12 Reasons Why A Car Loss Power While Driving

When a car engine is running, it uses a fuel-air mixture to create power through combustion. This power is then transferred to the transmission, which enables the vehicle wheels to turn. However, if a vehicle experiences a loss of power while driving, there are various major causes to consider. This article explains the causes for why a car lose power when accelerating. 

car lose power while driving

The efficient working of a vehicle relies on the proper supply of fuel, air, and compression. An issue with this process can lead to a noticeable decrease in power.

However, there are numerous issues that can affect power output; certain common factors often contribute to slower performance on the road. Here, we are going to deeply discuss the possible causes of engine power loss while driving.

Causes of Engine Power Loss When Accelerating

Experiencing a loss of car power while driving can be quite frustrating, but fortunately, it doesn’t necessarily have to be a permanent problem. By adhering to regular maintenance and servicing routines and incorporating Redex fuel additives into your routine, you can effectively prolong the optimal performance of your engine.

Your car engine may lose power when accelerating due to one or more of the below-given reasons:

1) Clogged Fuel Filter

A clogged or faulty fuel filter is one of the major reasons why your engine power is lost while driving. If you press the accelerator pedal and don’t experience the expected response, there may be something with the fuel system.

Fuel Filter, causes of car lose power while driving

One of the primary causes of low engine power is often a clogged fuel filter. The role of the fuel filter is to prevent dirt and debris from entering the fuel system, but over time, it may require cleaning or replacement.   

A clogged fuel filter puts additional strain on the fuel pump, leading to reduced efficiency while driving. Consequently, you may struggle to obtain the necessary power for tasks like overtaking or driving uphill.

While a clogged fuel filter is the most common fuel system issue and relatively easy to address, a loss of power can also indicate problems with the fuel pump or fuel line.

Read More: Clogged Fuel Filter Symptoms and Causes

2) Clogged Air Filter

For an engine to operate effectively, it requires clean air intake. Contaminants and dust may potentially damage the engine cylinder, filters, and fuel injectors. Therefore, it is important to ensure the air entering the system is free from impurities. To achieve this, your vehicle has an air filter located just before the throttle body.

Air Filter

When the throttle opens, the air is drawn in and flows through the air filter, which removes contaminants from the air and properly cleans it.

Over time, the air filter becomes worn out, typically after several thousand miles. When these filters go bad, they badly affect the engine performance. To maintain optimal performance, it is recommended to replace the air filter during routine oil changes.

3) Clogged Catalytic Converter

The catalytic converter is one of the major parts of your vehicle. It plays a crucial role in eliminating hazardous and useless gases generated by the engine. The quicker these gases are expelled, the faster the engine can commence the combustion process again.

Catalytic Converter Location

Thus, if the exhaust system encounters any obstruction, such as a clogged catalytic converter or exhaust pipe, it can result in a loss of power for the engine.

Read More: Bad Catalytic Converter Symptoms and Causes

4) Bad MAF Sensor

The Mass Airflow (MAF) Sensor of your car is responsible for measuring the amount of air required by the vehicle’s engine to operate. This data is then relayed to the engine control module (ECM), which adjusts the throttle accordingly.

MAF Sensor, mass air flow sensor

When the MAF sensor goes bad, it can result in a significant power lose of the vehicle engine when accelerating as it fails to accurately measure the airflow. Over time, engine sensors can deteriorate due to heat and contaminants. Regular cleaning of the MAF sensor can help enhance its performance.

Read More: Bad MAF Sensor Symptoms and Causes

5) Bad Oxygen Sensor

The MAF sensor of your vehicle works in conjunction with the O2 sensor, which calculates the exhaust gases. The oxygen sensor is typically installed in the exhaust pipe. When the readings of your MAF sensor align with the O2 sensor readings, it indicates that the vehicle is operating optimally.

Oxygen Sensor, reasons why engine lose power while accelerating

The O2 sensor of your also plays a crucial role in the fuel injection system and ensuring optimum engine performance. Therefore, it is essential for it to function properly to ensure smooth engine operation.

A malfunctioning oxygen sensor may force the engine to run too rich or too lean, resulting in a loss of engine power during acceleration.

6) Bad Fuel Injectors 

A fuel injector plays a crucial role in the combustion process by injecting proper fuel into the combustion chamber. The fuel injectors operate under high pressure, spraying a precisely calculated amount of fuel for efficient combustion.

bad fuel injector

Even a minor miscalculation in the fuel injection may disrupt the combustion cycle, leading to a loss of power and potentially causing damage to components like pistons or cams.

Read More: Bad Fuel Injector Symptoms and Causes

7) Air Conditioning Draining Power

Car Air Conditioner

It’s important to note that the air conditioning system in your car draws power from the engine. Hence, on hot days when the air conditioning is in use during a long journey, you may perceive a reduced pulling power or performance compared to what you normally expect.

8) Faulty Spark Plugs

The spark plug is one of the most important parts of the petrol engines. It plays a crucial role in ensuring the proper combustion of the air-fuel mixture. It generates the spark needed for air-fuel mixture combustion inside the engine cylinder. Without functioning spark plugs, a car cannot run at all.

Bad Spark Plug

While rare, bad spark plugs may also contribute to power loss in certain situations. Typically, worn spark plugs become evident when your car misfires. If your vehicle engine sounds different than usual, it could indicate a worn-out spark plug, causing the engine to run on fewer cylinders than normal.

Read More: Bad Spark Plug Symptoms and Causes

9) Poor Cylinder Compression 

The engine cylinders of your vehicle must maintain a tight seal to effectively contain the combustion explosions. This principle is crucial for the engine’s operation.

Compression Loss

When the compression rate is high, the power produced from the explosions is fully utilized to move the piston. However, if any of your vehicle’s cylinders is leaked, it may lead to a reduction in the compression rate.

In simpler words, a cylinder with a leak fails to compress the explosion properly, resulting in a loss of power that is not fully shifted to the wheels. This directly affects acceleration and can lead to a noticeable power loss.

10) Faulty Turbocharger

Turbo engines have become increasingly common in modern vehicles, as they boost power by improving air pressure in the combustor. This allows for a greater amount of fuel to be added, resulting in more powerful explosions within the cylinders.

While the turbocharger also enhances the engine’s efficiency. But any issues with the turbochargers can lead to engine power loss while accelerating.

There are different issues related to turbochargers ranging from the presence of dirt or debris causing mechanical issues to the detrimental effects of a hole or loose connection in the tubing.

Adequate maintenance of oil levels and the oil filter is crucial for optimal turbocharger performance since turbos rely on oil for effective operation.

11) Faulty Fuel Pump

The fuel pump of your vehicle is responsible for supplying fuel from the fuel tank to the engine. It plays a vital role in ensuring sufficient engine power. It needs to generate sufficient pressure to ensure the fuel injector can spray the correct amount of fuel into the combustion chamber.

Bad Fuel Pump

If the fuel pump’s pressure is too low, it can result in an inadequate fuel supply, leading to engine power loss.

While a bad fuel pump may not cause noticeable issues at low speeds, it can significantly impact acceleration and power delivery. Typically, a fuel pump has a long lifespan. Therefore, checking the fuel pump should not be the first troubleshooting step in addressing power loss concerns.

Read More: Bad Fuel Pump Symptoms and Causes

12) Damaged Timing Belt or Chain

Damaged timing belt

Although timing belt issues are comparatively uncommon. However, poor maintenance, incorrect tension, or incorrect installation of the timing belt may lead to the opening and closing of the engine valves at the wrong intervals. This may lead to engine power loss, often accompanied by a knocking noise emanating from the engine.

Read More: Bad Timing Belt Symptoms

How to Prevent Engine Power Loss

Although completely avoiding engine faults is not possible, but there are different measures you can take to minimize the chances of experiencing decreased performance and power. By implementing certain practices, you can effectively decrease the possibility of encountering such issues.

Here are some essential steps to maintain your car’s power and performance:

  • Follow the manufacturer’s guidelines and get your car serviced at least once a year.
  • Use Redex fuel additives to keep the fuel system clean and prevent blockages caused by dirt and deposits.
  • Address any dips in performance promptly. The sooner you fix a problem, the less long-term damage it can cause.
  • Regularly check the air filter for blockages and buildup. Conducting small checks yourself can be beneficial in the long run.
  • Stay attentive to the general condition of the engine, including regular inspections of coolant/antifreeze levels and oil.

FAQ Section

Can bad spark plugs cause power loss?

While defective spark plugs can indeed lead to power loss in an engine. When the spark plug of your vehicle fails to fire properly, it can result in decreased power output and inefficient engine operation. Therefore, if you notice a loss of power, it is recommended to inspect the condition of your spark plugs as they could be a potential cause.

How do I check if my fuel filter is clogged?

There are multiple methods to check a clogged fuel filter. One approach is to visually examine the fuel filter. If the fuel inside appears dirty or shows signs of clogging, it is likely that the filter requires replacement. Another method to assess the state of the fuel filter is by checking the fuel pressure. If the fuel pressure measures below the usual range, it may indicate a potential clog in the fuel filter.

Does cleaning a MAF sensor work?

A malfunctioning MAF sensor, often caused by the buildup of dirt and debris, can lead to poor engine performance and sluggish acceleration. Cleaning the MAF sensor helps remove the accumulated gunk, allowing the sensor to function properly and restore optimal engine operation.

Can a dirty air filter cause reduced engine power?

While a dirty air filter may contribute to poor engine power. When the air filter becomes clogged with dirt, it blocks the air from entering the engine, leading to reduced engine power. To maintain engine performance, it is advisable to replace the air filter according to your vehicle’s service schedule.

Why does my car have no power when I accelerate?

Loss of engine power can be caused due to various mechanical and electrical issues. In some cases, addressing the problem may involve replacing the fuel injector, replacing the MAF sensor, replacing the bad PCV valve, replacing the spark plugs, or cleaning the distributor rotor. These maintenance tasks can help resolve underlying issues and improve engine power and performance.

Why does my car lose power when it gets warm?

High temperatures can lead to increased electrical resistance in circuits or components. If a part has a poor internal connection or is faulty, the rise in temperature can result in a voltage drop within the part. Additionally, heat may lead to issues with a failing crank position sensor, leading to power loss during acceleration and intermittent jerking sensations.

How do you fix the loss of power when accelerating?

To address the power loss, it is recommended to locate the fuel filter, which can typically be found in the engine bay or near the fuel tank in the car’s trunk. If your fuel filter is dirty, it should be replaced. If you possess the necessary knowledge, you can perform the replacement yourself, or you can have it changed by a professional mechanic.

What are the reasons of engine power loss?

  • Clogged fuel filter
  • Clogged air filter
  • Clogged catalytic converter
  • Bad MAF sensor
  • Bad Oxygen Sensor
  • Bad fuel injectors 
  • Air conditioning draining power
  • Faulty spark plugs
  • Poor cylinder compression 
  • Faulty turbocharger
  • Faulty fuel pump
  • Damaged timing belt
  • Bad MAP sensor
  • Bad PCV valve
  • Bad Thermostat

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