205 missing, dropping cylinder
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  1. #1
    Fellow Frogger!
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    Default 205 missing, dropping cylinder

    G'day all,

    Well I got my car back with no oil leaking. Had the crank and cam seals replaced as well as the cam cover gasket. Very happy.

    But now the engine is missing or dropping a cylinder. It happens intermittently, but more so under load. I just gets rough and chugs along under powered.

    I took the plugs out and they were pretty black, and I only looked at them a couple weeks back and they were pretty good. I cleaned them up and put them back and she runs fine now.

    I'm thinking it might be the coil pack on the way out, delivering a weak spark and resulting in incomplete, or no combustion.

    The two cylinders furtherest from the distributor have the blackest plugs.

    What do you all think??

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  2. #2
    Contented Peugeot Driver addo's Avatar
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    I think the two plugs closest to the distributor, are the least black.

    How many coils does it have?

  3. #3
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    Yep, two plugs on the shortest leads, ie closest to the distributor (passenger side) were least black.

    It has one coil pack mounted above the intake plenum chamber.
    Last edited by Hicho; 3rd December 2012 at 08:58 PM.

  4. #4
    Contented Peugeot Driver addo's Avatar
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    If the coil were failing, all plugs should suffer similarly. I'd be going for a compression test - you may have bridged between three and four.

  5. #5
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    They were all black, but a couple a bit more so.

    When I took them out and cleaned them I changed over a couple (swapped them between cylinders) and the car then ran like normal, so I'm not sure if that would mean I had bridged between three and four. Hopefully not anyway!!

    Ill keep an eye on it and might replace the coil pack and now black plugs and hope for the best. I had been meaning to replace these for preventative maintenance reasons, but looks like the car may have beat me!

  6. #6
    1000+ Posts jo proffi's Avatar
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    With all this new found engine sealing, is your PCV now shitting itself and dumping oil into the cylinders???

    Jo

  7. #7
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    Quote Originally Posted by jo proffi View Post
    With all this new found engine sealing, is your PCV now shitting itself and dumping oil into the cylinders???

    Jo
    Interesting. I hadn't thought of that. I might check the valve and the lines and see if anything is amiss.

  8. #8
    1000+ Posts pug-life's Avatar
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    Hicho I would check:

    The dizzy to coil lead
    The coil
    Coil module connection
    spark plug gap
    O2 sensor (not quite the symtoms tho)

    Sounds like ignition i think though.

    If you run out of ideas take it to an autoelec that can use a oscilloscope...should be able to tell you whats wrong straight away

  9. #9
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    Quote Originally Posted by pug-life View Post
    Hicho I would check:

    The dizzy to coil lead
    The coil
    Coil module connection
    spark plug gap
    O2 sensor (not quite the symtoms tho)

    Sounds like ignition i think though.

    If you run out of ideas take it to an autoelec that can use a oscilloscope...should be able to tell you whats wrong straight away
    Thanks mate. My plan was pretty much that! I was happy to replace stuff anyway while trouble shooting. Was just hoping I wouldn't have to do it now - got the Rego check tomorrow, so don't want it coughing along!

    Will start with coil and plugs and then move onto leads and the dizzy. Will be sure to report back- or seek sympathy if its something worse!

  10. #10
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    Just to close this one off, I replaced the coil pack and plugs and haven't had the problem come back again.

    Thanks for the suggestions.

    ...and I passed the roadworthy on the second time around after replacing the front sway bar 'D' bushes and fixing some bad contacts on the left hand brake light and reverse switch on the gear box. Ripper!

  11. #11
    Fellow Frogger! DjB8V's Avatar
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    S3 isn't it? Plastic or metal manifold? Possible cracks?


    205GTI - 8 valve, single cam coolness.



  12. #12
    Fellow Frogger! rtsnoz's Avatar
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    Default 205 missing, dropping cylinder

    Pleased to hear you're on the road hicho. Hopefully see you around!

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