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Odd motor noise at startup?

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1 reply to this topic

#1 OFFLINE   JeanClaudeVanDammit


    New Member

  • C-MAX Energi Member
  • Pip
  • 5 posts
  • Region:Decline
  • LocationNortheast
  • My C-MAX:2016
  • Current Vehicle:2016 ENERGI SEL

Posted 13 April 2019 - 08:45 AM

I think this might be a normal thing, but I was curious why it does this.

When I start the car, or sometimes when it goes into idle mode, it’ll make a noise that sounds like someone left a cellphone on vibrate in the engine compartment for a few seconds before stopping.

What is it doing? I have wondered since I got it.

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#2 OFFLINE   cr08


    New Member

  • C-MAX Energi Member
  • Pip
  • 259 posts
  • Region:U.S. Great Lakes
  • LocationColumbus, Ohio
  • My C-MAX:2013
  • Current Vehicle:2013 Ice Storm C-Max Energi

Posted 13 April 2019 - 10:34 AM

That's the vacuump pump for the brakes. It runs intermittently as needed to maintain a vacuum in the system and in most cases will do so right at startup.

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