11 Causes of Car Losing Power When Accelerating (Diesel & Petrol Engine)

If you are driving your car and notice that you are losing power as you accelerate, there can only be one of two reasons for this. Either you do not have enough fuel in your vehicle or you do not have enough power. And there are many reasons why your vehicle losing the POWER especially when accelerate, some common causes are:

  • Mechanical problems such as: Low compression, Clogged fuel filter, Dirty air filter, Clogged Exhaust Manifold
  • Malfunction of Sensors such as: camshaft position sensor, MAF sensor, Oxygen sensor, Crankshaft sensor and all sensor relative to the EFI system.
  • Malfunction of Actuators such as: Bad injectors, bad fuel pump, bad spark plugs

11 Causes of Car Poor Power When Accelerating in Diesel & Petrol Engine

There are little different causes between diesel and petrol engine. For more information, please see 11 possible causes below:

1. Low Compression (Diesel & Petrol Engine)

In order for a car’s engine to function properly and provide adequate power to the vehicle, there must be great cylinder compression throughout the combustion process. If the compression is low, then the power of the engine will be low. The result will be an engine that does not function properly.

2. Clogged Fuel Filter (Diesel & Petrol Engine)

The fuel filter is located in between the fuel injectors and fuel pump of your vehicle. The job of the fuel filter is to screen the gasoline for any impurities which may exist in it. That way, when the fuel pump sends the gasoline into the engine, those impurities won’t be there. The fuel filter is literally a barrier between the contaminants in the gasoline and the engine of your vehicle. If you were to have a dirty fuel filter or one that couldn’t perform its job properly because it’s damaged or clogged, then those contaminants would find their way into the engine. Once that happens, the engine will eventually lose its power and the overall functionality of the vehicle will be impaired.

3. Bad Air Filter (Diesel & Petrol Engine)

The internal combustion chamber of an engine is responsible for mixing gasoline and air together in order to generate the power that is needed to run your vehicle. Before the air can enter the chamber, it must pass through an air filter that screens out bugs, debris, and other kinds of impurities that may exist in it. If these impurities were to get into the engine, they would damage it immensely. However, air filters tend to get clogged after they’ve been used for a while. Once an air filter gets clogged, it will limit the amount of air that can get into the internal combustion chamber. This will negatively impact the functionality of the vehicle because the engine won’t be able to generate a sufficient amount of power to run the car.

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2 thoughts on “11 Causes of Car Losing Power When Accelerating (Diesel & Petrol Engine)

  1. Hello, my stepvan with a diesel MWM international engine is failing when you hit the gas pedal. What could be the cause?
    The truck was sitting at a storage for 3 or 4 months.

    1. It can be learning value memory in your engine ecu is deleted due to no power source. Just make initialization, start engine warm up than drive vehicle for more than 30 minutes.


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