Mystery Ignition Component - 406 D8 V6 - Help me identify please...
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  1. #1
    Tadpole Gruffnutz's Avatar
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    Default Mystery Ignition Component - 406 D8 V6 - Help me identify please...

    My 406 Coupe started to run rough between 2000 and 3000 rpm, but only when the engine was at full operating temp. Then it started to run rough all the time. Investigation of the ignition system revealed the component circled in red in the pictures below to be pretty much destroyed...





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    I thought it was just an earth point but it looks more like a resistive load or sensor. Maybe manifold temperature, which would make sense...

    Mine is totally obliterated and from the pile of high temp plastic shards it seems to have been on the way out for some time. If I touch what remains to the bolt with the ignition on there is a distinct click from the ECU box area, like a relay switching, indicating that it does something active rather than being a passive earth point.

    What is it and where can I get one???

    Thanks in advance! ;-)

  2. #2
    Demannu-facturing! Demannu's Avatar
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    It's just a noise-suppressing capacitor. It will run fine without it, but you might hear more noise on your stereo in low-signal areas.

    The cracks in your coil pack are infinitely more likely to be the cause of your symptoms.
    Scotty

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  3. #3
    Tadpole Gruffnutz's Avatar
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    Thanks very much!!! I guessed the coil pack was FUBARed as well but wanted to follow a process of elimination. New coil pack and plugs it is then.

    Again, thanks for your prompt help. I guess I can look for some markings and ring up a replacement suppressor cap. Still curious as to why earthing it would cause the 'relay like clicking' from the ECU region if anyone knows...

    P.S. That isn't my coil pack in the photos; mine is much worse.

  4. #4
    Fellow Frogger!
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    I have several coil packs if you want to pick up one from a rural property near Balan
    FTGH
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    Colin

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  5. #5
    Fellow Frogger!
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    I have one in Melton as well

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  6. #6
    Tadpole Gruffnutz's Avatar
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    Time poor so I bought a coil pack online but thanks for the helpful offers. Now running great when cold and starting easily but still misfiring when she's at operating temp. Any ideas?

  7. #7
    Demannu-facturing! Demannu's Avatar
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    Quote Originally Posted by Gruffnutz View Post
    Time poor so I bought a coil pack online but thanks for the helpful offers. Now running great when cold and starting easily but still misfiring when she's at operating temp. Any ideas?
    Did you replace the plugs at the same time?
    Scotty

    Melbourne - Dandenong Ranges

    1956 Peugeot 403 - 'Francois' - resto project

    1969 Peugeot 504 - 'Pascal' - daily driver project

    1970 Peugeot 404 Utility - 'Brutus' - resto project

    1978 Peugeot 604 - as yet unnamed - V6 on straight LPG

    1987 Peugeot 505 - as yet unnamed - project car

    1999 Peugeot 406 Coupé - 'Chloe' - 5 speed manual

    2011 Peugeot 3008 XTE HDi - 'Zoe' - hatchback on steroids

    2014 Peugeot RCZ - 'Remy'

    1999 Range Rover 4.6 HSE - 'Grover' - tow car

  8. #8
    Tadpole Gruffnutz's Avatar
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    Yes, plugs changed. As stated, runs great cold, misfires @ normal operationg temp. Checking other sensors but totally confused. Cheers lads.

  9. #9
    Tadpole Gruffnutz's Avatar
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    Any other ideas? Still struggling with this...

    I've tried replacing the temperature sensor as well. No joy!

  10. #10
    COL
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    It sounds like a one of the six coils is not firing.

    Have you put a OBD2 scanner on and seen what the codes are. This will give you a hint of where to look, takes a lot of the guess work out.
    Regards Col

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  11. #11
    Demannu-facturing! Demannu's Avatar
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    Was the replacement coil pack new or used? Still sounds like it is the problem.
    Scotty

    Melbourne - Dandenong Ranges

    1956 Peugeot 403 - 'Francois' - resto project

    1969 Peugeot 504 - 'Pascal' - daily driver project

    1970 Peugeot 404 Utility - 'Brutus' - resto project

    1978 Peugeot 604 - as yet unnamed - V6 on straight LPG

    1987 Peugeot 505 - as yet unnamed - project car

    1999 Peugeot 406 Coupé - 'Chloe' - 5 speed manual

    2011 Peugeot 3008 XTE HDi - 'Zoe' - hatchback on steroids

    2014 Peugeot RCZ - 'Remy'

    1999 Range Rover 4.6 HSE - 'Grover' - tow car

  12. #12
    Tadpole Gruffnutz's Avatar
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    Quote Originally Posted by COL View Post
    It sounds like a one of the six coils is not firing.

    Have you put a OBD2 scanner on and seen what the codes are. This will give you a hint of where to look, takes a lot of the guess work out.
    It's a 1998 D8, so no OBD2 as far as I'm aware.

    The coil pack was brand new. I didn't replace the leads / distribution block for the rear cylinders because it looked OK. Could that be an issue?

  13. #13
    COL
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    Quote Originally Posted by Gruffnutz View Post
    It's a 1998 D8, so no OBD2 as far as I'm aware.

    The coil pack was brand new. I didn't replace the leads / distribution block for the rear cylinders because it looked OK. Could that be an issue?
    Not being a Peugeot person was not sure of the year, was just trying to offer a suggestion to help fix. Maybe you will need to get hold of what ever diagnostic system that Peugeot used for that era.

    You could try disconnecting each cylinder individually to see which cylinder is not firing properly, it will also tell you if it is the front or rear bank of cylinders.
    Regards Col

    1973 Renault R12 Station Wagon
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  14. #14
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    Maybe the wiring in that wrapping has a fault which might be affecting one of the injectors when hot? If disconnecting plugs reveals nothing maybe disconnect injectors one by one. You can take the metal clips out for the purpose so the plugs go on and off easily.

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