Gas Surge Phenomenon in Cars: Effects, Causes & How to Handle It

Car station is a condition in which the engine's rpm increases abnormally, even when the driver does not step on the accelerator or steps on the accelerator very lightly. This condition causes discomfort to the driver, consumes fuel and poses many potential safety risks.

Gas explosion phenomenon (Sudden Unintended Acceleration – SUA) is one of the most serious technical failures in the automotive industry, which can directly threaten the lives of drivers and other road users.

According to statistics from the Vietnam Register in 2024, about 15-20% of serious accidents involving cars are caused by throttle control system failures, of which the phenomenon of throttle surge accounts for a significant proportion.

This article will provide a comprehensive look at the phenomenon of throttle burst, from the operating mechanism of the engine control system to emergency handling measures. Let's refer to it!

What is the phenomenon of gas explosion?

The phenomenon of runaway engine, or “runaway engine”, occurs when the engine speed increases suddenly and uncontrollably, often exceeding the normal speed when the vehicle is stationary (idle speed) of about 800-900 rpm, and can even reach 3000-4000 rpm or higher. This phenomenon causes the vehicle to accelerate suddenly, making it difficult for the driver to control and can lead to accidents.

1. Signs of a car with a stalling engine

Recognizing the signs of a seizure early is key to handling the situation safely. Common signs include:

• Abnormally high engine rpm: The tachometer needle suddenly jumps high without any action on the accelerator pedal. For example, when the car is in idle mode, the engine rpm is usually at 800-900 rpm, but when the throttle is overloaded, this number can exceed 2000 rpm.
• Automatic acceleration: The vehicle moves faster without the accelerator being pressed, or accelerates more forcefully than the accelerator is pressed.
• Loud engine noise: The engine makes a louder roar than usual, due to the increased engine speed.
• Difficulty controlling the vehicle: The driver finds it difficult to slow down or stop the vehicle.
• Stuck accelerator pedal: In some cases, the accelerator pedal can get stuck, leaving the driver unable to control the speed.

2. Classification of gas explosion phenomenon

Gas explosions can be classified based on the cause:

• Throttle misfire due to mechanical system failure: Related to mechanical components such as stuck throttle, tangled throttle cable, or problems related to the idle air control valve.
• Electrical system malfunction: Related to faulty sensors, ECU (Electronic Control Unit), or electrical circuits. For example, a faulty throttle position sensor (TPS) can send an incorrect signal to the ECU, causing the throttle to malfunction.
• Throttle misfire due to software error: In modern vehicles, software errors in the ECU can also cause throttle misfire.

3. Distinguish gas explosion from other phenomena

It is necessary to distinguish the phenomenon of gas explosion from some other phenomena to have appropriate handling:

• Normal acceleration: When the driver actively steps on the gas pedal, the car will accelerate. This is a normal phenomenon, not a sudden acceleration.
• Slope: When a vehicle is moving downhill, it may automatically accelerate due to gravity. This phenomenon is not related to throttle.
• Transmission Problems: A faulty transmission can cause the vehicle to move at a speed that is not intended, but not to accelerate. For example, if the transmission is stuck in a certain “gear,” the vehicle will move faster than normal.

What are the harmful effects of gas explosion?

The phenomenon of gas explosion has many potential risks, not only directly threatening traffic safety but also affecting vehicle operation and life.

1. Causes unsafe driving

The phenomenon of sudden acceleration causes the vehicle to accelerate suddenly, beyond the driver's control. This is especially dangerous in complex traffic situations, such as when moving in crowded urban areas, on highways, or when parking.

For example, a car that overshoots could hit pedestrians, other cars, or public structures, causing a serious accident.

2. Affects the engine and other parts

Not only is throttle surge a safety hazard, it can also negatively impact the engine and other vehicle components. When engine rpm increases suddenly, components such as pistons, crankshafts, and valves can be overloaded, leading to rapid wear or failure.

For example, running the engine at too high a rpm for a long time can reduce the life of the engine, even causing serious damage such as bent connecting rods, broken pistons. In addition, the transmission system, braking system, and cooling system can also be affected.

What causes gas explosion?

There are many causes of throttle failure, from problems related to the mechanical system, fuel system, electrical system, to other causes.

1. Causes related to the throttle system

The throttle system plays an important role in controlling the amount of air entering the engine. Throttle-related problems can cause throttle surge. For example:

• Stuck Throttle: The throttle can get stuck in the open position, causing a sudden increase in air intake into the engine, causing a surge. This can be caused by dirt, debris, or worn mechanical parts.
• Tangled or Jammed Throttle Cable: The throttle cable connects the accelerator pedal to the throttle. If the throttle cable is tangled, jammed, or worn, it can cause the throttle to open too far, causing a surge.
• Idle Air Control Valve (IACV) Fault: The IACV regulates the amount of air entering the engine when the vehicle is idling. If this valve fails, it can cause the engine to run at an abnormally high rpm.

2. Causes related to the fuel system

The fuel system supplies fuel to the engine. Some problems in this system can also cause misfire. For example:

• Faulty fuel injector: The fuel injector is responsible for spraying fuel into the combustion chamber. If the injector is faulty, it can spray too much fuel, causing the engine to accelerate unintentionally.
• Faulty fuel pump: The fuel pump supplies fuel to the engine. If the fuel pump fails, it can supply too much fuel, causing over-throttle.

3. Causes related to the electrical system

The electrical system plays an important role in controlling the operation of the engine. Faults in the electrical system can also lead to throttle failure. For example:

• Faulty Throttle Position Sensor (TPS): The TPS sensor sends a signal about the throttle position to the ECU. If this sensor is faulty, the ECU may receive incorrect information, leading to throttle oversteer.
• Faulty ECU: The ECU is the brain of the engine control system. If the ECU is faulty, it can control the throttle and other components incorrectly, causing throttle misfire.
• Shorted wiring: Shorted wiring can cause false signals, affecting engine performance and leading to stalling.

4. Other causes

In addition to the above causes, a number of other causes can also cause gas, including:

• Floor mat stuck in accelerator pedal: Some cases of stalling occur when the floor mat slips and gets stuck in the accelerator pedal, preventing the accelerator pedal from returning to its original position.
• Software error: For new car models, software errors in the engine control system can also cause throttle surge.
• Mechanical problems: Other mechanical problems such as weak accelerator pedal springs, or worn throttle system components, can also cause throttle misfire.

How to deal with a car that is out of gas?

Correctly handling a stall is key to safety. This section will provide detailed instructions on how to handle a stall, from emergency steps while the vehicle is running to preliminary checks.

1. Emergency steps when the vehicle is running

When your car stalls, it is important to stay calm and act quickly. Here are the emergency steps to take while your car is moving:

• Hold the steering wheel firmly: Grip the steering wheel firmly with both hands to maintain control of the vehicle's direction.
• Do not brake suddenly: Avoid sudden braking as it can cause the vehicle to lose control or cause a series of collisions.
• Lift off the accelerator: Immediately lift your foot off the accelerator pedal to cut off the fuel supply to the engine.
• Shift to N (Neutral): For automatic transmission vehicles, shift to N (Neutral) to disconnect the engine from the wheels. For manual transmission vehicles, depress the clutch to disconnect.
• Brake slowly: Use the brakes slowly and gently to reduce the speed of the vehicle.
• Find a safe place to stop: If possible, try to pull over to a safe place, away from vehicles and pedestrians.
• Turn off the engine: After stopping the vehicle safely, turn off the engine to prevent further stalling.

2. Preliminary check

Once you have resolved the gas leak, perform a preliminary check to determine the cause of the problem. Check the following components:

• Accelerator Pedal: Check to see if the accelerator pedal is stuck or obstructed by the floor mat.
• Throttle Cable: Check the throttle cable for tangles, kinks, or wear.
• Throttle: Check to see if the throttle is stuck in the open position.
• Idle Valve: Check that the idle valve is operating properly.
• Sensors: Check sensors related to the engine control system, especially the TPS sensor.

If you are not confident, take your car to a reputable garage for inspection and repair.

3. Important Note

Do not attempt to repair it yourself if you are not experienced; take the vehicle to a reputable service center for professional inspection and repair.

Measures to prevent gas explosion

Prevention is always better than cure. Following these precautions will help reduce the risk of a gas explosion.

1. Periodic maintenance

Regular vehicle maintenance is one of the most important ways to prevent breakdowns. Regular maintenance helps to detect potential problems early and prevent them from developing into serious problems. Maintenance tasks should include:

• Check and clean the throttle: The throttle needs to be checked and cleaned periodically to remove dirt and deposits, ensuring smooth operation.
• Check the throttle cable: The throttle cable should be inspected for tangles, kinks, or wear.
• Check the idle valve: The idle valve needs to be checked for proper operation.
• Check the sensors: Sensors related to the engine control system need to be checked periodically to ensure they are functioning properly.
• Change oil and air filter: Regular oil and air filter changes help ensure good engine performance and avoid fuel system problems.

2. Choose quality spare parts

Using quality spare parts is very important to ensure the safety and durability of the vehicle. Do not use poor quality spare parts of unknown origin, as they can cause problems, including throttle failure.

3. Safe driving habits

Safe driving habits also play an important role in preventing stalling. Drivers should:

• Don't accelerate too hard: Accelerating too hard can put stress on the throttle system and increase the risk of stalling.
• Check the vehicle before driving: Before driving, you should do a preliminary check of the parts related to the throttle system, including the accelerator pedal, throttle cable, and throttle butterfly.
• Drive carefully: Always drive carefully, obey traffic laws, and keep a safe distance from other vehicles.

FAQ – Frequently asked questions about gas explosion

1. Is gas dangerous?

Gas gushing is a very dangerous phenomenon that can lead to serious accidents if not handled properly.

2. Does throttle affect engine life?

The phenomenon of throttle surge can affect the life of the car engine if it occurs frequently or is not fixed promptly. You can refer to the article: 5 car engine health warning signals & things to know.

3. Should I buy a used car that has had a bad engine?

Should not buy used cars have been in a panic if not knowing the cause and severity of the problem.

4. Where can I find a professional car gas leak repair service in Ho Chi Minh City?

Thanh Phong Auto, with over 10 years of experience in the field of car repair and maintenance, is one of the leading prestigious addresses in Ho Chi Minh City. We specialize in handling complex technical errors, including the phenomenon of throttle burst - a common problem but with many potential risks to the safety and performance of the vehicle.

At Thanh Phong Auto, we provide comprehensive repair services with professional processes:

• Accurately diagnose the cause: Use modern machinery to check related systems such as throttle, TPS sensor and ISC valve.
• Fast and effective repair: Our team of experienced technicians will thoroughly handle the causes of gas leaks, from gas cleaning to replace damaged parts.
• Genuine spare parts commitment: All replacement parts have clear origin, ensuring high quality and durability.
• Long-term service warranty: Customers enjoy post-repair warranty, providing absolute peace of mind.

In addition, Thanh Phong Auto also stands out with its dedicated service attitude. We always carefully advise on the vehicle's condition and the most suitable repair options. In particular, customers often appreciate the transparency in quotes and service quality here.

If your car is experiencing a sudden acceleration or any other problem, come to Thanh Phong Auto in District 7 or Nha Be to receive the best support. With a team of skilled workers and modern equipment, we are confident in providing the optimal solution for your "beloved car"!