Replacing my spark plugs Thursday
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Thread: Replacing my spark plugs Thursday

  1. #1
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    CruzeEcoBlueTopaz's Avatar
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    Replacing my spark plugs Thursday

    Im planning on replacing my spark plugs in my 2012 Cruze Eco with 75k miles and I need to know why ACDelco lists 2 spark plugs for my vehicle and what the difference is. Also the Cruze manual says my spark plug should be the 41-117. What did GM offically announce about the gap ? these list .28 I will upload a picture thursday of what my spark plugs look like after 75k miles and averaging 50mpg actual for anyone who is curious. Thanks for the info.


    SPARK PLUG ASM
    Part Number: 41-120
    Product Notes:
    Iridium Spark Plug
    ECO

    Per Vehicle: 4; Years: 2012-2012

    SPARK PLUG ASM
    Part Number: 41-121
    Product Notes:
    Iridium Spark Plug
    .028 GAP ; ECO

    Per Vehicle: 4; Years: 2012-2012

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  3. #2
    3rd Gear kfr291's Avatar
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    can you do a write up on a how-to?

  4. #3
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    XtremeRevolution's Avatar
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    Quote Originally Posted by kfr291 View Post
    can you do a write up on a how-to?
    There is a write-up for checking and adjusting the spark plug gaps, which is basically the same thing.

    To the OP: I believe the spark plugs are simply updated revisions of an older plug. You may find that one or the other may be discontinued or low in stock. I don't think either will cause any issues.
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  5. #4
    Learning about my Cruze
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    THe 41-121 is only for motors produced at the flint plant according to the gm parts catalog.

  6. #5
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    I'd use whichever one is in stock. Not sure what the difference, if any, would be.
    2012 Chevrolet Cruze Eco
    2009 Honda Fit Sport

    Learn from the mistakes of others, so when you err it can be in new and interesting ways.

  7. #6
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    obermd's Avatar
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    GM finallly settled on 0.025-0.0275.

    2012 ECO MT - Black Granite/Cloth; 814 mile range; Bluetooth Stereo AUX; OEM Fogs w/Chrome Covers; GM Spare tire; VG Shark Fin
    2010 Mit Lancer GT MT (traded for ECO @31K miles)
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    CruzeEcoBlueTopaz's Avatar
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    Thanks for the info gentlemen.

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    6th Gear AutumnCruzeRS's Avatar
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    So is the 41-117 plug correct in the manual. I want to get new plugs before I go pulling out the originals just incase theres any issues.

  10. #9
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    heres a quick problem solver for us cruze owners and want to change plugs or anything. Buy a KN air filter, it may cost 50 or sixty bucks but it WILL SAVE you in gas. Trust me on that. NGK which is the plugs that gm originally put in the cruzes in production are the best plugs on the market. Id go with the Iridiums from ngk. Sure they are a little pricey, actually the same cost as the delco's but the iridiums were highly designed for increased mpg, lower emissions, and better fuel burn, which means they burn less fuel to help you go farther. if anyone has a question about a part, im ur man to ask. Im a mechanic who knows his stuff lol. I say that in confidence. Thanks

  11. #10
    6th Gear AutumnCruzeRS's Avatar
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    Can you tell me if acdelco 41-117 plug is correct for the 1.4T

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