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    Markers's Avatar
    Markers Posts: 1, Reputation: 1
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    #1

    Sep 17, 2007, 07:22 PM
    99 Civic with wrong spark plugs?
    My Civic LX engine D16Y7 has 65K miles so it is time to replace the spark plugs.
    I looked up in the owner's manual and the NGK replacement part is ZFR5F-11. I bought the iridium ones ZFR5FIX-11.
    When I removed the old ones, to my surprise they were ZFR6F-11.
    Note that this car has only been serviced at a Honda dealer, and as far as I know the spark plugs have never been replaced.
    I installed the spark plugs anyway and the car has low rpm at idle.
    I disconnected the battery to reset the computer with no result.
    I have not found any recommendation to use ZFR6F-11 instead of ZFR5F-11, so does anybody know why Honda would install at the factory one type and recommend another as replacement in the manual?
    Thank you
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Sep 17, 2007, 07:52 PM
    Yes, the ZFR6F-11 are for use in warmer climates; i.e. they are a colder-running plug. Since I live in Texas, I use colder-running NGK plugs in my Civic. If you look in your owner's manual, and/or on the sticker under the hood, you'll likely see what Honda did is fine.
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