Misfire when revved

Thread in 'Technical Questions' started by chicane1992, Nov 29, 2014.

  1. chicane1992

    chicane1992 Member

    Joined:
    May 2, 2014
    Posts:
    72
    Likes Received:
    0
    Location:
    Bournemouth
    My mates s14 has just started misfiring. It only does it when it's revved but never at idle. We have changed spark plugs and tested coilpacks but it's still there. Anybody have any ideas? Needs it sorted ASAP as he's supposed to be going to dwyb with me in a few weeks. Thanks
     
  2. NikH

    NikH Member

    Joined:
    Nov 6, 2012
    Posts:
    714
    Likes Received:
    0
    Location:
    London/Essex
    what mods are on it? checked all boost pipes?
     
  3. chicane1992

    chicane1992 Member

    Joined:
    May 2, 2014
    Posts:
    72
    Likes Received:
    0
    Location:
    Bournemouth
    We've had a once over but it does it when it's not under load aswell so assumed boost wouldn't be the problem
     
  4. NikH

    NikH Member

    Joined:
    Nov 6, 2012
    Posts:
    714
    Likes Received:
    0
    Location:
    London/Essex
    could still be a boost leak would make it idle a little rough or cause a misfire. Get some easy start and spray the joints... if the engine pitch changes you have a leak
     
  5. chicane1992

    chicane1992 Member

    Joined:
    May 2, 2014
    Posts:
    72
    Likes Received:
    0
    Location:
    Bournemouth
    OK bud, I'll have a gander tomorrow. Thanks!
     
  6. FAbity6032

    FAbity6032 Member

    Joined:
    Oct 3, 2013
    Posts:
    297
    Likes Received:
    2
    I was watching a tv show today and they told me it could be the fuel injectors. Because as the fuel injectors age the spray pattern gets worse and it could cause a misfire.
     
  7. Tommoore99

    Tommoore99 Member

    Joined:
    May 5, 2014
    Posts:
    63
    Likes Received:
    0
    Location:
    Southampton
    Mine used to do this spent ages checking things like boost leaks, injectors, plugs, leads then it turned out to be a dodgy maf.
     
  8. chicane1992

    chicane1992 Member

    Joined:
    May 2, 2014
    Posts:
    72
    Likes Received:
    0
    Location:
    Bournemouth
    Cheers mate we will look into that today
     
  9. thenextdk

    thenextdk Member

    Joined:
    Sep 11, 2010
    Posts:
    642
    Likes Received:
    0
    Location:
    Herefordshire
    I was gunna suggest air flow meter too. Mines giving me a headache at the moment where it keeps getting covered in oil and making the car hesitate. Don't ask me how, or indeed how I'm gunna stop it happening.........grrrrr
     

Share This Page