S-Coupe Turbo(UK) misfire help needed

Discussion in 'Hyundai Coupe / Tiburon' started by Awptech, Sep 3, 2004.

  1. Awptech

    Awptech Guest

    I have a 1995 model S-Coupe MVTI 1.5 and for ages it intermitently looses
    spark on the 2nd cylinder.
    HT leads have been replaced 3 times, plugs twice new coil fitted recently
    and the ECU reports no error codes...HELP
    It could drive a few days without problems then suddenly looses spark
    COMPLETELY on 2nd cylinder, where that particular lead connects to coil,
    at the coil end it is dead too, what else can this be
    Any answers are much appreciated.
    PS 60k miles on clock.
    Awptech, Sep 3, 2004
  2. Awptech

    hyundaitech Guest

    If I understand correctly, you have verified there is no spark coming out
    of the #2 coil tower. Do you know if the coil is being commanded to

    I heard of a case where the crankshaft sensor wheel was damaged causing a
    false TDC read and a lack of injector pulse or spark on #2 cyl. (Firing
    order is 1-3-4-2). I believe this car set a crank sensor code, however.

    But this case does remind me to ask whether you've checked to see if the
    #2 injector is firing?
    hyundaitech, Sep 3, 2004
  3. Awptech

    Awptech Guest

    Yes that is right the spark isnt present at the #2 coil tower. The coil
    must be being comanded to spark ok as the other 3 are ok. Not unless they
    are all independant of each other meaning the fault might not be anything
    todo with the HT line voltage at all?
    As far as i know injector 2 is just fine.
    What confuses me is the way the engine can run fine for quite a while then
    this happens for a few secs to mins at random intervals.
    Is the crankshaft sensor wheel easy to change?
    Another point to make, when idling the engine can idle a bit poor at times
    when warm but once throttle is added it runs at full power just fine, this
    is when the misfire is not present. A plug,lead change didnt help.
    Awptech, Sep 4, 2004
  4. Awptech

    Awptech Guest

    After double checking injector 2, it is working ok, just no spark from the
    coil tower for cylinder number 2.
    Can you recomend any parts/sensors that could be changed/checked to
    rectify this? coil/plugs and leads already done.
    Just to add, the car ran ok for 2 days then the spark dies off again for a
    few minutes today. the local hyundai dealer cant find anything or cant get
    the car to misfire while in shop!!!
    Awptech, Sep 6, 2004
  5. Awptech

    hyundaitech Guest

    I believe the 1995 Scoupe has two coils and no distributor. The coil for
    cylinders 2 and 3 could be having an intermittent problem.

    The sensor wheel doubles as the flywheel (manual) or flexplate
    (automatic). As such, you'll need to remove the transmission to replace
    hyundaitech, Sep 7, 2004
  6. Awptech

    Mad E Moe Guest

    Here is a simple thing you can try , the crank sensor is magnetic in
    nature and on a manual transmission equipped car will get covered with
    metal particles . Just remove the sensor from the transmission and
    wipe off the particles if present . This fix the problem I had on my
    95 Scoupe .
    Mad E Moe, Dec 11, 2004
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