The situation when the turn of the ignition key leads only to a single click or coffin silence, and the engine with an automatic transmission does not give signs of life, is familiar to many motorists. If the starter fails, the standard “spin and go” algorithm stops working, putting the driver in a difficult position. Unlike mechanics, run the machine. gearbox (AV) from acceleration is more difficult, but under certain conditions and the presence of a serviceable engine it is possible.
Before proceeding to radical methods, you need to make sure that the problem lies in the traction relay or starter winding, and not in the discharged battery. Often drivers confuse these symptoms, trying to start the car in ways that will not help with a banal lack of voltage in the onboard network. If you know for sure that starter jammed or burned, and the engine is serviceable, there are proven methods of bypassing the start system.
It is important to understand that any start of the engine bypassing the standard system is stress for the power unit and transmission. The methods described below should only be used in emergency cases when it is urgent to deliver the car to the service or drive it to a safe parking lot. Do not consider these actions as everyday practice, as they carry certain risks for the future. hydrotransformer and other nodes.
Diagnostics of malfunction before launch
The first step should always be an accurate diagnosis. If a distinct click is heard when turning the key, but the crankshaft does not turn, this may indicate a bendix jamming or wear on the starter bushings. In some cases, the problem lies in oxidized contacts or weak current coming to the winding. Checking status battery-staff The weight of the engine is a mandatory procedure that cannot be ignored.
If the starter makes a long hum, but the engine does not turn, perhaps the teeth of the gear of the bendix or the flywheel crown are erased. In such a situation, attempts to start the engine can lead to even more serious damage to gears. Experts recommend visually inspecting the available parts of the launcher and listening to the sounds emitted by the unit when trying to launch.
Do not forget about the electrical component. A faulty ignition lock or a break in the control circuit can simulate a starter breakage. Making sure that the voltage on the launcher is, but there is no reaction, you can proceed to the methods of emergency start. Diagnostics It should be prompt but careful not to aggravate the situation.
Launch from the pusher: is it possible on the machine?
The question of whether it is possible to start the machine from a pusher is surrounded by many myths. Theoretically, to start the engine, it is necessary that the torque is transmitted from the wheels through the transmission to the crankshaft. In the case of gearbox This is achieved by a rigid bond when squeezed clutch. However, in the automatic communication between the input and output shafts is carried out through a hydraulic transformer and hydraulic pressure of oil.
While the engine is not running, the automatic transmission oil pump does not create the necessary pressure, and the frictions do not shrink. Consequently, the torque from the wheels simply won’t reach the engine in sufficient volume. Accelerating a heavy vehicle with a locked transmission to the speed at which pressure will arise in the system (usually about 30-40 km / h), is almost impossible by people or even towing on a short cable.
Why does the hydraulic transformer interfere with the start-up?
The hydraulic transformer transmits force only when there is a fluid flow. Without a running engine, the pump does not pump oil, and communication between the turbines is lost, making the transmission of torque impossible.
There is an exception for some older models or CVs where starting is structurally possible, but it requires very high speeds, dangerous for an unprepared transmission. Therefore, the classic method of "pushing" for most modern cars with a DISTRIBUTION It is considered unworkable and even harmful.
Starter's direct-circuit terminal method
The most effective and common way to start a car with a faulty starter (if the problem is with the control electrician, not the mechanical jamming) is to directly close the contacts. This method allows you to apply current directly to the starter winding, bypassing the ignition lock and retracting relay, if it is working but does not receive the signal.
To perform this procedure, you will need a wrench or a thick screwdriver with an insulated handle. It is necessary to find on the starter body two large copper contacts: one goes from the battery, and the second - directly to the windings of the engine. Short-circuiting these contacts will cause the starter to spark and scrolle.
- 🔧 Make sure the vehicle is neutral ()
N) and tighten the hand brake. - 🔋 Check that the battery is charged and the terminals are securely secured.
- ⚡ Find the nickels on the starter's retractable relay (usually two large nut bolts).
- 🛑 Be prepared for the appearance of a spark and a sharp jerk of the car.
⚠️ Attention: When the contacts are closed, a powerful electric arc occurs. Use only tools with high-quality insulation to avoid electric shock or burns. Do not touch the metal parts of the body!
If the starter is mechanically serviceable, but does not work due to a breakage of the ignition lock or wiring, this method will allow you to start the engine. However, if the starter is jammed mechanically, closing the contacts can lead to overheating of the wires or fire. Therefore, before the procedure, you should slightly tap the starter body to release the brushes or bendix.
Use of the launcher (Booster)
Often the reason why the starter can not turn the engine is not its breakdown, but a weak battery charge that is not able to provide the necessary starting current. In such cases, the use of a special launcher, or boosterIt can resuscitate the car without having to push it or disassemble the wiring.
The booster is a portable high-power lithium-polymer battery capable of delivering hundreds of amperes in a short time. Connecting it parallel to the standard battery, you add up the currents, which often allows the starter to turn the crankshaft even in the cold. This is the safest and most modern way to solve the problem.
☑️ Preparation for the use of the booster
It is important to observe polarity when connecting the booster. Incorrect connection can disable the electronics of the car or the launcher itself. Modern models are equipped with protection against overpole, but recheck connections before launch is a rule of good tone and safety.
Towing as a method of starting the engine
If direct start is impossible, and pushing the car is useless, there is a towing option. However, as mentioned earlier, it is a complex process for the machine. The chance to start the engine is only if the automatic transmission pre-add the oil to a level above normal (to create pressure by gravity) and accelerate the car to high speed, and then sharply turn on the transmission.
This method is extremely risky and is not recommended for modern cars. There is a high probability of damaging the frictions, cutting the slits or overheating the transmission fluid. However, in a desperate situation on older cars (for example, the car is not a good choice). Volvo or Mercedes In the 1990s, this method sometimes worked.
| Method | Effectiveness for automatic transmission | Risk of damage | Equipment required |
|---|---|---|---|
| Closing the terminals | High (if the starter is intact) | Medium (sparkling) | Screwdriver/key |
| Hand-pushing | Zero. | Low. | Assistants |
| Towing | Low/Mediocre | High-pitched | The cable, the other car. |
| Launcher | High (with discharged battery) | Minimum | booster |
If you still decide to tow, use a rigid clutch to avoid jerks that can destroy the transmission elements. The movement should be smooth, without sharp accelerations and braking. After successful start-up, do not shut down the engine immediately, let the lubrication system go into working mode.
Safety and precautions
Any manipulation of the vehicle’s launch system is risky. Rotating parts of the engine, high voltage and hot surfaces of the exhaust system require increased caution. Before starting work, make sure that the car is securely fixed and does not roll spontaneously.
Always keep a fire extinguisher handy when working with electricity under the hood, as the risk of short circuit and insulation fire is quite high.
Particular attention should be paid to clothing. It should not be too free to wind on the rotating elements (generator belt, pulleys) in the event of a sudden start of the engine. Remove metal jewelry and watches that may accidentally close contacts.
⚠️ Warning: If the starter is smoky or gnashing, stop trying to start immediately. Continued work can lead to fire wiring or destruction of the flywheel.
Remember that a successful engine start is only half the battle. If the starter is defective, it must be replaced or repaired as soon as possible. Operating a car with a broken start system can leave you in an unexpected place where help will not be available.
When a tow truck is required
There are situations when attempts to start a car on their own are not only useless, but also dangerous. If the engine is jammed mechanically (sometimes confused with a starter breakdown), any scrolling attempt will result in fatal damage to the cylinder block. A characteristic feature is the inability to turn the crankshaft even manually.
Also, don’t take risks if you’re not confident in your abilities or don’t have the tools you need. In modern cars with complex electronics, inept intervention can lead to failures in the engine control unit (see below).ECU). In such cases, it is more reasonable to use the services of a tow truck.
If after 2-3 attempts of safe start the engine did not start, further experiments may cost more than calling a tow truck.
Calling specialists is also justified if the car is on a busy road or in a dangerous place. The safety of the driver and passengers should always be prioritized over the cost of the evacuation or repair service.
FAQ: Frequently Asked Questions
Can I start the machine from the pusher if the battery is drained?
No, for cars with a classic automatic transmission, this method does not work. The hydraulic transformer does not transmit rotation from the wheels to the engine without the oil pressure that creates the pump associated with the running engine. Attempts to accelerate the car to speeds at which pressure may occur are dangerous for the transmission.
Is it safe to close the starter terminals with a screwdriver?
This is an acceptable emergency method, but it requires caution. The risk is the possibility of getting an electric shock, a burn from a spark or damage to the electronic control if there are voltage surges in the system. Use tools with high-quality insulation and act quickly.
Why does the starter click but not spin?
Clicking means that the retracting relay is triggered, but the starter is not rotating. Causes: battery discharged (lack of current), contacts oxidized, starter brushes worn out or mechanical jamming of the rotor / bandix occurred.
How much does it cost to replace a starter on the service?
The cost depends on the brand of the car and the difficulty of accessing the node. On budget cars, work can cost from 1500 to 3000 rubles, on premium cars - much higher. The starter itself also varies in price from 3000 to 20000+ rubles.
Can a faulty starter drain the battery?
Yes, if there is a short circuit in the windings or a retractable relay is jammed in a closed state, the starter can consume current even when the engine is turned off, quickly disembarking the battery.