desan Posted November 11, 2019 Share Posted November 11, 2019 I am getting a humming sound coming from the air filter box when i take out the air filter, the sound gets louder when i rev the car, but when i put the filter back the sound goes away. Can anyone help me? I am driving a 2007 ford focus 1.6i duratec hatchback car Quote Link to comment Share on other sites More sharing options...
Luke4efc Posted November 11, 2019 Share Posted November 11, 2019 Well if it doesn't happen with the air filter fitted then what's the problem? Why are you running the engine without one anyway haha Quote Link to comment Share on other sites More sharing options...
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