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  1. #1

    Join Date
    19 Apr 2014
    Location
    MINNESOTA
    Posts
    2
    Saab(s)
    2007 93 aero
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    9-3 aero shudder issue

    So, My 07 Aero started doing the shuddering while driving highway speeds issue a few months ago and threw a #3 cylinder misfire code like many others here. So as described I replaced the #3 coil pack and it hasn't cured the problem. I still get the same code for the same cylinder. My question is, should I just start replacing all of them and hopefully the problem goes away, or could it be something else?

    Thank You in advance.

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  2. #2
    Saab Nut 9-3 Aero's Avatar
    Join Date
    22 Apr 2013
    Location
    Tromsų, 69° 41' N
    Posts
    464
    Saab(s)
    2009 9-3 2.0T SC Aero XWD\eLSD. eSID2
    Thumbs Up:   4
    It could be the #3 cylinder spark plug; sooty, incorrect spark gap or even malfunctioning. As the plugs are serving as knock detectors as well, are the Saabs sensitive to correct type spark plugs.

    I assume this is the 4-cylinder engine?

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  3. #3

    Join Date
    19 Apr 2014
    Location
    MINNESOTA
    Posts
    2
    Saab(s)
    2007 93 aero
    Thumbs Up:   0
    Nope, it's Turbo 6, and I replaced all plugs with new and gapped all to the correct spec. I replaced the Coil Pack with a Delco unit purchased from Autozone and it still shuddered right after I did the work. Not as bad but still the issue never quit.

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  4. #4
    Saab Nut 9-3 Aero's Avatar
    Join Date
    22 Apr 2013
    Location
    Tromsų, 69° 41' N
    Posts
    464
    Saab(s)
    2009 9-3 2.0T SC Aero XWD\eLSD. eSID2
    Thumbs Up:   4
    Sorry for the assumption with regard to engine; 4DI T is the more common one on this side of the pond.

    Then, as the plugs are correct type and electrode gaps in accordance with specification, one step in troubleshooting could be swapping the #3 coil pack with another cylinder, just to note whether the fault code, which I assume is/was P0303 xx, stays with the #3 cylinder - or not. If it does, compression of course could be a part of the misfiring game.

    What was the OE(M) pertaining to the coil pack?

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