Air filter can make a huge difference to your car’s performance. A clean and correctly installed air filter enhances fuel economy, increases engine life, lowers emissions and boosts acceleration. Impressive for a component that is frequently overlooked.
An internal combustion engine needs to mix approximately 10,000 litres of air with each litre of fuel in order to work. The air enters the engine via the air filter. Without proper air intake, the fuel mixture will be too fuel-rich so won’t burn properly and the engine will be starved of the oxygen it needs.
Most manufacturers recommend replacing your air filter every 19,000 km or every 12 months, whichever comes first.
When your car is idling or stationary, you should feel and hear the smooth vibrations of an efficient engine. If you notice unusual noises, in particular a coughing, popping or spitting noise, it suggests that the engine isn’t getting enough airflow, which means your air filter needs to be replaced.
What has actually happened in your engine is the air filter has become dirty.This reduces the airflow, changing the air-fuel mixture. The rich fuel mixture creates a black soot residue which covers the spark plugs. The noise comes from the spark plugs not firing properly due to this residue.
Decreasing fuel economy is a clear sign of a dirty air filter. A dirty air filter restricts air flow, lowering the oxygen in the mixture. Your engine compensates for this by consuming more fuel to produce enough power to move the same distance or speed as you could with a clean filter.
An insufficient air supply means your engine will be running on a fuel-rich mixture, which won’t burn completely before it enters the exhaust to leave the car as a black soot-like residue. This residue can be seen as black smoke.
If you smell petrol when starting the car, it’s because insufficient air is entering the fuel injection system and the excess unburnt fuel exits the car through the exhaust pipe.
A brand new air filter is a white / off-white colour, which will slowly darken as it accumulates dust and dirt over time. A visual inspection of your air filter under bright light will show a lot of dirt.
An inadequate supply of air can result in carbon deposits accumulating in the engine, which will eventually trigger your check engine light. If the light comes on, check your air filter to see if it needs replacing before you run other diagnostics.
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