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  1. bombitmd's Avatar
    bombitmd
    bombitmd is offline Verified Tsikot Member
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    April 30th, 2011 12:37 PM #1
    What can happen if I install a spark plug with 1.1 spark gap when my car's manual recommends a 0.8 spark gap? My second hand Vios 1.5G had 1.1 spark plugs installed (last tune up when bought was Shell service station) so when I had it tuned up recently, they also installed 1.1

    I've been driving it for a year and it runs smoothly naman, except that it feels a bit underpowered at times. I'm also concerned about long term effects of a wrong sized spark gap, if any.

    TIA!
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  2. arch_auto
    arch_auto is offline Verified Tsikot Member
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    April 30th, 2011 02:52 PM #2
    Quote Originally Posted by bombitmd View Post
    What can happen if I install a spark plug with 1.1 spark gap when my car's manual recommends a 0.8 spark gap? My second hand Vios 1.5G had 1.1 spark plugs installed (last tune up when bought was Shell service station) so when I had it tuned up recently, they also installed 1.1

    I've been driving it for a year and it runs smoothly naman, except that it feels a bit underpowered at times. I'm also concerned about long term effects of a wrong sized spark gap, if any.

    TIA!
    Vios 1.5G with 1NZ-FE engine? The spark plug's gap specs is really 1.1 mm.(both Denso and NGK), and not .08mm.
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  3. bombitmd's Avatar
    bombitmd
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    April 30th, 2011 04:56 PM #3
    Quote Originally Posted by arch_auto View Post
    Vios 1.5G with 1NZ-FE engine? The spark plug's gap specs is really 1.1 mm.(both Denso and NGK), and not .08mm.
    Arch, where'd you find that info? The car's manual states 1NZ-FE engine's is 0.8 mm spark gap (p.161) Well, either way, would you know if what would happen if we used a different gap size for the engine?
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  4. arch_auto
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    April 30th, 2011 09:10 PM #4
    Quote Originally Posted by bombitmd View Post
    Arch, where'd you find that info? The car's manual states 1NZ-FE engine's is 0.8 mm spark gap (p.161) Well, either way, would you know if what would happen if we used a different gap size for the engine?

    Different spark plug gap size from the manufacturer's specs will cause premature wear of the electrodes, causes misfires, early fouling.

    I got the info from the Service Manual (not Owners Manual) of 2007 Yaris with 1NZ-FE engine (same like yours). Also if your plug is NGK BKR5EYA-11, the last numbers corresponds to the gap of the plug.

    0.8 mm spark plug is also used by Toyota for the 1NZ-FE. Follow this link for the explanation. http://myviosjournal.blogspot.com/20...ark-plugs.html
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    bombitmd
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    May 1st, 2011 11:32 AM #5
    Ok, thanks a lot! Read the article, too, thanks! At least I don't have to change spark plugs :P
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    May 25th, 2011 02:56 PM #6
    large gap means smoother idle but may misfire in higher rpm.
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