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

10. Bad Spark Plugs (Petrol Engine)

Spark plugs are an important component of a vehicle’s internal combustion motor. After the ignition coil sends an electrical signal to the spark plugs, they transmit that signal to the combustion chamber so that its air & fuel mixture can be ignited by an electric spark. If the spark plugs were to ever fail, then the engine’s performance would diminish and eventually fail altogether.

Read also: Causes of Car High Fuel Consumption in Diesel and Petrol Engines

11. Bad Ignition Coil (Petrol Engine)

The ignition coils of the ignition system serve as an electronic engine management element which is responsible for converting the 12 volts of power generated by the vehicle into 20,000 volts. This amount of voltage is needed in order to generate the electrical spark which can ignite the air & fuel mixture of the engine. If the ignition coil were to fail, then the vehicle would be unable to accelerate and its power would be lost.

Another Causes of Vehicle Poor Power

  • Bad Turbo charger
  • Bad EGR valve
  • Bad Injection pump delivery valve ( Conventional Diesel Engine)

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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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