The car will not start: possible causes and methods for eliminating them. Why won't the car start? Doesn't start hot or cold

"Citroen C4" - comfortable, elegant, in every way modern car. The manufacturer presents diesel and gasoline options with automatic and manual transmission. The French made the perfect car as planned technical characteristics, and aesthetic. But, despite this, owners encounter problems during operation - sometimes the Citroen C4 does not start. Let's look at the main reasons and find out how to fix these problems.

How exactly does it not start?

Many car owners who have encountered similar problems write hundreds, if not thousands of messages complaining that the engine will not start. But to understand exactly what’s wrong with the engine, you need to find out all the symptoms.

There's usually not that much possible options. So, it happens that the driver, as usual, turned off the previously normally working engine, parked the car, and in the morning his Citroen C4 does not start. It also happens that the engine starts, but it takes a little longer than usual. Sometimes the internal combustion engine can work normally, but suddenly stops and will not start again. They also often complain that the engine starts and immediately stalls.

These are not all the possible breakdowns. Owners often complain that the engine shoots or sneezes when starting. There are also frequent situations when the Citroen C4 does not start, the starter turns, but the car starts perfectly when towed. Experts also encounter symptoms such as when the car hasn’t even driven anywhere, but suddenly stops starting.

Knowing how the engine behaves, you can understand at least approximately what is wrong with the engine or with other car systems.

Typical faults

If the Citroen C4 does not start, do not panic. The success of the repair largely depends on how quickly and how well you can find weak link. To better understand the essence of possible repair work, let’s consider what can break.

Injection

It is possible to identify faults related directly to the injector. With such breakdowns, the car will not start either cold or hot. The “Check Engine” light will illuminate on the instrument panel. Less often, the engine runs with the light on, but in this case it will be difficult to start, and the operation will be extremely unstable. Most often, injectors become clogged in engines from this manufacturer. The ECU fails. These components should be diagnosed first if the Citroen C4 does not start.

Ignition

Also very often starting problems are related to the ignition system. Here possible breakdowns more. Usually the reasons lie in the spark plugs - they can be flooded with fuel. In this case, the engine starts and immediately stalls, and after several attempts to start it stops even starting. Rarely, but problems still occur with other components in the ignition system - this is the ignition coil or module, sensor crankshaft.

Fuel system

Starting problems can also be associated with poor or incorrect operation of the vehicle's fuel system. French engines may suffer from three possible problems here:

• clogged fuel filter. In this case, the symptoms will be as follows: the car seizes, but does not start; if it is possible to start, the engine will be very unstable.

• Faults related to the fuel pump can be identified. The car will not start under any circumstances and in any condition.

• Fuel rail pressure. If it is not enough, starting the engine will be very problematic. There is also a lack of cold and hot starts here, unstable work.

Engine

Well, in the end, the motor itself can be identified as the cause of the problem. Here are the most wide choose possible options. Most often the reason is poor compression or misadjusted valve clearances. With such problems, high-quality diagnostics are needed, otherwise it will be very difficult to determine why the Citroen C4 Picasso does not start.

How to bring life back into your car?

If the engine stalls and does not start, you need to find and fix the problem. Let's see what is included in the list of diagnostic measures. In fact, many operations can be performed with your own hands, without specialized tools.

When the starter turns but there is no effect

If the starter turns, but the Citroen C4 does not start, then you need to make sure that the fuel pump in the car is working at all. In most cases, the working fuel pump can be heard. Most often, the sound of its operation can be heard near the back sofa. A characteristic buzzing sound will be felt when the device is operating.

If the pump does not function, then experts recommend checking the integrity of the fuses, as well as the fuel pump relay.

It would be a good idea to check the ECU relay. If the fuses are in good condition, then you need to find out whether the relay turns on. Its performance can be determined by a characteristic click. This click will be heard when the car ignition is turned on.

Fuel system diagnostics

If the Citroen C4 stalls and does not start, then the problem may lie somewhere in the fuel system. If the pump is operating normally, then you need to make sure there is pressure in the rail. For this you will need a pressure gauge. Testing in the field is also possible. There should be a spool on the ramp - you should press it. If the pump is running, then the pressure in the ramp will be within 2.8 atm.

If you press the spool, the flow of fuel from it will be smooth. The pressure must be constant. If the pump is functioning quite normally, but there is no pressure in the rail, then you need to check the presence of fuel in the tank, clogged filters, and patency of the lines.

Pressure regulator

Injection engines operate under a certain pressure, which is pumped into the rail by a fuel pump and adjusted by a special pressure regulator. To diagnose it, disconnect the hose through which the fuel flows into the tank. With the hose disconnected, turn on the ignition. If fuel is supplied from it, then the problem has been detected and the regulator must be replaced.

If this malfunction occurs on the road, then you can plug one end of the regulator or clamp the tube. This way you can get to the repair site.

What else should you pay attention to?

If there is pressure in the ramp and there is gasoline in the tank, then the car’s ignition system should be diagnosed. For diagnostics, it is recommended to use a special spark gap. If there is a spark, but the Citroen C4 car does not start, then check the serviceability of the spark plugs visually, and then with special equipment.

Throttle valve

If this node does not work correctly, then you can’t expect quick startup and stable operation. Failure can be diagnosed in various ways. You need to unscrew the supply pipe, inspect the housing and the damper itself visually - perhaps wear or some mechanical defects will be visible.

When the motor is not running, the damper will be closed. If it cannot close normally, then you need to clean the throttle.

The engine starts and stalls

If a Citroen C4 car starts and stalls, then most likely everything is in order with the engine and its other systems, and the problem lies in the immobilizer. Diagnosing this malfunction is simple - usually on dashboard the lamp will light or flash. If the connection between the chip on the key and the immobilizer is lost, then you can forget about normal engine starting.

To solve the problem, you will need to use special equipment, which is available at official dealer. Otherwise, you can replace the key with a spare one.

Starter clicks, no effect

If, when you try to start, the Citroen C4 does not start and clicks, then we can say that the solenoid relay is faulty. It needs to be replaced. After replacement, the starter will be able to work normally. It is also worth checking the condition of the battery. When the battery is discharged, the current will only be enough to make clicks.

If the Citroen C4 does not start, the starter does not turn, then you should check the wire connections directly to the starter, as well as the relay.

The starter may not show signs of life if there is a bad ground or missing contact. But it also wouldn’t hurt to carry out diagnostics with a scanner. The car is completely controlled by electronics, and it is possible that there are errors in some of the components.

Doesn't start hot or cold

In the first case, faults associated with the coolant sensor can be identified. The sensor should be replaced. If there is no cold start, then all of the above is possible.

Diesel versions of Citroen C4

Diesel engines have a different operating principle than gasoline engines. And the reasons for a poor launch are slightly different here.

For diesel engines, high compression is important. If for a number of reasons the compression has decreased, then the air in the combustion chambers will not be sufficiently compressed. And if the air is not compressed, it will not heat up and the fuel will not be able to ignite.

Starting is often affected by various problems with glow plugs. Conventional diagnostics will not help here, since problems are not visible on a hot engine. But it will be problematic to start the engine when it’s cold with faulty spark plugs. Often the causes of failure lie not in the spark plugs themselves, but in the electronics that control the operation of the glow plugs.

There may also be problems with the fuel system. If any small particles get into the diesel injectors, the engine may not start. In this case, you need to pay attention to blue smoke when trying to start. If it is, then fuel is supplied to the cylinders, but for some reason the mixture does not ignite.

If the diesel Citroen C4 does not want to start in cold weather, then this may be due to fuel. It contains paraffin. In winter, such fuel thickens. It cannot pass through the filter in this state and, naturally, is not fed further. You need to use winter diesel fuel.

Problems often occur with the fuel line. If there are cracks in it, then fuel will escape from the system. The main thing to remember is that if smoke is visible from the chimney during startup, then fuel is entering the cylinders. If there is no smoke, then it is worth diagnosing spark plugs or compression.

Conclusion

So, we found out why the Citroen C4 car may not start. As you can see, the problem can be of a different nature. If this gasoline engine, then first of all you need to inspect the pump and spark plugs. Well, with diesel engines it’s a little more complicated. After all, if the problem is in compression or injectors, you won’t be able to fix it yourself.

For example, my colleague just the other day left her little Suzuki overnight with the headlights on. In the morning, at first I couldn’t understand why the alarm suddenly didn’t go off, the lights on the panel didn’t light up, and in general the car was clicking something, but the engine didn’t want to start. As you understand, the battery ran out and I had to light it. And then drive in circles around the editorial office instead of charging. A lesson for us all: if, when closing the car and setting the alarm, all electrical appliances do not automatically turn off, make sure you turn everything off before leaving, even the harmless interior light.

Again, don’t forget to pay attention to the wheels. We monitor the tire pressure and check the integrity of the studs. By the way, the middle of winter has passed, we might as well stop by for balancing. It would be a good idea to inflate the wheels every couple of weeks; in cold weather, air leaks faster, and unevenly inflated wheels affect both handling and braking quality. None electronic system They won't straighten your car if the tire is flat.

Visibility is another issue. The outside of the car will be covered with snow, the inside will fog up, so people drive on a whim, relying on the prudence of the surrounding drivers and on the miraculous plastic images that are glued to the front panel. You can't do this, colleagues. We clean the glass thoroughly, using a scraper and brush. We use sprays that help quickly remove ice if you don’t mind the money. We buy only proven anti-freeze so that it doesn’t stick in the tank one fine morning. Experienced people say that the easiest way is to buy blue liquid on the highway for a fee, and you can see how it behaves in the cold.

Bad wipers are also a problem. In the evening in the light of street lamps thin layer dirt on windshield There is a lot of glare and distorts the image. Sometimes replacing rubber bands with silicone ones doesn’t help; it’s better to throw away the old metal brushes and buy newfangled frameless ones. You'll spend about a thousand if you don't buy them at a car dealership, but they will clean perfectly.

Further: in the morning you don’t want to run around a frozen car, performing shamanic dances. That is, you want to get inside without hindrance. Therefore, at a car wash, if you decide to do water treatments in the cold, ask them to blow out the locks compressed air and wipe the rubber seals dry. For lubrication, you can use special sprays; there are plenty of auto chemicals now. In general, you need to have a duty can of WD-40 with you; if the lock does not open, spray it inside and wait. Then he will give in. True, such products wash out the lubricant from the locks along with moisture, so it will need to be restored.

Start the car correctly. First, turn the ignition key not all the way and turn on the headlights for a few seconds, let the electrolyte in the battery warm up. Do not touch the gas pedal; if the gearbox is mechanical, depress the clutch so that the motor does not turn the gearbox shaft. Then start the engine. The motor does not catch - do not turn it for a long time, release the key, give it a rest for two minutes. Then again. If the battery is known to be weak, and the car has been standing in the cold for several days, it is better to remove it in advance and bring it into a warm place. It will warm up and start your engine like a darling.

Diesel fuel is a separate issue. Modern diesel cars are free from childhood diseases and start in the cold no worse than gasoline ones. But they are still very sensitive to fuel quality. Therefore, do not even think about refueling at nameless or dubious gas stations; choose exclusively premium fuel from branded chains, then there will be no problems.

In general, in cold weather main problem For diesel engine represent paraffins, which are always present in the fuel and turn into a solid state when cooled. Antigel additives, which are now abundant in car dealerships, prevent fuel from freezing in the fuel line and prevent filters from clogging fine cleaning. In addition, additives “disperse” water from the fuel. Experts recommend brands Mannol, CRC, Ravenol, Hi-Gear, Wynn’s. You just need to add additives before frost. When the fuel has already become cloudy, and even more so has become viscous like a gel, it is too late to add additives. The additive acts only on dissolved paraffins, that is, the fuel must warm up. It turns out that if the fuel is not filtered and the engine does not start for this reason, we take the car to a warm garage to warm up on a rope or tow truck. Then we add the additive to the tank in the ratio specified in the instructions.

Nowadays a car is not a luxury, but a means of transportation. Every driver has faced a problem when his “iron horse” refused to go. This is the most unpleasant situation, because of which you can be late for work, miss a vacation with friends or another important event. So what to do if the car won't start? To begin with, don’t panic, many problems can be solved on your own and without visiting a car service center. So, if the car does not start, you need to look for the reasons under the hood.

Voltage problems

A common problem when starting an engine is low voltage or no voltage at all. First of all, you need to check the fuses. Not every car depends on the safety system to start the engine, but it is still worth doing.

Over time, any wiring connections to the battery can become oxidized or dirty. This will result in no current flowing. It is necessary to clean the battery terminals and wire connections with a dry cloth or sandpaper. After that, try to start the car again.

If the terminals and wires are in order, then you should check the battery. A dead battery is a common problem. You can check the battery charge using a tester or external signs. To check the performance of the battery, insert the key into the ignition and try to start the engine. A “weak” starter is a clear sign that the battery is discharged.

There are several ways to fix the problem with a dead battery. Light a cigarette from another car or try to start the car from a tow. The second method is only suitable for cars with manual transmission transmission If the car does not start, you will have to remove the battery and charge it. Do not forget that the deadline battery is no more than 5 years.

Problem with starter and ignition switch

The battery may be charged and the high voltage wires are fine, but you still won't be able to start the engine. Then the cause of the malfunction should be looked for at the ignition switch or starter.

To check the serviceability of the ignition switch, you need to insert the key into the ignition switch and turn it to the second position. If the red lights on the dashboard do not light up, then the ignition switch may be in out of order. You can check it in another way. When you try to start the engine, turn on the headlights; if they start to dim, it means the ignition is in working order. A malfunction of the ignition switch can be eliminated in most cases by replacing the switch.

Corrosion and dirt damage not only the wires on the battery, but also the starter. To check the starter's performance, you will need a tester and an assistant. The electrical tester is connected to the wire that supplies the car's starter. At this moment, the assistant should try to start the engine. If the tester shows that there is electric current on the wire, but the starter does not crank, then this problem can be solved by replacing the starter. Attention! Do not forget about precautions, do not touch wires and other parts of the engine with bare hands. It is best to carry out this procedure while wearing dielectric gloves.

There are times when the starter turns, the car does not start. What to do in this situation? To answer the complex and trivial question of why the car won’t start, you need to check other components of the car. Lack of spark is another option why the engine refuses to start. Checking the spark plugs should be the last thing on your mind; first you need to deal with the ignition coil.

Ignition

So, if everything listed above is in good condition, check the ignition. First you need to test the ignition coil. It is checked with a multimeter. If such a device is not available, then you can stop by the nearest car service center.

It happens that moisture accumulates in the ignition distribution cover, this can cause the engine to not start. The cover must be removed and checked for moisture. Any moisture or condensation that appears must be removed with a dry cloth. Since you had to remove the cover, you should check it for cracks. A cracked lid should be replaced with a new one.

The wires on the ignition coil may be damaged or leaking electrical current. Place the tester near the wire insulation. Functional wires will not conduct current through the insulation. If the tester shows that the wires are faulty, you will have to buy new ones.

Spark plug

Spark plugs are designed to ignite fuel-air mixtures. They meet different types: spark, incandescent, semiconductor and others. If your car does not start, then turning the starter for a long time will lead to flooding of the spark plugs. After which they will need to be changed. Otherwise, working with flooded spark plugs will harm other parts of your car.

Problems in the fuel system

Car won't start? The starter cranks at full power, but the engine still won't start? Then the problem should be looked for in the fuel supply. On modern cars Electronic fuel delivery is often used. The problem is that it will be difficult to diagnose on your own. Diagnostic equipment is expensive, and you need to go to a car service center. But there are signs by which you can understand what kind of malfunction is in the fuel system, thereby saving you money on diagnostics.

The very first thing you should do is check all the electrical wires under the hood. It will take a lot of time, but it's better than paying a lot of money for diagnostics. Each injector that supplies fuel to the system has its own separate wire. Check all wires with a tester, and also pay attention to the insulation.

Car won't start? The causes of malfunction when starting the engine may be in the operation of the fuel pump. Its performance can only be checked using special equipment, which not every driver has. You can try to find out the cause by checking the voltage on the positive wire of the fuel pump. It may be missing due to a faulty fuse. If the fuse is good and there is no voltage in the wire, then this problem can be solved by replacing the fuel pump motor relay.

A working fuel pump does not mean that fuel system in order. The filter may become clogged and not supply fuel. To prevent this from happening, it should be changed every 20,000 km. You can replace all these parts yourself. Why doesn't the car start if the entire fuel system is in good condition? We don’t despair and look for the problem further.

No compression

Does the car start and stall or not start at all? This may happen if the engine lacks compression. Compression in an engine is the ability to maintain the pressure that is created in the combustion chamber when the piston rises to its highest dead center. Compression is measured with a special device - a compression meter. Whether you need such a diagnosis can be determined by external signs. Blue smoke from the exhaust pipe, unstable engine operation or idle speed do not stand still - these are all reasons for weak compression. Such an engine will consume more oil and fuel. If you put your hand on the exhaust pipe and small drops of oil remain on your hand, then this is another symptom of engine failure. It is best to contact specialists. After all, the cause could be a burnt-out piston.

Timing problems

The timing belt is responsible for the operation of the engine in the car. Sometimes a metal chain is installed instead of a belt. Both are responsible for rotating the crankshaft and camshaft.

When using a car, every part wears out over time. The timing belt is no exception. Under constant load, it wears out and can rupture. Such a violation will lead to damage to the engine valves, and subsequently to its breakdown. And then a problem arises: the starter turns, the car does not start. What to do? A complete timing belt repair or valve belt replacement can be quite expensive. Therefore, to prevent such a problem from occurring, it is advisable to change the belt every 2 years (this is approximately 60,000 km).

You shouldn’t delay replacing it if you don’t want to harm your beloved car. Leave the belt replacement to professionals to avoid stretching.

The engine does not start in cold weather

Start the car in severe frost- it’s a difficult matter, but not hopeless. If the outside temperature is -15 °C or lower, then any battery loses 50% of its power, this is another problem why the car has trouble starting. To “wake up” the car, you need to turn on high beam for 10-15 seconds. This will allow the electrolyte in the battery to warm up to produce additional energy.

Attention! Never turn the starter for more than 5 seconds. Otherwise, there is a chance that the battery will die completely or the spark plugs will flood, which is unacceptable at low temperatures. If the car is in good condition, then on the 2-3rd try everything will work out and your car will start.

It happens that the battery is completely dead. This can be understood if the car stalls and does not start. In this case, you will need a cigarette lighter. If the car has injection engine, then it will be more difficult to “light” due to the large number of electronics. You can “light” from another car even when its engine is running. The main thing is not to confuse polarity and order. However, if you made a mistake and mixed up the signs, run quickly to get a new battery.

After connecting to the “donor machine” you need to wait 10-15 minutes for your battery to charge. Afterwards, we disconnect from the car and try to start. If the engine starts, give it a couple of minutes, otherwise it will stall.

Remember that starting the engine at sub-zero temperatures is equal to 500 km. Take care of your car.

Can't determine the cause?

Your car won't start, and you decide to find out the reason yourself, but it doesn't work. In this case, there is no need to “torture” your car. Contact specialized car services for help. The services contain highly specialized diagnostic equipment, with the help of which all faults and breakdowns of the car can be quickly found. After a complete diagnosis, they will tell you why your car won't start.

Up to half of all malfunctions associated with engine starting problems occur after parking the car at night, not necessarily in the cold season. I will try to consider all possible situations and the sequence of actions in each of them. I’ll say right away that the article is more geared towards novice car enthusiasts, although I’ll try to give useful tips and advanced drivers.

So, in the evening the car arrived at the parking lot under its own power. You went to rest, came in the morning and...
1. The car does not open from central lock, does not respond to key actions, the starter does not turn.
Most likely, the battery is discharged (fully or partially). To check the battery voltage, you need a multimeter. The cheapest Chinese version of this miracle device is quite inexpensive (from 200 rubles).

It’s easy to learn how to use it; sometimes they teach it in physics classes at school. It is simply necessary to have it in the on-board kit. Switch the multimeter to the =20 Volt position (measurement limit) and touch the battery terminals with the probes. Which one doesn’t matter; if you mix it up, a minus sign will appear in front of the measured voltage value. Ideally, the red wire goes to the positive terminal, the black wire to the negative terminal. The normal voltage value is more than 12.6 Volts. If there is such a value, but the car is silent, the instrument does not light up, which means the terminals do not have a normal electrical connection to the car. Usually the negative terminal is to blame for this; its wire has rotted away from the body or from the engine; you should check the connection points. One of the powerful distribution fuses may have failed. They are located in the engine compartment near the battery. In some cars, for example BMW, the battery is located in the trunk, and the voltage is “lost” along the way. But under the hood there is still a + terminal, it is usually in a red cap, by the way, they usually light a cigarette with it - they start it from another car:

If the voltage is in the range from 9 to 12.6 Volts, then the instrument panel should still turn on when turned on, but the starter should not.

There is another option, it is rare, but it does occur. The voltage on the battery is more than 12 Volts, and when the ignition is turned on, it drops to almost zero. Then maybe it’s time to bury the battery - there is an internal break in it, most likely even melted. This occurs even on new, low-quality batteries. When people ask me which battery is best to buy, I answer: put in a row the batteries that correspond to your car (by starting current, ampere-hours, size, wallet). Then pick up each one. Whichever one seems the heaviest - buy it, it contains more lead! There is less chance of melting, and the battery will be sold at a higher price at the end of its service life.
A common reason for battery discharge at night is leakage (current consumption by the car when the ignition and all electrical appliances are turned off). How to check? Remove the negative terminal, into the gap (!!!) between the negative terminal of the battery and the removed terminal, turn on the multimeter, switched to 10 Ampere mode (you also need to transfer the + probe there). Make sure all electrical equipment is turned off and doors are closed.

Normal leakage is up to 0.5 Ampere. In 10 hours with such a leak, 0.5 X 10 = 5 Ampere*hours are consumed, i.e. 10% battery capacity. Typically, a leak of about 0.05 - 0.1 amperes occurs mainly due to the alarm. If the leak is larger, then there is a short somewhere (this is very dangerous!) or faulty equipment (the same alarm system, radio, light, optional equipment). Finding the leak circuit is a rather complex problem, I will pay attention to it, but not in this article.
Alternatively, the charging may not be working; the car arrived with a dead battery. In addition, if the diodes of the generator are broken, then the latter can drain the battery in a couple of minutes. If the diodes of the generator are broken, you cannot drive at all; the generator can heat up to the point of ignition. As a last resort, disconnect all the terminals from the generator and drive on one battery.

2. The ignition is turned on. The lights on the dashboard begin to blink randomly.
Auto electricians often call this mode “color music”. The reason is insufficient voltage, poor contacts at the battery terminals, poor connection of the negative bus to the body. It is necessary to clean the terminals with coarse sandpaper and tighten them securely.

3. The ignition is turned on. When the key is turned to the extreme start position, the retractor relay is activated, but the starter does not rotate.

It is possible that the battery has enough current to activate the traction current, but the contacts of the starter drive, the so-called nickel, do not close and the starter does not rotate.

In all of the above options, the first step is to charge the battery. Only after charging, before connecting the battery, check the polarity three times, otherwise you can do a lot of trouble.
You can light a cigarette from another car, but follow the rules:
the wires must have a thick cross-section;
First, the positive bus is connected to both cars, then the negative one;
the donor car starts, charges for at least five minutes, the discharged battery needs to be “tightened up”;
some owners of “donors” risk lighting a cigarette while the car is running, but otherwise they have to “pull it up” longer;
turn on the start for no more than 15 seconds.

4. The ignition is turned on. We turn on the start, the starter rotates the engine, but the car does not start.
This is the most common case. And there are a lot of options here. I will list only those that can be overcome in the field.

If you have diesel car, and in the morning there is a deep minus, do not be upset, you are not alone in your trouble. Maybe the fuel has become waxed. For the future, add additives to it, or at worst, dilute it with kerosene. For harsh areas, it is better to install a heating band on the filter; if you are interested, closer to winter I will write how. Check the operation of the glow plugs. You can’t check them in bulk; it’s better to remove each spark plug and connect it to the battery for five seconds to make sure they heat up. If the problem is not electrical (and this can only be determined by diagnostics), check the compression, perhaps a spray can help you " quick start" Well, first of all, check all the fuses, both under the hood and under the steering wheel, if you don’t know which one is responsible for what. If you are aware, only those who are responsible for the engine and immobilizer.

About the immobilizer. If he got loose, i.e. The software connection between the key-immobilizer and the engine control unit is broken, then there is a direct path to an auto electrician. This often happens when the battery is removed while the ignition is on, or when the battery is discharged. This can be indicated by the “key” icon on the dashboard. It's an unpleasant thing, binding costs a lot.

If you have a gasoline car, then it’s easier to start checking with a spark. To do this, I recommend carrying a working spark plug in reserve. Remove the high-voltage wire, insert a spark plug, throw it on a metal part of the engine and turn the starter, there should be a spark. In car models where each spark plug is serviced by its own coil, you will have to remove one of the coils. If there is no spark, it means that the power supply circuits of the engine control unit are broken or the coil or switch has simply burned out.
During startup gasoline cars and some diesel engines the fuel pump turns on for a couple of seconds. He is standing in the tank behind, and you can hear a buzzing sound. If this is not the case, then the main engine control relay does not operate. It would be a good idea to tug on the relays; contact may be broken.

Another problem is an abnormal alarm system. It can block the engine control unit. Very often, car owners ask to turn off previously installed alarms; this is not an easy task.

In my experience, most engine failure problems are related to basic auto electrician problems: there is no contact where it should be, and there is contact where it should not. In any case, you should not panic and change all the main blocks in a row. It is necessary to 100% determine the nature of the malfunction, then take action.