why does the rpm goes up and down when engine starts?

Discussion in 'Mk3' started by isak, Mar 21, 2020.

  1. isak New Member

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    why does the rpm goes up and down when engine starts but it normalizes after it gets its temperature?
    i need answers please!
     
  2. clarky1961

    clarky1961 Paid Member Paid Member

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    Jan 30, 2008
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    Location:
    i live in north east england gateshead
  3. Tristan

    Tristan Paid Member Paid Member

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    Coolant temp sensor?
     
  4. GregVR6GTI New Member

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    Idle Switch ?

    have you find your prolem ?
     
  5. ashyboy1995 New Member

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    I don't have a MK3 but it might be the idle value/switch as said above

    I have an 87 GTI 8v which I know isn't a MK2 but mine does for a few seconds before settling, I've also experienced starting issues and poor running when hot which I suspect is the idle value
     

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