difficult starting, or even no fire, in the cold morning. Emergency method: You can drop some oil into the combustion chamber, which can generally be started.

After starting, go to the service station for dismantling and cleaning, and seriously dismantle the car for maintenance and cleaning of the cylinder head.

3. The ignition system is not in good working condition.

In especially cold weather, due to the low intake temperature, the fuel is not atomized well in the cylinder, and if the ignition energy is insufficient, the result will be flooding, that is, too much fuel accumulates in the cylinder, exceeding the fire limit concentration and cannot be landed. Emergency method: You can unscrew out the spark plug to wipe off the oil between the electrodes, and you can start the car after installation.

The thorough approach is to check the ignition system and rule out the causes of low ignition energy, such as spark plug electrode gaps, ignition coil energy, high-voltage line status, etc.

Fourth, the flow of gasoline is blocked.

The performance is characterized by no oil pressure in the engine oil supply pipe. This situation usually occurs in the morning when the temperature is very low, and is caused by long-term dirt in the fuel line. When the temperature is very low, the water mixes with debris and the fuel line is blocked, and as a result, it cannot be started.

Emergency method: Put the car in a warm environment, and the car can start after a while; Or use the method of cleaning the oil circuit to solve it completely.

Fifth, the battery is out of power.

Its performance is characterized by the starter starting to rotate but the speed is not enough, that is, it is weak, and then the starter only clicks and does not turn. Low temperature in winter and forgetting to turn off individual electrical equipment will cause the vehicle to be unable to start, especially in winter for long-term short-distance low-speed use, the battery voltage will be lower than the rated value, starting and unable to operate normally. If it happens, please call the service station for rescue**, or find the right car, or temporarily on fire, and then you must go to the service station to replenish the battery.

1. The oil attack time of the oil gang, as well as the pressure of the spray head, the density of the oil, the cover and so on, are too many reasons; I don't know which one you want?

The density of the engine oil is too large, which affects the speed of the motor, and the cold weather affects the atomization effect of gasoline, which is not good for the car.

The reasons for the car's poor start are as follows: 1. Identify the cause of the failure. For diagnostics of such faults in which the engine does not start, the battery should be tested first.

It is necessary to find out if the engine does not start because the battery is insufficient. 2. Detect ignition timing. The timing belt slippage is the root cause of the failure of the engine to start due to the absence of sparks.

3. Detect the starting system. In the case of faults such as engine failure to start, the first thing to do is to check the circuitry in the engine starting system. From the perspective of the most basic composition and guessing form, the circuit of the starting system generally includes the following basic parts, that is, the battery, the starting motor and the cables connecting these parts.

Reasons why the car starts badly:1. Low ignition energy of spark plugs; 2.

carbon deposition in automobiles; 3.The battery is low or beyond its useful life; 4.clogged exhaust pipes; 5.

Insufficient low pressure in the fuel circuit; 6.The timing of the release ingenuity is wrong. Solutions to various factors that cause difficulties in starting the car:

1。If the ignition energy of the spark plug is weak, it may be because the service life of the spark plug has expired, and the spark plug should be replaced regularly to avoid the difficulty of destroying the key when the car starts the sleepy gear; 2.If it is due to carbon build-up in the car, there will be a slight shake when slowing down.

Throttle remnants, intake carbon deposits, fuel injectors, etc. It should be cleaned regularly to avoid carbon accumulation; 3.If the battery is low, the battery can be powered; If the battery is past its useful life, it needs to be replaced; 4.

Clean the exhaust pipe regularly to avoid clogging; 5.If it does not ignite the first time, it may be that the low-pressure oil circuit is building up the oil pressure. Try again.

6.If the engine is not on the right time, you need to find a professional repairer to repair it.

For reference, 1. Sensor failure; 2. The quality of gasoline is not up to standard; 3. The air leakage of the inlet pipe leads to the mixture being too thin; 4. The fuel pressure is low, and the injector and fuel filter are blocked; 5. The signal of the pressure sensor and the throttle position sensor is abnormal; 6. The signal of the sensing liquid tank device is abnormal, resulting in inaccurate ignition timing and late ignition; 7. Weak high-voltage sparks due to poor spark plugs, igniters or high-voltage wires; 8. The throttle is dirty; 9. The exhaust gas recirculation system works poorly; 10. The exhaust pipe is blocked; 11. The cylinder pressure is low; 12. Turbocharging system failure 13. Clutch three-piece set 14 Air filter blockage, piston ring break or stuck, poor valve sealing, late ignition time, carburetor mechanical failure, air intake pipe leakage, individual cylinders do not work well or do not work, etc. However, some of the faults of insufficient engine power can be solved by use. Such as:

The general wear of the cylinder is high, and the flow of the carburetor oil channel is not smooth. When the user reflects that the engine power is insufficient, when the oil is burned, we should first judge the cause of the lack of power, in the exclusion of the air filter blockage, the carburetor throttle can not be fully opened, the ignition timing is not good, the intake pipe gasket is damaged, the individual cylinder does not work or does not work well, and then according to whether the engine fuel consumption is too high to judge the carburetor working condition, if the fuel consumption is too high, the exhaust smoke is very thick, it is likely that there is a mechanical failure such as the volume hole falling off, this fault must be repaired as necessary. Finally, we have to judge the wear and tear of the engine cylinders.

Engine wear directly affects the tightness of the cylinder; The most convenient way to check the tightness of the cylinder is to use a cylinder pressure gauge to check the compression pressure of the cylinder.

Common causes of engine starting difficulties:

1. The ignition difficulty caused by carbon deposition in the car is accompanied by slight shaking when idling, cleaning the throttle, cleaning the carbon deposition in the inlet tract, and cleaning the fuel injector can solve the problem.

2. The ignition energy of the spark plug is weak, and some car owners do not replace the spark plug after the maintenance cycle in order to save money, which will lead to a serious decline in the ignition energy of the spark plug, resulting in a lack of fire, and at present, the engine of many models of the spark cavity is mostly direct injection in the cylinder, so that the requirements for the spark plug are higher.

The first reason is a damaged battery. If it is for this reason, it is difficult for the general owner to find it by himself, and it needs to be sent to the maintenance plant to be tested by professional computer equipment. In addition, there may be a battery power loss, if you often drive in the city at low speed, and the headlights, air conditioning, audio and other equipment are always on, the battery consumption is relatively high, there may be a loss of power.

It is recommended to run at high speed so that the battery can be fully charged.

The second reason is that the mixing ratio of the car is not normal, which is also the most common and typical reason. In this case, the engine is generally ignited normally, but it just can't start. This phenomenon usually occurs when the throttle, intake valve or idle motor is too dirty.

If the valve is too dirty, the oil will be sprayed on the back and absorbed by carbon deposits, so it can't be hit. Generally, a little cleaning can solve the problem.

There are generally two types of car engine starting difficulties:

1. The starting performance of the engine gradually deteriorates, and the starting time is getting longer and longer; Congratulations.

2. The engine has always been very good in starting, and it suddenly deteriorates one day.

3. The engine starts to deteriorate slowly, and most of the reasons are that the battery performance is not good. In this kind of car, when turning the ignition switch to start the engine, the speed of the engine is instantly high, and then the starter appears to be underpowered, so that the engine speed is extremely low, and it takes a long time to start the engine. In this case, the old battery must be removed as soon as possible and replaced with a new one.

After replacing the battery, most of them can immediately improve the starting performance of the engine.

4. If the starting performance of the engine has been poor for a long time, it is likely that there is a problem with the ignition system or fuel supply system. For example, the spark plugs, high-voltage wires, ignition coils, etc. in the ignition system are faulty, and the carburetor in the fuel supply system is poorly adjusted. To solve this kind of problem, you need to have some skills, and it is best to ask a professional repairer to help check it before the problem worsens.

If you don't have the skills to do it yourself, it's best not to make adjustments.

The reasons for a bad start could be:

1. Spark plugs.

The ignition energy is higher when the cold car starts, and the electrode gap of the spark plug will become larger after using an orange scattered mileage.

2. Clean the throttle.

Carbon deposits on the throat walls of the intake manifold will affect the amount of air intake, and carbon deposits behind the valves will adsorb fuel and affect gasoline atomization. If carbon deposits are detected, clean the intake pin channel.

3. Check the gasoline pressure.

The low pressure of the gasoline pump makes it difficult to start due to insufficient oil supply. In this case, replace the gasoline pump or open and close the electric door several times to make it easier to start when the pressure of the gasoline pipe increases.

4. It is possible that the weather is cooler, and the mixed gas inside the engine is not atomized well.

There are several reasons why the car won't start: one. No oil. Two. Power. Three. No air intake.

Let's analyze these four items approximately:

One. No oil.

The reasons for the failure are:1The oil pump relay is working poorly. 2.The oil pump is not working well. 3.Out of gas.

Fault Detection: 1Detection of oil pump relays:

Turn on the key switch and don't hit the motor, you will hear a click, which means that the relay is working properly! If there is a continuous clicking sound, check whether the wire of the iron cover is loose. If the relay is judged to be damaged, the light relay can be interchanged with the oil pump relay.

Drive to the repair shop and buy a new relay.

2.Detection of oil pump: Generally, it is checked with an oil pressure gauge, because it is self-excluded.

There is no oil pressure gauge! The easiest way to do this is to remove the tubing and turn on the key switch on the position. Do not start the motor.

If the oil pipe is injected, it means that the oil pump is normal. On the contrary, it is not normal.

Two. Power. Cause of failure:

1.The head of the battery pile is loose. 2.

The high-voltage ignition coil is damaged. 3.The cylinder line is damaged.

4.The starting relay is a macro or not, and it is damaged. 5.

Whether the insurance is burned out. 6.Whether the motor is working properly.

7.Whether the main output cable of the computer case is loose.

Fault Detection: 1Detection of loose battery pile head: observe whether the instrument is displayed, if the whole car has no electricity, open the hood, and observe whether the battery pile head connection is loose and oxidized. Loosen it with a wrench, and pour boiling water on the pile head for oxidation.

2.Detection of ignition coil: You can use a multimeter to check the resistance value of its primary and secondary coils, which should be within the conforming range, and the secondary resistance should be larger than the primary resistance!

But that's not sure if it's in good condition! Unplug the cylinder wire, observe it for flashover, and see if there is any leakage in the insulation! The jumping fire should be blue, and the sparks are thick and long!

3.Detection of steel wire: check the resistance value with a multimeter, which should be within the load range. Unplug the cylinder cord and observe it for a flashover. Or skip the fire and replace.

4.Detection of starting relay: There is a problem with the general relay, and there is no response when hitting the motor. Plug and unplug the relay again to see if it starts normally! Replace the relay or motor shorted.

5.Detection of the fuse: Open the fuse and observe whether the fuse indicator is normal and whether the fuse is burned. Replace the fuse.

6.Motor detection: mainly listen to whether the sound of the motor is normal. If the carbon brush of the motor is severely worn, it can be temporarily activated by hitting the motor with a hammer. Go back to the repair shop for replacement.

7.Whether the main output line of the computer box is loose: check whether the computer box and its wiring are loose, and whether the plug-ins of each sensor are loose. Fastening is recommended.

Three, no air intake.

Cause of failure: Damage to the eccentric wheel and wear of the eccentric shaft, resulting in the intake and exhaust valves cannot be opened and closed.

Troubleshooting: Call a tow truck!

If it helps you, please light it up, thank you.

Hello: There are many reasons for poor engine start in the morning, and the buried analysis is as follows:

There are faults in the engine, such as air leakage in the intake system, insufficient gasoline oil pressure, damaged parts, etc.

Poor quality of gasoline, resulting in carbon on the back of the intake valve, and the injection system fuel injector directly sprays gasoline on the back of the intake valve, when the cold start in the morning, the carbon deposit has been completely dried, at this time it is like a sponge, adsorbing gasoline, causing a temporary lack of oil, so the engine will shake, or even stall, but after starting again, it is better or completely normal, generally prevention is heavier than **, it is recommended to add the original gasoline additive G17 to prevent carbon deposit.

The volatility of gasoline products is too poor, gasoline injected into the engine must absorb heat and gasify, in order to be ignited by the engine, when the volatility is insufficient, part of the gasoline is still in the liquid state causing the engine to start cold and lack of oil, the temperature after the hot car increases, the vaporization is good, the problem is naturally solved, the most recent example is that the introduction of 98 unleaded gasoline in the oil caused by many cars cold start bad, we should be familiar with it.

Due to the rise of environmental protection concepts and strict regulations on exhaust gas prevention and control, the stage of the most pollution generated by automobiles is from cold start to warm car, so major manufacturers are developing the latest technology for this area. But all in all, it is an accurate measurement of the amount of engine fuel injection, never too much, so this area is very sensitive, when the external conditions change, it is easy to affect the cold start, but after the hot car everything is normal rock resistance, for the repairer is really indisputable, but for the sake of future generations, start again, should be bearable and do a part for environmental protection.

Hope it helps: