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Check your spark plugs

This is a discussion on Check your spark plugs within the Kia Forte Turbo Maintenance forums, part of the Kia Forte Turbo Garage category; I had a ignition coil go bad on cylinder 4. Pretty shitty considering I only have 51K. I checked the plugs during trouble shooting and ...

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    Member atlsud's Avatar
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    Check your spark plugs

    I had a ignition coil go bad on cylinder 4. Pretty shitty considering I only have 51K.

    I checked the plugs during trouble shooting and the gaps were way out of spec ranging from .045 to .055. I'll post pic later tonight. I suggest check the gaps on your plugs on your next OC.

    The plugs were the Autolight xr5703 that I switched out when I first got the car 09/2015 so less than 50K on the plugs.
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    Last edited by atlsud; 05-10-2019 at 05:58 AM.
    2015 Forte5 SX

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    PLP
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    Aren't plugs scheduled at 45k miles to be replaced on T-GDI?

    I might be old school, but I do not trust spark plugs that have more than 30k miles... especially in this engine.
    Drives:
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    2014 FIAT 500e (my first EV - awesome toy!!)
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    Member atlsud's Avatar
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    Quote Originally Posted by PLP View Post
    Aren't plugs scheduled at 45k miles to be replaced on T-GDI?

    I might be old school, but I do not trust spark plugs that have more than 30k miles... especially in this engine.

    I wasn't aware of the change intervals for the plugs. I pulled the OEM plugs and replaced with the Autolites the first couple of months I got the car. I'll check every other OC as these Autolites are pretty cheap with discounts at Advance Auto.
    2015 Forte5 SX

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    Senior Member SXTurbo's Avatar
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    Put a set of NGK 1422's in about 500 miles ago. Set the gap on them to .028 as they were about .024 out of the box. I wanted to get some miles on these plugs before talking about them here. So far the biggest difference I notice is much less what I call "Fish Bite" when accelerating through gears.
    2016 SX Silver
    Build Date 4/16
    In Service 2/13/17

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    What plug # did you take out? I haven't checked my plugs yet.
    What do you mean by "fish bite"?
    2014 Koup "SX" A/T Silver. Mods; Tint, 6th EE Delete Pipe, Sylvania SilverStar Head, Nokya Fog, Interior LEDs, Debadge (Forte) Trunk-75A Red Dogbone (one side only) Done.

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    Senior Member SXTurbo's Avatar
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    OE plugs were SILZKR7E8EG. Fish bite I'll describe as a hesitation or feels like a misfire when accelerating.
    2016 SX Silver
    Build Date 4/16
    In Service 2/13/17

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    PLP
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    I experienced the misfire like and hesitation.
    However, what I later noticed that if I drove the car hard for a while - a few WOT pulls, higher rpm at WOT, spark plugs would "clear" and all would seem good for a while. All ranges of throttle would be good and smooth. Until another time... so I would "clean" them again and be fine for next few hundred miles.
    Drives:
    2016 KIA Forte5 SX 1.6 T-GDI, A/T ("cheap GTI" - surprises many drivers) - SOLD...
    2014 FIAT 500e (my first EV - awesome toy!!)
    2015 AUDI Q5 (for wife...)
    2016 FIAT 500X Trekking Plus AWD with Roof and Beats (for wife)

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    Quote Originally Posted by SXTurbo View Post
    Put a set of NGK 1422's in about 500 miles ago. Set the gap on them to .028 as they were about .024 out of the box. I wanted to get some miles on these plugs before talking about them here. So far the biggest difference I notice is much less what I call "Fish Bite" when accelerating through gears.
    So theses plugs (1422) are one step colder then the stock plugs right? So does the car run better, start, MPG, or cooler running?
    Maybe I should change my plugs out?
    LMK.
    Thanks for all your help
    2014 Koup "SX" A/T Silver. Mods; Tint, 6th EE Delete Pipe, Sylvania SilverStar Head, Nokya Fog, Interior LEDs, Debadge (Forte) Trunk-75A Red Dogbone (one side only) Done.

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    Senior Member SXTurbo's Avatar
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    Yes. these plugs are heat range 8. I believe these are the current plugs that come in the 1.6T motors now. These are a definite improvement over the heat range 7 oe plugs. I don't track MPG's as I'm a pretty spirited driver and use the throttle as I see fit. I have very minor mods, hot pipe, cold pipe, k&n drop in, 2nd cat delete and map sensor. The motor is also fully vented to atmosphere. That's about all I'm gonna do at this time as these mods have made some more power and made the motor pull strongly and cleanly. Without these mods I felt a lot of hesitation when accelerating.
    2016 SX Silver
    Build Date 4/16
    In Service 2/13/17

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    Colder, means the spark plug will "release" heat faster, hence running colder.
    MPG will not be affected, or actually may get worse... as the most heat we are talking about happens under large loads, especially low end (full torque).

    Keeping spark plugs colder prevents from predetonation when the spark plug is glowing hot and fresh mixture gets in. Then it reacts like diesel engine and simply gets ignited before ECU wants it to causing power loss and shaking/pinging.

    On the other hand - colder spark plug tends to accumulate residue (most of the time black deposits of unburned fuel). As a result it will start fouling if not cleaned. Self cleaning takes place when the spark plug gets hot enough to burn it off.

    And that is what I believe happens sometimes. Spark plugs do not get hot enough to clean off the residue.
    Initially KIA/Hyundai put the warmer plugs what was fine for lower loads, but under heavy, low end throttle, they started pinging... so they went colder, but then if not pushed from time to time, they will be fouled...
    SXTurbo likes this.
    Drives:
    2016 KIA Forte5 SX 1.6 T-GDI, A/T ("cheap GTI" - surprises many drivers) - SOLD...
    2014 FIAT 500e (my first EV - awesome toy!!)
    2015 AUDI Q5 (for wife...)
    2016 FIAT 500X Trekking Plus AWD with Roof and Beats (for wife)

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