Bad start on a cold diesel. On a cold machine it gets bad

Modern cars are equipped with various options that should facilitate the start of a cold engine, but often these devices do not cope with their tasks, and the engine is badly wound up in the cold, and even not at all. At the same time, a warm engine can work very easily and well.

Early in the morning, under the hood of the car, vanity and fuss begin in an attempt to warm up the unit and start it. Every car enthusiast dreams to get into his car in the morning, just to get it and go, and not to think, the motor will start or not. Let's see why the car gets badly on the cold and we learn how to solve this problem.

The root of the problem

Solving the problem with a cold start is difficult, because there is no exact answer to the question of the poor start of a cold engine. For the basic reasons, one can take the absence of a combustible mixture in the combustion chamber or the malfunction of the candles. This is a consequence. All the rest is the cause. Sometimes all the fault is the wrong supply of fuel to the combustion chamber. Mixtures may not be enough, or, conversely, too much.

The main reasons

Among the main reasons for poor start-up are the following:

• Poor quality of fuel.
• Clogged injectors.
• Ultra-low air temperature.
• Clogged fuel filter for fine fuel cleaning.
• Litter in a coarse filter.
• Faulty fuel pump.
• Dirty air filter.
• Contamination in the throttle valve or idling valve.

Do not immediately try to find all or one of these symptoms. If the car gets badly started on the cold, first thing is to observe the behavior of the machine during start-up.

Looking for symptoms

Often when starting, the starter works fine, but the engine can not start. If you unscrew a candle, it can be both dry and filled with gasoline. This is a kind of indicator. A lot can tell the smell of fuel. If gasoline does not have a characteristic pungent smell, then the reason is in it. However, if the candle is wet and the gasoline smells as it should, then the essence of the breakdown is hidden somewhere else. If everything is in order and the smell of fuel is correct, the injectors are completely clean and the pressure in the fuel system is normal, then you should continue the search.

Ignition problems

On a cold machine it gets badly started due to several reasons. So, it is necessary to check the battery level. If it is extremely discharged or its service life is coming to an end, it may not produce enough current to start. To understand that the reason in the battery, you can by the way the starter behaves. He does not spin the engine or spin, but unstable.

Often there is a problem with tumbler cars from Honda. Here the reasons should be sought in the ignition distributor cover. If there is a problem, the starter will spin the engine well, but the car gets badly started on the cold one. The candles in this case will be flooded with gasoline.

Trembler and armored car

There may be problems with the armored cable. This is also a frequent breakdown in the tumbler auto. To detect this problem, you do not have to make any effort. It will be enough if the starter makes several turns. The wires, if there is a reason in them, will light up. In this case, they should be replaced.

Ignition coils

Often a bad start can be associated with a strong wear of the ignition coils. If only one coil is installed in the vehicle, then the diagnostics can be carried out using a tester. But if the coil is not alone, then it is practically impossible to diagnose, and all of them almost never fail out of action. For a normal start-up, even one running coil will suffice. The variant with coils should be checked last, if everything else is already excluded.

Candles

Sometimes the machine is badly started on the cold because of any problems with spark plugs. As practice shows, this is a pretty popular reason for bad starts. When dismantling candles on them, you can find traces of dirt, plaque and carbon deposits of different colors. In addition, they can be filled with gasoline and smell strongly. In this case, the candles are carefully cleaned with a steel brush.

If it has traces of gasoline, then this indicates that they were flooded. It is necessary to constantly have a set of serviceable in the trunk, or better - a new one, not to clean and dry the old ones, but simply to install new ones.

Compression

The car can badly start up in a frost at weak or at all absent a compression in chambers of combustion. Ideally, before you start the engine, measure the level of compression, but in fact no one does it. But the reasons for the disappearance of it must be known and be able to eliminate them.

Other reasons

A problematic start may be due to a faulty starter. Frozen oil, condensate in the exhaust system, crystallized antifreeze. To get out of the situation when a cold machine gets badly started, it is necessary to use oils with a viscosity of 5W30, 5W40 or 0W30 and 0W40. The starter should untwist the crankshaft to 100 rpm. The most important thing is fuel. It should have saturated vapor in the composition.

VAZ

If the classic VAZ is badly started on the cold, it means that the settings were lost or a lot of small defects accumulated in the car. It is necessary to conduct a small maintenance.

During this inspection, check fluid levels in the engine crankcase, gearbox, fluid level in the cooling system and the braking system.
Next, inspect for oil, fuel or antifreeze. If the machine is long standing, the fuel can evaporate from the float chamber, it is necessary to replenish the level with a hand pump. At this check, special attention should be paid to the spark plugs and high-voltage wires.

If VAZ is carburetor, then this element can be clogged. Also, it is necessary to examine the membrane of the trigger device, the tightness of the tubes of the vacuum amplifier, the membrane of the gasoline pump. Also make sure that the starter is working correctly.

The injector does not start in the frost: the causes

If you get a bad start on a cold injector, you should look for a malfunction in the injectors. The injector unit will operate as a clock, but only if it is in perfect condition. Especially their condition is actual in the winter period, when clumps of non-fuel origin can seriously complicate the launch.

Often, the nozzles are customarily changed according to the regulations from the car manufacturer. It is also necessary to wash them regularly, especially as the quality of fuel leaves much to be desired. When flushing nozzles at home, it is necessary to monitor their tightness.

If the injector engine starts and immediately stalls, then this is a sign that the ECU is trying to supply a combustible fuel mixture to the combustion chambers. The candles are filled with gasoline and as a result the motor will not work properly.

Diesel engines

If for petrol engines the first problem is candles, then for diesel engines - a bad compression. Badly it is got on a cold diesel engine at weak compression. A little bit better the motor will work if it gets warm.

About poor compression signals rough work, vibration, blue smoke from the exhaust pipe. If you look under the hood and open the engine, the unit will be completely in oil. Another lack of compression can be identified by reducing power, increased noise during operation, as well as a large consumption of fuel and oil.

If it is badly started on a cold diesel, the first thing to measure the level of compression. If the unit is fully functional, then its level is from 30 kg / cm ² . Measure it through the candle holes.

Also, the cause can be found in the nozzles. During the operation of engines on poor-quality fuel, the injectors wear out badly. First, the control valve is depressurized, and then the tip of the injector is reclaimed.

Also it is necessary to inspect the injection pump. Each element of the pump and the injection system are generally subject to severe wear and tear. If the motor starts up badly and the starter needs to be turned for a long time, it will be superfluous to check the pump.

It would be superfluous to check and candles. They do not have large dimensions and are often hidden behind the motor. If one or more of the spark plugs is out of order, the motor will not start in the cold. It is necessary to replace the candles. This is a typical reason why the car is badly started on a cold one. But for a better start it's worth buying a preheater.

So, we found out the main reasons why the car does not start.