Reasons why the injection VAZ 2114 does not start » NaDomkrat

Fuel pressure control

The regulator consists of a membrane and a spring. During a malfunction, it may hang open and because of this, the fuel pressure in the system will not be enough for the engine to operate correctly and to start it, so the engine stalls when cold.

To check the functionality of the valve, it is not enough to simply remove the hose from the pump and see how strong the gasoline pressure is. Diagnostics must be carried out with a pressure gauge. There is a special connector for it on the fuel rail. We connect the device and try to start the engine. If the pressure in the system is below 3.6-4.0 atm , this is an indicator of a problem in the fuel supply system.

It is better to replace the pressure regulator in a special service, but if you want to do this process yourself, then follow the instructions:

1. Disconnect the battery terminal;
2. Remove the hose from the vacuum brake booster;
3. Drain gasoline from the system;
4. After this, start disconnecting the fuel rail from the pressure regulator.
5. Replace and install everything in place.

If all work is performed correctly, the fault in this part of the system will be eliminated.

HBO for cars

A hot engine can also cause a breakdown in the case of an installed gas system. Since driving on gas has recently become profitable, many drivers switched to this type of fuel, however, they did not take into account some of the nuances of the new system. In hot weather, gas expands more, which leads to increased pressure inside the system and often causes damage. This is why it is bad to drive on gas in the heat.

At high temperatures, seals and hoses can fly off, which leads to gas leakage.

The result is an extremely dangerous situation. To avoid this, try not to fill the tank to full gas in the summer, this will reduce the pressure in the system and the risk of breakdown. If a similar problem occurs, it is recommended to let the car cool down and then visit a service station. You should not repair the gas system yourself; the equipment should be adjusted by a specialist.

Weak battery or oxidized terminals

The starter does not turn - this is another common problem. Its cause may be deposits or corrosion on the battery terminals or a dead battery.

Remember that the generator will not be able to charge the battery completely and from time to time it is advisable to charge it from the mains. This will help it not lose its capacity and increase its service life.

If you notice that the terminals have strange deposits on them, you should clean them and treat them with a special lubricant that will prevent a similar problem from occurring again.

INDEPENDENT DIAGNOSTICS IN THE GARAGE

If you have problems with the operation of the injection system, you should first diagnose the ECU. In this regard, the owners of the VAZ 2114 are more fortunate with the German VDO instrumentation - it has a self-diagnosis mode. On cars with a dashboard from Schetmash there is no such functionality.

VDO dashboard for VAZ 2114

Working with the self-diagnosis mode on the VDO panel is carried out according to the following algorithm:

• With the ignition off, hold the odometer button for several seconds;
• turn the ignition to position “1”, release the button;
• if the arrows start running on the display, everything is fine, press once (information message about the firmware version) and release, with a second press an error code will appear;
• You can reset the error by holding the button until “0” appears.

Injection problems that cause the car to stall can be indicated by the numbers 1 (ECU error), 14,15 (coolant sensor errors), 22, 23 (DPS errors), 33, 34 (MAF errors), 42 (ignition malfunction) , 44, 45 (lean or rich mixture). The disadvantage of self-diagnosis on the VAZ 2114 is that if there are several errors, the system sums up the codes. Thus, the number “22” may mean a TPS error or low on-board voltage and a coolant sensor error (8 + 14).

For more accurate diagnostics of the injector, you need to immediately contact a service center or purchase a diagnostic scanner (it costs about 1000 rubles).

If you have another car, you can find the problematic sensor by replacing the sensitive elements one by one with known good ones.

Bad ground on the engine

What to do if the VAZ 2114 starts and immediately stalls? It is worth checking the ground on the body and engine. The terminals there may oxidize or rust. Check their condition, if everything is normal, it is worth checking the wires for integrity.

An undercharged battery may be due to poor mass conductivity through the engine. To avoid such problems, after cleaning and checking, it is worth treating all connections with a special lubricant.

Clogged breather

If the car starts and stalls when cold, then perhaps the reason is a clogged breather. The problem occurs due to the high mileage of the car, the use of low-quality oils, or wear of the piston group.

An engine malfunction can be diagnosed using several points:

• Increased oil consumption. It is thrown out of the engine into the intake and exhaust;
• The spark plug electrodes become oily;
• Drives oil out of the engine under the seals and gaskets.

If obvious signs of malfunction are detected, minor repairs will be required. It is necessary to remove the engine valve cover and thoroughly clean it of oil and dirt. It is also worth blowing through all the channels to clean them. Then we put everything back together.

Main reasons and methods for solving them

Healthy! Maybe you are lucky and resetting the injector errors will help. To do this, you first need to remove the negative terminal from the battery. If after 5-10 minutes the car starts as well, then this is not the problem.

Difficulty starting the engine is influenced by a number of simple reasons, which you can eliminate yourself in the garage, having a standard set of tools with you.

Starter mechanisms (brushes, bendix)

In the process of rebuilding the starter. The arrow indicates worn brushes.

• On used cars, the brushes on the starter wear out. In this case, you need to remove the cover and replace them with new ones;
• A starter that has been in use for a long time can be sorted out, cleaned all the mechanisms, washed with WD-40 and filled with new lithol, since the old one is most likely coked and formed into balls;

Fuel problems

In the process of replacing the fuel pump grid. On the right is the old one, and on the left is the new coarse mesh

Small particles of debris getting into the gas tank. This problem is treated by cleaning the fuel system and replacing the filter.

Incorrect sensor readings

Failure or incorrect signal supply from the sensors to the ECU (their diagnostics are required, and if a malfunction is detected, replacement with new ones):

1. Speed ​​sensor.
2. Crankshaft position sensor.
3. Idle speed sensor.
4. Phase sensor.

Wires, filter and spark plugs

Clogged air filter

• High-voltage wires are broken, poor contact on the tips (oxidation). During a visual inspection, it is rarely determined whether the best option is to replace it with new or known good ones. Before replacing, you can clean (blow out) the contacts on the old wires.
• The spark plugs are flooded, mechanically damaged, or the gap is set incorrectly. If necessary, the following is done: new ones are screwed in, the required gap is set, or the old ones are returned to their place.
• The air filter is clogged, causing the air supply to the engine combustion chamber to deteriorate. It is recommended to replace with a new one.

Gasoline pump

The fuel pump is located under the rear seat

The fuel pump does not provide the required pressure, which is why the injectors do not spray fuel, but simply splash it. In order to discard this option, you need to measure the fuel pressure with a pressure gauge (the nominal one should correspond to the norm of 3.2 bar).

If the result is different, the situation requires replacing the fuel pump.

Engine failure

Reduced compression in the cylinders is one of the most terrible situations for a car owner. In this case, flammable gases enter the crankcase, and new vapors do not ignite.

Preparing to measure engine compression

In this situation, replacement of the piston rings is required, and perhaps a major overhaul of the engine.

The starter works, the engine turns, but the car does not start

So, the starter spins, the engine spins, the pistons move, but the engine still won’t start. Here the problem is most likely in the fuel-air mixture, perhaps the marks have come off, etc.

Before sinning on the fuel-air mixture, the first thing you need to pay attention to is the crankshaft sensors:

DPKV - if it malfunctions, it is very difficult to start the engine, and the running engine runs unevenly, intermittently, and the power drops noticeably.

Next you should pay attention to the labels:

1. Mark on the timing camshaft gear (photo).
2. Markings on the flywheel under the thermostat (photo).

If the marks do not match, most likely the belt has simply slipped by one tooth, the camshaft gear itself may be worn out, it needs to be adjusted and installed correctly!

Next we will talk about the air-fuel mixture.

I warn you in advance that the easiest way is to do computer diagnostics of the engine or look at the errors on the on-board computer.

The air-fuel mixture is the combination of air, gasoline and the spark needed to ignite it.

Air supply

As a rule, a malfunction in the air supply should not affect the problem of starting the engine. For better or worse, the engine should still run. However, we will not go through the air system sideways.

We recommend: Decoding and methods for eliminating error codes on Ford Focus

The following sensors are responsible for air metering and supply:

1. Mass air flow sensor is the most expensive sensor; if it fails, then the car simply begins to consume liters of gasoline, then this sensor can simply die “to zero”, but it indirectly affects the starting of the car. That is, no matter how it fails, the car should start.
2. IAC - should not affect the problem of starting the engine. If it malfunctions, problems arise at idle.

Spark

Here may be the real reasons for our problem:

1. First of all, we look at the candles. We turn the candles out (How to remove the candles?) and look at their condition:

A normal spark plug should have a slightly brick color; if the spark plug is wet, the spark plugs are flooded; you need to clean and bleed the cylinders by cranking the engine at idle with the starter with the spark plugs turned out. If one cylinder is flooded - the problem is local (High-voltage wires, faulty spark plug, injector), all cylinders are flooded - a general problem (ignition coil, brains, oxygen sensor, fuel pressure in the rail)

2. Next, check for the presence of a spark. To check the spark, see the following article: How to check the spark?

• If there is no spark on one cylinder, there is a faulty spark plug or high-voltage wire.
• If there is no spark on two adjacent cylinders (1-4 or 2-3), then the problem is in the ignition coil or in the ECU.
• If there is no spark anywhere, then the problem may lie in the ignition coil or in the ECU, in mismatched timing marks, or in a non-working DPKV.
• If there are no problems with the presence of a spark, then the problem lies in the fuel supply.

Fuel supply

Two points are very important in fuel supply:

• normal fuel pressure;
• working injectors.

If, when you turn the key into the ignition, you do not hear the fuel pump pumping, then therein lies the problem. If the pump pumps, then first of all we measure the pressure in the fuel rail: How to measure the pressure? and draw appropriate conclusions.

High fuel rail pressure coupled with a malfunctioning fuel pressure regulator can flood your engine in an instant.

6. Crankshaft sensor malfunction

If you are looking for the answer to the question “why does the VAZ 2114 stall when cold,” then pay attention to the crankshaft sensor. It is responsible for controlling ignition and fuel, and if its operation is disrupted, then processes in the engine will occur at the wrong time. You can easily diagnose the problem thanks to the check - if there is a malfunction, it will blink or light up. To replace the sensor, it is better to contact a service center. You can do this yourself, but it is advisable to drive onto an overpass or pit for convenience.

Less commonly, the mass air flow sensor fails, which will affect engine performance.

Why is the VAZ 2114 8-valve injector difficult to start?

For some reason, it seems that many drivers of this model will be interested in the question of why the VAZ 2114 8-valve injector does not start well. Finding the cause of this phenomenon is not as easy as it might seem at first. This is due to certain difficulties in troubleshooting in this model, since injection systems differ from carburetor systems. The algorithm for identifying possible problems will be built differently, adapting to the design features of the machine.

Why is the VAZ 2114 8-valve injector difficult to start?

, we will try to consider in this work. In a short article it is impossible to consider absolutely all possible problems; there are some that can only be identified with the help of diagnostic equipment. But, nevertheless, we will try to analyze as many such situations as possible in order to help all VAZ 2114 owners decide what to do in such a situation.

Why might the engine be difficult to start?

You can look for the culprit in such a situation in several directions. Among them, the most important problems are:

• Malfunctions in the ignition of a VAZ 2114 car
• There is no pressure in the fuel rail of the 8-cl VAZ engine
• Air leak into the VAZ intake manifold
• Timing belt marks are misaligned

Engine diagnostics using spark plugs

Let's look at the first option, why the VAZ 2114 doesn't start well. To do this, unscrew the candles and look at their color. If there is black dry carbon on the candles, we can say that the engine has been running for a long time on a rich mixture, which covers the candles with black carbon.

Why does black carbon appear on the spark plugs of an injection car:

• Malfunction of the mass air flow sensor
• The first oxygen sensor has failed
• Fuel pressure regulator is faulty
• Malfunction of fuel injectors

White carbon deposits on the spark plugs of an injection car appear due to a lean mixture, the reasons for the appearance:

• Everything is the same as with black soot
• Malfunction of the fuel pump or clogged fuel filter (check the mesh and fine filter)
• Air leaks through the air flow sensor pipe, the place where the regulator is attached to the XX joints of the manifold.

Checking the spark plug spark

The lack of a spark on one 8-cl spark plug of a VAZ engine will not affect the engine starting, it will be noticeable when idling, tripping and jumping revs. But if the ignition module of the VAZ 2114 is faulty, then the spark disappears in two cylinders 1-4 or 2-3. To check the spark plug spark, take out the fuel pump fuse, unscrew one spark plug or take a spare one, remove the high-voltage wires one by one, put them on the spark plug, then put the whole thing on ground (in this case, the valve cover) and ask a friend to crank the engine with the starter, so we check each spark plug. If there is no spark on one spark plug, most likely there is a defect in the explosive wires; if there is a spark in two or all spark plugs, it is highly likely that the problem is in the ignition module or the wiring to it.

The timing marks on the VAZ are not set correctly

Another reason why the VAZ 2114 does not start may be a mismatch of the timing marks. The reason for the mismatch of the marks may be weak timing belt tension, cut teeth, or the crooked hands of a mechanic at a service station.

A discrepancy of more than two teeth will noticeably affect the operation of the engine of the fourteenth. With a slight deviation, the engine starts up a little worse, does not hold idle, and stalls when switching to neutral gear. If the deviation exceeds 4-5 teeth, the sound of the engine changes, air escaping under pressure through the valves that are not opened in time becomes audible, thrust noticeably disappears, and starting the engine is extremely problematic.

• To check, we need a “10” key; use it to unscrew the three bolts securing the timing case.
• Next, put the car in 5th gear and push it until the mark on the camshaft pulley and the rear cover match, you can also turn the pulley with the key to “17”
• We remove the protective plug from the clutch housing and see if the mark on the flywheel matches the mark; if not, then you need to loosen the tension roller and align the belt according to the marks.

Checking the crankshaft sensor VAZ 2114

Perhaps this is the only sensor without which a VAZ car will not be able to start at all. If, when the engine is cranked with the starter and the ignition and fuel supply are working properly, there is no seizure or ignition of the fuel, then the problem is in the DPKV. The cost of the sensor does not exceed 300 rubles; it is better to replace it. However, there is a way to check: checking the crankshaft sensor video

If after the performed operations it was not possible to determine the breakdown, please write your problem in the comments, I will be happy to answer your question!

Engine starting

There are several fairly simple rules, following which you can relatively easily start your car engine in cold weather.
Before starting, you should, as they say, wake up the battery. To do this, just turn on the headlights on high beam for just a few minutes. Then, turning on the ignition, you need to wait 10-15 seconds. During this time, the fuel pump will have time to pump fuel into the injection engine. After this, they press the clutch - the starter turns a certain number of parts, and this action will reduce their number and reduce energy consumption.

A few more tips

In very severe frosts, you can try to warm up the engine oil. Various methods are used, but the safest of them is the use of electric heaters in the form of tens. They are placed under the engine crankcase for about 30 minutes, after which you can try to start the engine.

The problem of a dead battery can also be solved. If there are cars nearby with running engines, you can ask their owners to “light up” their car. This will require long wires with quick-release terminals, and the ability to connect them correctly. First, connect the ground of both cars and only then the positives of the batteries. Disconnection is carried out in the reverse order, otherwise the batteries may be damaged.

The timing marks are off

Another problem that the engine on a VAZ 2114 is difficult to start can be a skipped timing belt. This happens when there is poor tension or excessive wear. A discrepancy of more than two teeth will be significantly noticeable in the operation of the motor.

To check the mechanism, it is enough to remove the timing belt protective cover. Afterwards we mark it and check it.

If a discrepancy is found, repairs will have to be made. It is better to contact a good service station with this problem.

When faced with the problem of poor cold starting with a VAZ 2114, you should not hope that normal warming up of the engine will help fix it. Cars of this brand are quite simple, and if any problem arises, it should be looked for in the mechanics, since there are not many electronic systems here.

The procedure for returning the car to “life”

Let's say you find yourself in circumstances where the injection engine starts poorly or refuses to do so at all. There is no need to hesitate in such a situation - it is advisable to immediately begin resuscitation procedures. If you don’t have time to figure out the exact reason why the car doesn’t start well, then you should quickly carry out the following algorithm of actions:

In general, there are no particular difficulties in repairing a non-starting injector. The main thing in the process of such work is to act competently, in accordance with the procedure and possible vehicle malfunctions described above.

Fuel system

If it is below -20 degrees outside the window, it is possible that condensation has formed in the tank. The presence of water in gasoline is a bad sign. Moreover, it is not necessary that it be “diluted” at the gas stations themselves. Due to the temperature difference, condensation forms on the walls of the tank. At low temperatures it freezes. As a result, the VAZ-2115 (injector, 8 valves) does not start. Frozen water can be both in the fuel lines and in the filter itself. There is no point in trying to turn the starter with the hope that the car is about to start. You'll just drain the battery. The only solution to the problem is to warm up the car. It's better if it's in a garage with this problem. By installing an oil or induction heater there, you will quickly warm up the air temperature in the room. And the car will start successfully.