Cranking the starter without setting the engine at temperatures below -20°C most often indicates a critical discharge of the battery or thickening of the engine oil to a gel state. At this moment, the starter experiences a tremendous load, trying to turn the crankshaft under conditions of maximum resistance, which instantly drains the residual charge. If you only hear a quiet crackling sound from the solenoid relay or a sluggish hum, attempting to crank for a long time will only drain the electrolyte and can lead to freezing of condensate in the exhaust system.
Low ambient temperature radically changes the physical and chemical properties of working fluids and materials, making the standard startup algorithm inoperative.
The electrolyte in the battery banks becomes less conductive, and the viscosity of the lubricant in friction pairs increases significantly, requiring significantly more energy for the primary impulse.
That is why it is important to understand that a successful start depends not only on the serviceability of the starter, but also on the preliminary preparation of the vehicle’s energy system.
Preparing the Battery and Electrical System
The first step before starting in extremely cold conditions should be to check the condition battery. Even a fully charged device at a temperature of -25°C delivers only about 60% of its rated capacity, so a visual inspection of the terminals for oxidation and tightness is mandatory.
If the car has been parked overnight, experienced drivers recommend “waking up” the battery by briefly turning on the high beam headlights for 10-15 seconds before turning on the ignition. This technique triggers chemical reactions in the electrolyte, slightly increasing its temperature and reducing internal resistance, which provides the necessary power reserve for the starter.
⚠️ Attention: Never try to “light” a car if your battery is completely frozen (the case is swollen or cracks are visible). An attempt to charge or start the engine from such a source may result in an explosion and rupture of the housing.
Particular attention should be paid to the cleanliness of the contacts, since oxides create additional resistance, which in cold weather becomes a critical failure factor.
Using a pre-heater or at least keeping the battery warm significantly increases the chances of a successful start the first time.
Selection of engine oil and fuel system
The key factor determining the ease of turning the crankshaft is viscosity. motor oil at low temperatures. Synthetic formulations with an index of 0W or 5W remain fluid even in extreme cold, while mineral oils 10W-40 and higher turn into plasticine, blocking engine operation.
In diesel units, the situation is aggravated by the risk of fuel waxing, when diesel fuel solidifies in the lines and filters. The use of winter or arctic fuels, as well as the presence in the tank depressant additives, preventing the crystallization of paraffins, is a prerequisite for operation.
Gasoline engines are also sensitive to fuel quality, since condensate in the tank can freeze in the fuel rail or clot the fine filter.
To prevent the fuel system from freezing, regularly add a high-quality dehumidifier to the tank before each refueling during the winter.
If you plan to park for a long time in the cold, the fuel level in the tank should be maximum to minimize the formation of condensation on the walls.
Timely replacement of the fuel filter before the onset of cold weather also reduces resistance to fluid flow and facilitates the operation of the fuel pump.
Algorithm of actions when starting the engine
There is a practice that has been proven over the years to make the most efficient use of battery life during startup. First, you need to turn on the ignition for 5-7 seconds to allow the fuel pump to create the necessary pressure in the rail and warm up the glow plugs (for diesel engines).
After a pause, you can try to turn the starter, but the duration of one attempt should not exceed 10 seconds, otherwise the windings may overheat and the electrolyte may boil.
☑️ Starting procedure in cold weather
Between starting attempts, be sure to take a break of 30-40 seconds to allow the battery to restore its chemical potential.
For manual transmission vehicles, it is critical to depress the clutch pedal to disengage the engine and transmission so that the starter does not have to crank congealed oil into the transmission.
| Engine type | Action before the start | Scroll time | Interval |
|---|---|---|---|
| Gasoline (injector) | Turn on ignition (pump) | up to 10 sec | 30-40 sec |
| Diesel | Wait for the incandescent lamp to go out | up to 15 sec | 40-60 sec |
| Carburetor | Pump up gasoline manually | up to 10 sec | 30 sec |
| Gas (GBO) | Only on gasoline | up to 10 sec | 30 sec |
After a successful start, you should not immediately give high speeds; let the oil spread throughout the system during 1-2 minutes of idling.
A sharp increase in load on a cold engine can lead to scoring in the cylinders and accelerated wear of the liners.
What absolutely should not be done during a cold start
One of the most common mistakes is trying to “revive” a frozen car by endlessly rotating the starter. Long work starter in full load mode it leads to overheating, melting of the wires and a complete discharge of the battery to zero.
It is also dangerous to use an open flame to warm up the oil pan or intake manifold, as this can cause the plastic, pipes and the car itself to catch fire.
⚠️ Attention: It is forbidden to start the engine using a “starter” (booster) with a voltage higher than 12V (for passenger cars) or leave the wires connected longer than necessary to avoid a voltage surge and combustion of the electronics.
It is not recommended to sharply accelerate immediately after starting, until the oil has reached operating temperatures and has coated all rubbing parts.
Using ether sprays (“quick start”) without a clear understanding of the dosage can lead to water hammer or damage to engine sensors and seals.
Use of assistive aids and devices
The modern market offers many solutions to make life easier for motorists in winter, ranging from portable boosters (power banks) to stationary pre-heaters. Pre-heater, running on fuel from a tank or from the mains, is able to warm up antifreeze and oil to a comfortable temperature before you leave the house.
Autonomous interior heaters keep the cabin warm, but do not solve the problem of a cold engine, so their effectiveness for starting the engine is limited.
For emergencies, it is useful to have cigarette lighter wires with a thick copper cross-section in the trunk, which do not tan in the cold and can withstand high currents.
How to light a cigarette correctly
Connect the positive terminals of both batteries|Connect the negative terminal of the donor to the body of the receiving car|Start the donor and let it run for 5 minutes|Try to start a frozen car|Disconnect in reverse order
Electric motor blankets that plug into a 220V outlet are an excellent budget option for those who have the opportunity to park near a power source.
Insulating the engine compartment with special car blankets helps to retain heat longer after a trip, although their effectiveness during very long stops is debatable.
Prevention and car care in winter
To prevent the question “how to start a car in cold weather” from arising every morning, it is necessary to carry out seasonal maintenance in advance. Checking the density of the electrolyte and the state of charge of the battery at the load plug should become a mandatory procedure in November.
Replacing spark plugs before winter is also critically important, as insulator breakdown or increased electrode gap makes sparking much more difficult in cold air.
Monitor the condition of belts and pipes, which become brittle in the cold and can burst during a sudden start or engine vibration.
The main key to winter starting is a serviceable battery with an electrolyte density of 1.27-1.29 g/cm³ and oil with a low pour point.
Regular car washing, especially the underbody and arches, prevents the formation of ice jams in the wheels and freezing of the brakes.
Treating door seals with silicone grease will protect them from freezing and tearing when opening.
Is it possible to pour boiling water on the lock or engine?
You can pour boiling water on a frozen door lock, but with caution, since a sharp temperature change can damage the larva, and the water will quickly freeze again. It is strictly forbidden to pour water on the engine - this will lead to cracks in the cylinder block and head due to thermal shock.
How long does it take to warm up a car in winter?
Modern injection engines do not require long-term warm-up in place. 2-5 minutes are enough to stabilize the speed and start moving in a gentle mode. Prolonged warm-up at idle leads to the formation of carbon deposits and excessive fuel consumption.
Does charging the battery before starting help?
Yes, briefly turning on the headlights or music before starting starts chemical reactions in the battery, increasing its output current. This is a proven method of “activating” a battery in the cold.
What to do if the car starts and immediately stalls?
Most often this is due to snow adhering to the exhaust pipe, a malfunction of the throttle position sensor or idle air control. Check the exhaust system for ice blockages.