Dodgy Idling and Lumpy sometimes?

  1. Saxperience Forum Bum Joined: Apr 2007 Trowbridge, Wiltshire Posts: 3769 A van...
    #1
    As above...

    1999 GTi with 122k.
    Occasionally on idle it just starts running really lumpy, after 10 seconds sorts itself.

    Also, on half throttle etc when driving it also goes lumpy / bogs - When i full throttle or lift off and go again it clears..

    No EML, no Fault codes, nothing.
    Full service about 2 weeks ago
    Ran a Redex through

    Still no ideas...

    Any suggestions?

    Cheers
  2. Saxperience Post Whore Joined: Jan 2008 ..... Posts: 5231 ..............
    #2
    lambda?
  3. Saxperience Forum Bum Joined: Apr 2007 Trowbridge, Wiltshire Posts: 3769 A van...
    #3
    No fault codes?

    Only very intermittent too :/
  4. Infrequent Poster Joined: Sep 2007 East Sussex Posts: 137 VTS - Sold New: E46 M3
    #4
    Unfortunately this is quite a common problem for the vts/gti engines.
    There are a few things to try:
    • Ensure spark plugs were gapped correctly
    • Clean throttle body and idle control valve (ICV)
    • First cheaper thing you can try is to replace the coolant temperature sensor (around £10-15)
    • If cleaning the ICV doesn’t work, use a friends’ ICV from a vts/gti that idles correctly/nicely and try it in your car. (If this does the job purchase a new one from Citroen or euro car parts – ones off of ebay on the whole seem to be no good)
    • If still no luck, try in a friends coil pack from a vts/gti again that runs correctly to see if this remedy’s the problem. If so purchase a new one.

    Doing all of the above will get you to the root of your problem –eventually!
    Hope this helps,
    Jimbo
    1 user thanked this post:
  5. Saxperience Forum Bum Joined: Apr 2007 Trowbridge, Wiltshire Posts: 3769 A van...
    #5
    Thanks for your help bud,

    Done some of those, and it seems a touch better, still isn't right though - The idle control valve when unplugged makes no difference at all, which is a little odd?

    I've a mate with a VTS off the road so i'm slowly using his parts to diagnose

    Cheers
  6. Saxperience Forum Bum Joined: Mar 2008 Driving my GTI Posts: 2659 Boosted 106 GTI 16V Supercharged
    #6
    You sure this hasent been cammed and running like it is due to needeing a map.
  7. Saxperience Forum Bum Joined: Apr 2007 Trowbridge, Wiltshire Posts: 3769 A van...
    #7
    It only idles like it for about 10 seconds and sorts itself, it also seems pretty good on fuel so doubtful surely?
  8. Established Member Joined: Apr 2008 west Mids Posts: 1775 Mk1 White VTS
    #8
    exact same problem mate. Only things left for me to change is MAP sensor, TPS sensor, Coilpack and ECU.

    Have done any of those yet?
  9. Saxperience Forum Bum Joined: Apr 2007 Trowbridge, Wiltshire Posts: 3769 A van...
    #9
    I haven't changed anything yet, was hoping to find someone with the same problem...

    Unplugging my ICV does nothing when the car is running making me think that, there's no fault code, not even intermittent.

    Cheers
  10. Established Member Joined: Apr 2008 west Mids Posts: 1775 Mk1 White VTS
    #10
    No fault code on mine either. Get any further with this?
  11. Regular Poster Joined: Jun 2011 Wakefield Posts: 395 saxo vtr/vts 106 diesel
    #11
    Un plug lamba then take it for a run mine was exact same problem and doing this cured it.
  12. L-plater Joined: Sep 2011 Ash/ Surrey Posts: 91 Saxo vtr Saxo vtr with 106 gti cammed
    #12
    I had the same problems and thanks to this thread I found the problem. Mine was the lambda
  13. Established Member Joined: Apr 2008 west Mids Posts: 1775 Mk1 White VTS
    #13
    Quote:
    Originally Posted by saxovtrmk1 View Post
    Un plug lamba then take it for a run mine was exact same problem and doing this cured it.
    But without the lambda wouldn't it run like crap? Did you have a de-cat when you tried this?
  14. Established Member Joined: Sep 2007 Armadale, West Lothian Posts: 1230 flatty 16v sleeper and a regular vts
    #14
    Quote:
    Originally Posted by Psycho18 View Post
    But without the lambda wouldn't it run like crap? Did you have a de-cat when you tried this?
    i have no lambda and mine runs perfect
  15. Established Member Joined: Apr 2008 west Mids Posts: 1775 Mk1 White VTS
    #15
    Quote:
    Originally Posted by kennym1987 View Post
    i have no lambda and mine runs perfect
    In that case it's worth a try.
  16. Saxperience Post Whore Joined: Nov 2010 Kent Posts: 8439 Gen 7 Celica 190.
    #16
    Quote:
    Originally Posted by kennym1987 View Post
    i have no lambda and mine runs perfect
    Mine dont it kept bogging down and juddering plugged it back it and it was fine, just dont ever want to idle.
  17. Established Member Joined: Dec 2006 Fleetwood Posts: 2244 2002 Saxo VTS
    #17
    Injectors are notoriously problematic. Injector cleaner is shite. Buy a cheap second hand set of injectors, send them to be refurbed for about a tenner each. It'll be like a new car.
  18. L-plater Joined: Sep 2011 Ash/ Surrey Posts: 91 Saxo vtr Saxo vtr with 106 gti cammed
    #18
    I unplugged my lambda sensor and that was the problem but haven't come round to replacing it, just a though would a vtr/vts lambda do the same job as the gti lambda? Because I have a space vtr lambda sat on my unused vtr engine
    Thanks for the help guys
  19. Established Member Joined: Sep 2007 Armadale, West Lothian Posts: 1230 flatty 16v sleeper and a regular vts
    #19
    thats what i was thinking. maybe the vtr lambda would be the same? just to grab one from the scrappy and see as there are no 16vs in my area
  20. L-plater Joined: Sep 2011 Ash/ Surrey Posts: 91 Saxo vtr Saxo vtr with 106 gti cammed
    #20
    I have a gti conversion in my vtr and I have the vtr engine in my shed. I was just wondering if the vtr lambda will be the same as the gti
  21. Established Member Joined: Sep 2007 Armadale, West Lothian Posts: 1230 flatty 16v sleeper and a regular vts
    #21
    try it and see. then let me know haha