Why Does My Car Accelerate Slowly?

Written by cathryn whitehead
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Why Does My Car Accelerate Slowly?
Dirty, plugged or worn parts can cause a car to accelerate slowly. (speed image by kuhar from Fotolia.com)

When a car accelerates slowly, something is affecting the correct mixture of oxygen and fuel that allows your engine to operate at peak efficiency. A number of faulty parts can cause this hesitation.

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Fuel System

A plugged fuel filter, air filter or fuel pump can cause your car to accelerate slowly. A damaged or dirty carburettor -- or dirty fuel injectors that aren't properly mixing the fuel with air -- might contribute to slow acceleration.

Electrical System

Faulty spark plugs might fail to ignite your car's mixture of oxygen and fuel; this can cause your car to accelerate slowly. Worn or damaged spark plug wires interfere with spark plug ignition.


Dirty or worn computer sensors in the engine might cause delayed or slow acceleration. Sensors functioning improperly fail to detect and send correct information to your vehicle's various systems.

Exhaust System

A catalytic converter removes harmful emissions from the tailpipe. These emissions back up and interfere with the flow of fuel and air when the converter is plugged or damaged.

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