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Cotton Air Filter

blackthornonehundred
blackthornonehundred
in Ford Focus Club

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Hello everyone I am just new here and would appreciate a little advice please, I have a 2003 ford focus 1.8tdci, I have bought a cotton air filter which requires that the old air box is removed however when i have taken the lid from the original factory airbox there is a small what looks like to be a vacuum pipe, the question is what do i now do with this pipe leave it free standing or plug it up ? any help would be greatly appreciated.

Trevor..

  • Quote


    Moved to Focus forum, where someone can hopefully help with this. :)

  • Quote

    If its the right filter them there should be a hole in the filter neck to add this its a crankcase breather pipe and is part of the emission system

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    The "Digestive"

    • The Digestive Forum Roundup (31st May - 7th June 2026)

      Steve ·
      The Digestive Forum Roundup (31st May - 7th June 2026) We hope you’re all enjoying your week and finding time for some time enjoying your Ford! This week, our vibrant forum has been buzzing with discussions that touch on a diverse range of Ford models, from the Mondeo to the Fiesta and Focus. Here’s a recap of some key conversations that might pique your interest. Starting with the Mondeo, user Frenchspanner shared a particularly frustrating issue relating to a 'Immobiliser Active' message appea
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