Xantia v6 rough running
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  1. #1
    Fellow Frogger!
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    Default Xantia v6 rough running

    The V6 has decided to run rough in that it is not firing on all cylinders when hot
    Starts and runs smoothly when cold but upon warming up it drops a few cylinders
    If I rev it harder under load it improves but not perfectly
    So my question is what diagnostic tools are available to further solve the problem
    Thanks

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  2. #2
    1000+ Posts cav91's Avatar
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    Most likely to be coils. But best to check it out.
    406 D8 V6 manual

  3. #3
    Contented Peugeot Driver addo's Avatar
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    Lexia will show you the coil dwell times and advance. That's usually a dead giveaway for a duff coil.

    I point people at Fleabay (UK sellers can usually get something here in a week) or Aliexpress for coils if they have time, or EAI if they need it ASAP.

    How's the autobox? 150-160K is usually when they spit the dummy and need an overhaul.

  4. #4
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    Fine 340K

  5. #5
    Contented Peugeot Driver addo's Avatar
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    Seriously amazing mileage. Perhaps it had a good rebuild in the past.

    http://www.eastment.net/4hp20/4hp20_introduction.htm

    for some interesting gearbox porn

  6. #6
    Budding Architect ???? pugrambo's Avatar
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    Quote Originally Posted by Sherman View Post
    The V6 has decided to run rough in that it is not firing on all cylinders when hot
    Starts and runs smoothly when cold but upon warming up it drops a few cylinders
    If I rev it harder under load it improves but not perfectly
    So my question is what diagnostic tools are available to further solve the problem
    Thanks
    can you hear a tapping noise when it's missing ?
    3 x '78 604 SL

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  7. #7
    Fellow Frogger!
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    No tapping noise
    Just a "missing burble" in the exhaust
    It probably is the coil pack
    I will get one of those Lexias and then we wont have to guess
    Thanks everyone much appreciated

  8. #8
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    Be sure to replace with Delphi coils only for reliability.

  9. #9
    Fellow Frogger!
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    The coils are in one potted unit looks like 3 coils for the six pots
    Anyway turned out to be a fine mist from a little leak from a heater hose spraying on the plug leads
    Hence the temperature component

  10. #10
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    Ah! The old fine water spray on the electrics trick eh! Happened to me in 1986, while driving a 504 down the Newell Highway (with family in the car, and towing a heavy trailer ). The water would cause a (temporary) complete loss of spark, followed by the sudden return of spark, as presumably the water evaporated.

    The resulting explosions of unburnt fuel in the muffler were impressive - they probably still tallk about it in Coonabarrabran! Pretty well destroyed the muffler by the time we got home and resolved the problem .

    Cheers

    Alec

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