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  1. #1
    Saab Fan chouston's Avatar
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    01 Feb 2014
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    900 coupe 1997
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    Spark gap 1.1 or 0.7 ???

    Hi everyone,

    I just put new NGK plugs into a 2.0 litre normally aspirated engine without a D.I.C (1997 900i)
    I gapped them at 1.1 as per reference material.

    Then I read the emmissions control sticker placed on the car for Australia and it says spark gap 0.6-0.7 ??????????????

    It also says standard fuel (91ron) when I thought saabs (even non turbo) preferred premium. ???????????

    Should I take my plugs out and regap from 1.1 to 0.6 ????

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  2. #2
    Saab Fan
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    14 Mar 2011
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    The WIS calls for NGK BCP5EV plugs gapped at 0.6mm.

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  3. #3
    Saab Fan chouston's Avatar
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    01 Feb 2014
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    Saab(s)
    900 coupe 1997
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    Do you reckon I can save $20 by regapping the BCPR7ES down to 0.6 or will the heat range and resistor not be welcomed by my engine?

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  4. #4
    Saab Fan
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    If it was me, I would switch to the proper plugs, but that is because I don't know the implications of using the other ones and I'd rather be on the safe side ($20 amortized over the long lifespan of spark plugs being preferable to unknown issues). Resistor vs. non-resistor is usually a pretty big difference though.

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  5. #5
    Saab Fan chouston's Avatar
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    01 Feb 2014
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    Saab(s)
    900 coupe 1997
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    Thanks again,

    Still confused as I just ordered the BCP5ES, from the guy who sold me the 7R and he showed me the online catalogue that had either plug listed, and both come gapped at 1.1

    Out of the box the BCP5ES has a gap of 1.1

    Yet my emissions sticker and the WIS states 0.6???

    Other threads on this website suggest 1.1 ????

    and I am confused why NGK would have an R plug listed for a car that has resistor HT leads?

    The elctrodes on the 5 that I took out all had melted electrodes with makes me think they are rated too low (run hot) so I should run the alternative 7 ???

    Any plug experts ???

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    Last edited by chouston; 02 March 2014 at 05:05.

  6. #6
    Saab Fan
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    14 Mar 2011
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    The turbo versions of the 2.0 liter engine use BCPR7ES gapped to 1.0-1.1mm, so maybe the parts counter guy got them mixed up? Not sure about your heat range question though.

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