The situation when a car with an automatic transmission refuses to start often takes the driver by surprise. The question arises especially acutely if the cause of the breakdown is a faulty starter or a discharged battery that is unable to spin the engine. Mechanical owners know that you can try to start the car “from the pushrod”, but with automatically things are more complicated due to the design features of the transmission.
However, there are proven methods for starting the engine that can help in an emergency. It is important to understand that an automatic transmission does not have a tight connection between the wheels and the engine when parked, which makes the classic towing method risky. Starting is possible only if the torque converter is in good condition and there is a minimum pressure in the oil system. Before starting any manipulations, it is necessary to assess the state of the system and understand whether the game is worth the candle.
In this article, we will analyze in detail the mechanics of the process, explain why standard methods may not work, and provide a step-by-step algorithm of actions. You will learn about the risks that the gearbox faces when starting this way and what precautions need to be taken. Ignoring technical nuances can lead to expensive repairs, so carefully study the theoretical part.
The principle of operation of the automatic transmission and the role of the starter
To understand whether it is possible to start a car without a starter, you need to understand the physics of the process. Unlike a manual transmission, where the clutch rigidly connects the engine to the input shaft when the pedal is depressed, in automatic This function is performed by the torque converter. It transmits torque through fluid (ATF) rather than through direct mechanical gearing.
The starter in this system is necessary to create the primary rotation of the crankshaft. Without it, the pistons do not make strokes, and the mixture does not ignite. When you try to start the engine by towing the wheels through the differential and the output shaft, they try to spin the torque converter turbine. However, if there is no oil pressure in the system, which is created by the pump only when the engine is running, a tight connection does not occur.
It is believed that at high speeds, the fluid in the torque converter creates sufficient pressure to transmit torque. This is partially true for older 3-4 speed automatic transmissions, but modern 6-8 speed units have a complex system of locking and clutches. Electronics modern cars often block starting if they do not see a signal from the crankshaft position sensor or if the voltage in the on-board network is critically low.
⚠️ Attention: An attempt to start a car with an automatic transmission by towing at a speed above 50 km/h can lead to destruction of the internal elements of the box due to lack of lubrication and overheating.
In addition, the ignition system plays an important role. Even if you manage to rev the engine to the required speed, a spark may not appear if the battery is completely “dead”. The starter is needed here not only for rotation, but also as an indicator that the electrical circuit is closed and ready to work.
Towing method: step by step instructions
If you decide to take a risk and try to start the car with the help of a towing vehicle, you must act strictly according to the algorithm. This method is only suitable for cars with classic torque converter. CVTs (CVT) and robotic gearboxes (DSG, PowerShift) are absolutely impossible to start in this way - this is a guaranteed death of the transmission.
First of all, make sure that the automatic transmission selector is in neutral position. N. The towing vehicle should accelerate your car to a speed of 30-40 km/h. At this speed, the torque converter is partially filled with oil and pressure is created. After reaching the desired speed, it is necessary to sharply but smoothly move the lever to the position D (Drive).
At the moment of switching, the engine should begin to rotate. As soon as you feel that the engine has “grabbed”, immediately depress the brake and switch back to Nso as not to rest against the towing vehicle's bumper. Let the engine idle to allow the oil pump to fill the system.
☑️ Check before towing
The automatic transmission pump does not work, and the rubbing parts (planetary gearboxes, clutches) are left without lubrication. The towing time should not exceed 1-2 minutes, and the distance should not exceed 1 kilometer. If the first attempt fails, repeating the procedure more than twice is not recommended.
Push launch: is it possible?
Many drivers wonder whether it is possible to start an automatic machine if it is pushed manually or with the help of another car, applying force to the body. The answer is clear: to fully start the engine from a standstill, push useless. The speed that people can develop (5-10 km/h) is absolutely not enough to create pressure in the torque converter.
There is a myth that if you push the car downhill, the chances increase. Indeed, gravity will help you gain speed, but the risk of uncontrolled acceleration and loss of control in such a situation is too great. In addition, to engage the gear D a running machine often requires a working solenoid that is powered by the battery.
If the battery is completely discharged, the electronics may simply prevent you from engaging the gear. In this case, pushing turns into meaningless exercise. The only time pushing makes sense is to move the vehicle to a safe location to call a tow truck or connect an external power source.
⚠️ Warning: Pushing an automatic transmission vehicle manually is ineffective and can cause injury due to the sudden jerk when attempting to engage the gear.
For comparison, in a manual transmission it is enough to turn the wheels a couple of revolutions to turn the crankshaft. In an automatic transmission, this path lies through the liquid, which at low speeds behaves like a soft cushion that absorbs force rather than transmitting it.
Risks and consequences for transmission
Before you decide to start without a starter, evaluate the possible consequences. The main enemy of an automatic transmission when starting this way is the lack of lubrication. The oil pump is located on the input shaft and starts working only when the engine is already running or when the wheels are spinning the shaft at high speed.
When towing “cold” (without oil pressure), dry friction of parts occurs. This leads to rapid wear of friction discs, bearings and bushings. In modern complex gearboxes, the gaps are minimal, and any violation of the lubrication regime can cause scuffing, which subsequently leads to vibrations and noise.
In addition to mechanical damage, hydraulics also suffer. A sudden surge in pressure when engaging a gear while driving can damage the piston seals or cause rupture of the pipes. Repairs after such a start are often more expensive than replacing the starter or buying a new battery.
What happens inside the box when starting from a pusher?
When gear D is engaged at speed, the oil in the torque converter begins to circulate, but the pump has not yet created full pressure. The clutches close with a jerk, which causes a shock load on the entire transmission. If the engine starts, the pressure returns to normal, but the first seconds of operation are “dry”.
It is also worth considering the condition of the engine. If the starter does not turn due to the engine wedge, then any attempt to start the car with a pusher will lead to destruction of the piston group or breakage of the connecting rod. Therefore, first make sure that the engine can be cranked by hand (at least partially).
Table: Comparison of launch methods
For clarity, let's compare different methods of starting an engine with an automatic transmission. This will help you choose the least risky option based on your situation.
| Method | Efficiency | Risk for automatic transmission | Prerequisites |
|---|---|---|---|
| Towing with a rope | Average | High | Availability of towing vehicle, speed 30+ km/h |
| Pushing with hands | Low | Medium | Helpers, smooth road (ineffective) |
| Starting device (Booster) | High | Missing | Availability of a booster or second battery |
| Starter replacement | High | Missing | Availability of tools and skills |
As can be seen from the table, the safest way is to use an external power source. If the problem is in the starter, then applying voltage directly to the solenoid terminal (while observing safety precautions) can briefly revive the system, but this requires the skills of an auto electrician.
The towing method remains an “emergency” option when there are no other options and you only need to drive a couple of kilometers to the nearest service station. In other cases, it is better not to tempt fate and use the services of a tow truck.
Alternative solutions and prevention
Instead of risky experiments with towing, consider more civilized methods. Portable jump starters (boosters) today are affordable and take up little space in the trunk. They make it easy to start the car even with a completely dead battery and a faulty starter (if there is a minimum voltage for a spark).
If the starter fails mechanically (for example, the bendix is jammed), sometimes gently tapping it with a pry bar or wrench helps. This may temporarily free up stuck parts and allow the starter to spin a few times, enough to start. But this is a temporary measure that requires immediate repair.
Always keep a set of wires for “lighting up” and a powerful screwdriver in the trunk - sometimes it helps to close the contacts of the solenoid relay if the contact group of the ignition switch is burned out.
Regular diagnostics of the starting system will help you avoid troubles on the road. Check the condition of the terminals, belt tension and battery charge level. Remember that a serviceable car is the key to your safety and the safety of your expensive automatic transmission.
The best way to start an automatic without a starter is to use a booster or replace the starter on site. Towing is a last resort with a high risk of box failure.
Is it possible to start a CVT from a pushrod?
No, absolutely not. CVTs have very sensitive hydraulics and a belt drive. Starting from a pusher is guaranteed to cause the belt to slip and damage the cones. Repairs will be very expensive.
How long can you tow a car with an automatic transmission?
Without a running engine and lubrication pump - no more than 1-2 minutes and at a distance of up to 1 km. Long-term towing is only possible with the driveshaft disconnected or on a tow truck.
Will changing the automatic transmission oil help with starting problems?
No, changing the oil will not solve the starting problem if the starter does not turn over or the battery is dead. However, fresh oil will improve the performance of the torque converter when attempting to tow start.
Why doesn't the car start even though the starter turns?
The reasons may be the absence of a spark, problems with the fuel supply, low compression or faulty sensors (crankshaft, camshaft). In this case, the towing method will not help either.