Cold carburetor car engine does not start

Incorrect engine start of VAZ 2109

Before drawing any conclusions, it is necessary to ensure that the driver correctly follows the requirements for starting a cold engine. For these purposes, carburetor engines have a manual throttle control drive. Without using this mechanism, starting the car, especially in cold weather, is quite problematic.

You need to start the engine in the following sequence:

• Open the hood and pump up fuel using the manual fuel pump pedal
• Pull the choke control handle towards you
• Pump gasoline into the manifold using the accelerator pedal
• Without pressing the gas pedal, start the engine

You may not be able to start the engine the first time. But the second time it should. You also need to pay attention to pumping gasoline with the gas pedal. The main thing here is not to overdo it, otherwise you can fill the spark plugs and then the engine will definitely not start. If this does happen and the car does not start, then press the pedal all the way, turn on the starter and, while it rotates, slowly release the gas pedal.

Compression reduction

A loss of compression in one or more engine cylinders is a consequence of natural wear or damage to the power unit. A motor with low compression does not, as there is a strong increase in the gaps between the parts in the cylinder. In other words, it is not possible to achieve the required pressure in the combustion chamber to ignite the working mixture at the time of start-up.

Frequent causes of this malfunction may be piston destruction, broken or stuck piston rings, burnout of the timing valve, wear of the cylinder walls, etc. Low compression most often appears during a cold start, but can also be present constantly (when trying to start a very worn engine “hot”). An engine with such a malfunction is most difficult to start at low temperatures. For an accurate diagnosis, compression must be measured.

The starter turns poorly on a cold VAZ 2109

This is one of the most common causes of poor fret starting. There are two sides to this: the starter is stuck or the battery is frozen. If everything is clear with the first case, then the second requires special attention.

In severe frosts, it is recommended to bring the battery into the house and charge it, then starting problems will be left behind. But if this is not done, the task may become more difficult. To start, you will need to turn on the low beam for a while - this will warm up the electrolyte. After this, you can try to turn on the starter for no more than 3 seconds. Each new attempt to start the engine must be accompanied by pauses of 30 seconds, 1 minute and 2 minutes. Otherwise, the battery will run out completely and instead of traveling you will have to wait until the battery is charged.

What else can you do?

You can try to revive a battery that has died prematurely using another car. Ask its owner to drive up to your car as close as possible. This will require cigarette lighter wires. As a rule, one of them is red and the other is black. The quick-release clamp of the red wire is connected first to the plus of the battery of the car that came to help, then to the plus of the patient. The same action is carried out with the black wire and the battery negative.

The “donor” must work for some time to recharge the dead battery, after which the engine can be started. You can talk a lot more about how to start a VAZ 2109 and 21099 carburetor in cold weather. After reading our description, you can independently build an algorithm for starting a cold engine in cold weather. Prepare yourself and your car for the cold in a timely manner, then such problems will bypass you.

Thickened oil

If in summer you can fill in oil with a lower viscosity or 20w40, then in severe frosts it freezes. It becomes very difficult to turn the crankshaft with frozen oil, so the manufacturer recommends using motor oils with a viscosity of 5w40 for the winter.

Another solution to this problem is the use of pre-heaters, which are connected to a 220 V network and heat up the antifreeze. Due to the heat transfer of the metal parts of the VAZ 2109 carburetor engine, the oil becomes thinner, and the engine can operate safely even in severe frosts.

Prevention of injector breakdowns

Why the injection engine does not start and how to eliminate possible problems is now known to all readers of our resource

However, it is better to avoid such breakdowns, so let’s pay attention to ordinary procedures that, if carried out systematically, will help minimize the risks of all malfunctions. The simplest but most effective prevention consists of the following measures:

• Firstly, refuel exclusively at proven gas stations and only with high-quality fuel. Remember that most fuel system and engine malfunctions are caused by dirty gasoline;
• Secondly, change all consumables on time and only with high-quality products. The most important thing is periodic replacement of all kinds of filters and engine oil;
• Thirdly, periodically check the main components of the machine for stability. The list of the latter, naturally, includes the injector, elements of the fuel system, ignition and engine;
• Fourthly, never neglect routine diagnostics of your car at a service station. Surprisingly, even a delay of a couple of hundred kilometers can cause serious damage, which previously could have been eliminated with very simple actions;
• And fifth, always operate your vehicle properly. That is, you do not need to overheat, overload or negatively impact your car in any other way.

Perhaps this is where the most important information on today’s issue has come to an end. We hope the material presented above was useful and provided answers to your questions. Good luck in operating and maintaining your car!

Incorrect ignition timing

If the VAZ 2109 starts poorly not only when cold, but also when hot, then the problem may affect the ignition system. An incorrect advance angle impairs starting properties, making starting difficult.

Typically, starting problems occur with late ignition. In this case, you can notice black smoke from the exhaust pipe, the electrodes of the spark plugs become covered with black soot, and popping noises are heard in the muffler when you press the accelerator pedal. You can try turning the distributor a few degrees or adjusting the ignition from scratch. The problem should go away.

However, an angle that is too early results in:

1. Detonation;
2. Engine overheating;
3. Leaning the mixture.

Battery diagnostics

If the car is parked for a long time, the battery loses charge and loses voltage. The voltage sags so that ignition simply does not occur. You can diagnose the battery using a multimeter.

To do this you need:

1. Open the hood;
2. Set the multimeter mode to measure voltage up to 20 V;
3. Touch the multimeter probes to the battery contacts.

The voltage should be 12.6 V. If the output voltage is less than this value, then this indicates a problem with the battery. A desirable action would be to check the density of the electrolyte. It is worth checking absolutely all contacts. First of all, you need to check them with a multimeter on the starter.

In an urgent case, when the VAZ 2109 needs to be started and started immediately, you need to turn on the headlights, thereby increasing the voltage on the battery. This activates the battery electrolyte.

In the case when the VAZ 2109 does not start on the injector, even with a charged battery. The reason may be in its terminals. It is worth checking for oxidation on them. This is why the VAZ 2109 does not start on the injector. A white coating forms on the terminals; it needs to be cleaned off with sandpaper.

Problems of the VAZ engine power supply system

First of all, you need to check the air and fuel filters. If they are heavily contaminated, the engine will have difficulty starting when cold. The design of the nine provides two fuel filters located under the hood and the car and one air filter. If they are intact, then check the operation of the fuel pump.

Try pumping gasoline manually. If it pumps poorly, then the fault lies in the fuel pump.

Next in line is the carburetor. Incorrect adjustment can lead to the car being difficult to start when cold. Idle speed should not exceed 900 and fall below 700. Soot on the spark plugs is unacceptable. Otherwise, the unit needs proper configuration.

DTOZh replacement procedure and timing

The procedure for replacing the DTOZh may differ depending on the car model. At the VAZ, to carry out the process, you need to prepare several tools, including the obligatory set of wrenches.

According to the classic scenario, the coolant will have to be drained, otherwise replacing the DTOZH cannot be called correct. Although there are several replacement options that do not involve draining.

As mentioned above, one of the DTOZH is located in the thermostat. It screws in from the side. The second is located a little lower, wrapped in the cylinder head.

A little about the timing of replacement of DTOZH. If we are talking about a regulator that goes to the pointer, then it must be replaced at the very moment when the temperature values ​​​​go astray. This is easy to check: for example, when the engine is cold, the coolant needle tends to the red zone or simply wanders. This is an error and requires correction, i.e., replacement of the sensor.

In some cases, it also happens that it is not the regulator itself that is to blame, but the wiring or contact. You need to check everything, and only then decide whether to change it or not. Testing the wiring is also easy: the wires are disconnected from the DTOZH, the ignition is turned on and a short to ground is made. If the arrow jumps up, then everything is in order with the wiring.

The second DTOZH changes if the machine itself is not working properly. For example, the speed of a cold engine does not increase, but when it is hot it reaches a value of 1500 rpm. Fault number 2 can also be judged by the cooling fan, which turns on too early or does not do so at all.

Temperature controllers that have been removed are easiest to check. They must be immersed in boiled water heated to certain values, then connect an ohmmeter to measure the resistance coming from the DTOZH.

• Absolutely legal (Article 12.2);
• Hides from photo and video recording;
• Suitable for all cars;
• Works through the cigarette lighter connector;
• Does not cause interference to radios and cell phones.

The main reason for the unstable operation of the Renaut engine

The main reason for unstable engine operation in Renault cars is a faulty fuel frame.

According to experts, one of the main reasons for poor engine starting in Renault cars is a faulty fuel rail.

Namely, in the contamination of the injectors. In order to check this, we need to remove the fuel frame and visually inspect it. If you see a burnt coating on it, be sure to clean it of all contaminants.

Demi-season reasons

• The funniest reason: the fuel has run out... No comments needed: look for what has run out. By the way, many people carry 5-liter cans with them just for this case: they don’t take up much space. And the good ones don’t stink, which is important.
• The anti-theft alarm went off. Or - even simpler: you yourself forgot to remove some kind of engine start lock. And it also happens: they tried to steal a car, but they didn’t have enough talent... In general, check your “security” just in case - what if this is the case?
• The fuel pump has failed. Everything is clear here: we are going broke installing a new one.
• The timing belt has broken. Note that the first sign of such a malfunction is easier rotation of the starter. If the motor is not plug-in, then just change the belt. If it’s plugged in, then you’re very unlucky. Expensive engine repairs are guaranteed.
• The timing belt jumped several teeth, completely throwing off the valve timing. We need to return to the “status quo”.

In modern cars, the hoods are most often opened only to fill the washer fluid.
Therefore, frankly, it will be better if an inexperienced person does not unscrew something without preparation. At the factory, we once used the following speech pattern: they say that unskilled intervention can aggravate the defect. In modern cars, the hoods are most often opened only to fill the washer fluid. Therefore, frankly, it will be better if an inexperienced person does not unscrew something without preparation. At the factory, we once used the following speech pattern: they say that unskilled intervention can aggravate the defect.

I ask everyone to whom the listed reasons seem elementary, to add your own examples to the proposed list. This will be useful - at least for beginners. Indeed, today, for a number of reasons, few people read all our publications, keeping the subscription “on the treasured shelf.” Therefore, sometimes you have to repeat yourself in something.

Good luck to everyone on the road. And... fewer reasons to climb under the hood!

Photo: depositphotos.com