Why the 16 valve VAZ-2112 injector does not start well when cold: reasons and repairs

Some tips

Did your car fail?

Car owners complain that their car has difficulty starting when hot. If in the morning the vehicle can be started well, then after a short drive and turning off the engine, you will need to turn the starter while pressing the gas to start the engine. At the same time, it starts to smell like gasoline and stops for a few seconds.

Auto mechanics recommend solving this problem by replacing the following parts:

• spark plugs,
• fuel and air filters,
• installing a thick textolite gasket under the fuel pump,
• injectors,
• ignition module,
• water temperature sensor.

If the car has difficulty starting when cold, then the problem may be due to the use of low-quality gasoline. In this case, you must refuel only at trusted gas stations. Another reason why the Priora starts worse in cold weather is that the battery loses part of its capacity. The starter turns harder. The oil loses its viscosity and becomes thick. At low temperatures, it is recommended to fill in synthetics.

As a rule, to start the car, 1-2 rotations of the starter armature shaft are necessary. A vehicle in good condition will not have difficulty starting hot or cold. To do this, auto mechanics advise Lada Priora owners to adhere to the following recommendations:

Check all components of the ignition system
If these recommendations do not help and the engine does not start, then you need to check the ignition system.

The car doesn't start well

If the car doesn't start well when it's cold, it means it's not all that bad. The reasons are completely removable even at home. As a rule, the problems lie in the following:

• disgusting quality of gasoline. If the gas station overdilutes it, there will be too much water in the tank. Try visiting another gas station;
• ignition problems. It is often difficult to start the engine due to problems with high-voltage wires and spark plugs;
• oxygen sensor malfunction.

Reasons why Priora starts and stalls - what to watch

It happens that the engine in the car starts, and then immediately stalls. This means that all the initial processes are started, but it is not possible to “squeeze” them in order to bring the engine to normal operation. As an example, you can hear that the starter is turning, but the Priora does not start.

The starter engages, but the Priora does not start. This is a clear sign that the starter is transmitting force to the crankshaft, and some other part is not performing its functions in the starting cycle. Therefore, when the Priora starts and stalls, several systems are checked, which begin to work before the rest, starting the engine. Priora takes a long time to start for several reasons:

• The fuel pump creates insufficient pressure in the fuel system. This happens - the starter starts to turn the crankshaft, the spark comes from the spark plugs, but they simply have nothing to light - the fuel has not yet arrived.
• The ignition coil turns are damaged. The coil received a responsible mission - to convert the current from the battery into current for the spark plug so that it would work. Again: fuel is supplied, the crankshaft moves, but there will be no ignition. It’s also worth checking the candles here - with carbon deposits, they can also give such an effect.
• The intake tract is clogged or not sealed. That is, the problem is not in the fuel pump, but in the next “stage” of fuel supply to the chamber. It is recommended to blow out the filter.

Other reasons why a car won't start

Separately, it is necessary to consider such a case as a drop in compression in the cylinders. Signs of a malfunction are easy to notice by the car’s behavior: engine power and dynamic performance drop significantly. The engine may rev and consume more fuel. It is not difficult to identify the problem; this requires a special device - a compression meter. It is recommended to visit a service station, where they will take measurements in compliance with all the rules, or you can do it at home.

If the pressure in the cylinders has collapsed, this often indicates wear and tear on the engine as a whole. Actually, there is a fairly simple way to check your guess. It is necessary to pour 1 tablespoon of oil into the hole for the candle, and then repeat the measurements. The results may be as follows:

If the cylinder pressure is normal, then you need to take the car to a service station and carry out in-depth diagnostics of the engine; the problem is very serious.

Main types of “bad” launch

Typically, experienced drivers immediately assess the malfunction in the following way: “Poor hot start.” That is, it is clear that there are 3 types of bad startup:

1. Poor cold starting.
2. It starts poorly when the engine is hot.
3. Doesn't start well in any condition.

This means that these three types have their own characteristics, although they are united by one sign - the car is difficult to start. But in the first case, this only happens when the car has cooled down. Either this is the first start in the morning, or the Priora has been sitting long enough for the engine to cool down completely, or it is a harsh winter.

In the second case, the Priora does not start immediately, but only after several full turns of the crankshaft with the starter only when the engine temperature is above 90 degrees. That is, a fully warmed up engine. Usually after some mileage.

Well, the third option is when Priora is capricious in any conditions. Be it in the morning, at lunch or in the evening, on a cold or hot engine. Here we will consider the minimum possibilities that the owner has to solve this problem on his own.

Engine starting problems

Many Priora car owners are faced with a situation where the starter turns, but the car does not start. Before finding out the reasons for the breakdown of this vehicle, it is recommended to find out the principle of operation of the starter. This device is presented in the form of an electric motor with a gear that meshes with the engine flywheel and rotates it when starting. On the housing there is a retractor relay, which is designed to control the gear travel and automatically start the electric motor.

When the ignition key is turned to the start position, power is supplied to the relay and is drawn in by an electromagnet, moving the gear and simultaneously closing the contacts. Thus, the electric motor starts. When the ignition key is released, power stops flowing to the relay magnet. The last element works in the opposite direction, opening the contacts. As a result, the electric starter stops working.

If the starter turns, the battery is in good condition, but the car does not start, then it is recommended:

• touch the wires that come from the power supply. If they heat up, check the contact between them and the battery.
• install the terminals in place,
• check the connection of the ground terminal to the body,
• turn the ignition key to the “start” position and measure the voltage at the connector using a tester,
• check whether power is supplied to the relay from the ignition switch by disconnecting the connector from the solenoid relay.

Why the engine won't start

In order for the power unit to start successfully, the following conditions must be met:

• normal crankshaft rotation speed has been achieved;
• proper compression;
• good battery charging;
• quality fuel.

Thus, if the Priora’s engine does not start, you should suspect a problem based on one of the above points.

First of all, knowledgeable car owners check:

• battery;
• wiring;
• starter.

If the latter is generally functioning, you should make sure that it rotates normally. The problem sometimes occurs if the battery or other elements of the starting system were replaced the day before.

The lack of voltage in the battery requires a mandatory check of the generator, because it is he who must charge it. At the same time, very often over time, the contacts in the electrical circuits of the car become oxidized, contaminated, or simply become disconnected. This must be taken into account.

As practice shows, these are the reasons most often behind the inability to start when cold.

Main reasons

First, check the health of the battery

“I start the Priora, but the starter doesn’t turn.” Not all car owners know how to solve this problem. There are several reasons for this condition. First you need to check the battery. If it is faulty or not charged, the starter will not turn. The contacts must be well tightened and oxidized. If there is a click when you turn on the ignition, then the wires are normal and power is available. The battery will need to be charged. If the lights go out when you turn on the ignition, then you need to charge the old power supply or install a new one.

The starter does not turn and there is no click - the main reasons for checking the performance of the battery on another car. If the car starts quickly, you will need to check the wiring on the first vehicle. Often the power supply is working, but the starter does not turn. In such a situation, the nickels in the solenoid relay are checked, as well as the generator brushes. If smoke is coming from the starter, then it will need to be replaced.

Due to a break in the ground wire connecting the body to the power unit, the car does not start. This is due to heating of the brake, clutch or gas cable. This happens when it is not put back in place after repair. If the starter turns, but the engine does not crank, then the ring in the gearbox of the first unit has burst and needs to be replaced.

Solving the main problems

In order for the engine to start well when hot, you must follow certain instructions. The main task is to combine the mixture to start the engine. When starting a hot engine, you need to depress the gas pedal halfway. If you press the gas frequently, the situation may become more complicated.

In some cases, the Priora stalls while driving. Typically, this phenomenon is typical for summer weather, when the ambient temperature exceeds +25 degrees. The main reason is gas plugs in the fuel pump. They prevent the fuel pump from working normally. As a result, nothing remains in the float chamber, since no fuel enters it.

This problem can be solved by cooling the fuel pump. To do this, you will need to take a damp cloth and wrap it around the fuel pump. This method is relevant for Priora with an all-metal fuel pump. For models that use glass, this method is ineffective, since temperature changes will cause the glass to burst. If prolonged cooling does not help the hot engine start, then the problem is in the fuel pump.

Poor starting when cold - reasons

If the Priora doesn't start well in the morning, it's quite annoying. When the car has cooled down to too low a temperature, the reasons for the engine failure to start may be:

• Congealed engine oil or discharged battery. As a result, the crankshaft will rotate too slowly.
• The water in the ramp could freeze - then the fuel system would literally stop. Pay special attention to the gasoline you fill up with - if there is a lot of water left after it, you should change the gas station.
• The coolant temperature sensor is broken (the ECU will not be able to regulate its temperature). The oxygen sensor may also be damaged.
• Fuel injectors are depressurized.
• The cylinders have low pressure levels.
• The motor control system is faulty.

Diagnose the operation of the ignition module.

Lada Priora does not start when hot

The car has driven a certain distance, after which it stops and the car does not start the first time. What could have caused this? And there are a lot of reasons for this situation. Experts divide them into several groups:

• Breakdown/error of sensors/mechanisms in the control system.
• Fuel system malfunction.
• The power unit is worn out.

The best option would be if you check the presence of fuel in the injector frame. A common cause of this problem is a problem with the fuel supply. Open the hood and remove the decorative protective trim from the engine. In Lada Priora, between the radiator and the power unit there is a so-called intake manifold. Just below it is the fuel frame. The actual end part is equipped with a special bypass valve, which is always closed, in turn, with a plastic lid. The valve needs to be unscrewed and then pressed on the very core. At this very moment you need to be more careful, since a fairly strong release of fuel should occur.

Another method, of course, is not 100 percent reliable, but it is used. Immediately before starting, perform pumping several times; in other words, you need to wait until a device such as a fuel pump is turned off, without turning on the starter, then turn off the ignition, and turn it on again without the starter, and do this several times. Next you need to crank the engine. If overall starting has improved, then there was little pressure, and the first thing you should pay attention to is the fuel pump and filters.

Checking the exhaust system

It may be that your beloved Priora does not start due to a poor air-fuel mixture. The engine may stall if the exhaust gases are not removed but mixed with oxygen. In this case, there are only two reasons for the malfunction:

1. Malfunction of the muffler catalyst. This may be due to debris and dirt in it, and in frosty conditions the liquid contained in it can freeze.
2. The muffler itself sometimes freezes up due to the liquid in it, or it simply becomes clogged with debris.

Checking the ECU malfunction

This check is simply necessary, since ECU breakdowns are very common. This is the main reason if your Priora starts and stalls after a couple of moments. Some damage can be seen on the control panel. For diagnostics, you need a special device to detect errors.

If you are unable to solve this problem on your own, contact a specialist.

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If it stalls while driving, what is it?

First of all, when the Priora suddenly stalls when the engine is running, check whether you have left the clutch pedal - perhaps you were accidentally distracted by something and did not notice how you removed your foot. But usually the car stalls when the gas pedal is released while driving. Symptoms of the problem are as follows:

• increased fuel consumption, air consumption;
• injection takes longer (the engine operating cycle is extended in time);
• The idle speed control operates with a delay;
• The voltage in the power supply fluctuates.

The reasons why the Priora stalled while driving could be:

1. low-quality gasoline;
2. sensor error (incorrect readings when releasing gas), most often the idle air control sensor;
3. throttle valve error.