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Thread: idle control valve or plugs?

  1. #1
    Guest ryry92's Avatar
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    idle control valve or plugs?

    Hi guys, I have an intermittent fault at the mo.. sometimes on idle my car seems to starting misfiring and gets progressively worse until it almost stalls.. If I leave it for a minute or so it picks up the revs again.

    I also wondered if this is linked to something I have noticed for a while but thought I was just being silly; in first ( most distinctively anyway ) when I pull away with my foot hard down I get a very slow pull off.. then at around 20mph a massive kick as if the turbo was offline or the maf sensor is playing up?

    I didn't know if it coupd be idle control valve because I didn't think that would have anything to do with throttle response when in gear/motion???

    Maybe plugs?

    Any suggestions appreciated. . Having a full service this week and clutch change so hoping to fix the problem then

    Thanks in advance

    Ry

  2. #2
    Engine Builder Mark's Avatar
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    Check the wastegate as they can stick open a bit causing lag.

    Is it missing or hunting at idle? if its hunting then its probably the idle speed valve.
    Quote Originally Posted by silverzx View Post
    I like Mark, he seems fair.
    Quote Originally Posted by Slip_n_slide View Post
    Mark is right.

  3. #3
    Guest Amoeba's Avatar
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    Could well be plugs, how old are they? Mine was misfiring like a twat when it had crappy old plugs in

    Get some quality new copper ones and set the gap right and report back.

  4. #4
    Guest ryry92's Avatar
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    The Turbo was refurbished and only fitted in January..do you think it could stick that early? Bloody hope not lol, I have a new fuel filter and set of iridium ngk plugs for the service kit so I'll be fitting them too just worried it could be maf sensor or something serious? I also have a spare maf sensor adapter that bolts onto the induction cone so I might try the other one out n see if it changes..

    I'm not really sure what hunting is Mark.. lol it's not fluctuating erratically but it seems to burble really low and the whole car vibrates... if I rev it the vibration goes then comes back... doesn't always happen it's almost 50/50

    Would a video help?

  5. #5
    Engine Builder Mark's Avatar
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    Hunting is the revs dropping and rising, ifs its missing the revs will stay fairly even but the engine will shake and it will sound lumpy.
    Quote Originally Posted by silverzx View Post
    I like Mark, he seems fair.
    Quote Originally Posted by Slip_n_slide View Post
    Mark is right.

  6. #6
    Guest Si's Avatar
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    It's been a long time since I've ventured into S14 tech, and I'm slightly concerned to see the lack of obvious being suggested here.
    Boooost leak...

  7. #7
    Guest ryry92's Avatar
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    - edit
    Last edited by ryry92; 09-07-2014 at 17:46.

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    Guest ryry92's Avatar
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    I don't have any surge or indication from the boost gauge.. or would that not be where it comes from?

  9. #9
    Guest ryry92's Avatar
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    Will post video over the weeknd
    Last edited by ryry92; 10-07-2014 at 16:02.

  10. #10
    Guest ryry92's Avatar
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    http://youtu.be/HL1LGYg4bvo bump for the weeknd any help appreciated guys

  11. #11
    Guest ryry92's Avatar
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    The boost solenoid/ actuator on the right hand side of the bay... its ticking.. could this be the problem guys?

  12. #12
    Guest ryry92's Avatar
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    Bump

  13. #13
    Guest ryry92's Avatar
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    Bumppp

  14. #14
    Engine Builder Mark's Avatar
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    Did you change the plugs?
    Quote Originally Posted by silverzx View Post
    I like Mark, he seems fair.
    Quote Originally Posted by Slip_n_slide View Post
    Mark is right.

  15. #15
    Guest ryry92's Avatar
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    Yep

  16. #16
    Guest ryry92's Avatar
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    Ttt

  17. #17
    Guest ryry92's Avatar
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    Bump

    Anyone?

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    Try disconnecting your lambda and see how it behaves. I had similar symptoms and after replacing plugs, fuel filter, coil packs etc. it turned out to be a faulty lambda.

  20. #20
    Guest ryry92's Avatar
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    Quote Originally Posted by Si View Post
    Do the same rules apply for FMIC over WM Si? Thanks for the link

    Quote Originally Posted by Ralz View Post
    Try disconnecting your lambda and see how it behaves. I had similar symptoms and after replacing plugs, fuel filter, coil packs etc. it turned out to be a faulty lambda.
    Ok chap I'll have a look.. changing clutch tomorrow so will do it then. In the mean time this is the last and latest video I caught of the car mis behaving

    Idles fine till I rev it hard http://youtu.be/6Dsy8i0FV1M

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