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Spark plug condition

Discussion in 'General 4Runner Talk' started by FLA4Runner, Oct 5, 2024.

  1. Oct 5, 2024 at 4:12 PM
    #1
    FLA4Runner

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    FLA4Runner [OP] New Member

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    Hey Everyone, just changed out the plugs and coils on my '09 4Runner 4.0L. Curious what you guys think of the plugs I pulled out. Not sure why someone would put Autolite spark plugs in this 4runner...
     
    FLA4Runner, Oct 5, 2024
    #1
  2. Oct 6, 2024 at 4:59 PM
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    TrailSpecial22

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    TrailSpecial22 New Member

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    agreed. Gaps look huge on them as well. Go with Denos imo. 4th plug from left doesnt look like it was torqued to spec.
     
    TrailSpecial22, Oct 6, 2024
    #2
  3. Oct 6, 2024 at 6:24 PM
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    Noodles

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    Noodles New Member

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    What’s wrong with OEM? I never understood. Especially when the parts are not expensive and you usually replace them every 100k miles.
     
    Noodles, Oct 6, 2024
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    FLA4Runner[OP] likes this.
  4. Oct 6, 2024 at 7:06 PM
    #4
    TrailSpecial22

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    TrailSpecial22 New Member

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    arent the factory plugs denso iridiums?
     
    TrailSpecial22, Oct 6, 2024
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    wildgoose and FLA4Runner[OP] like this.
  5. Oct 7, 2024 at 10:29 AM
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    FLA4Runner

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    FLA4Runner [OP] New Member

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    No idea, I bought NGK this time. I had heard on some 4.0 models they are NGK on one side and Denso on the other from the factory?
     
    FLA4Runner, Oct 7, 2024
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  6. Oct 7, 2024 at 10:32 AM
    #6
    FLA4Runner

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    FLA4Runner [OP] New Member

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    No idea, I think they are a mix of NGK and Denso from the factory but mine had already been changed out.
     
    FLA4Runner, Oct 7, 2024
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    TrailSpecial22[QUOTED] likes this.
  7. Oct 7, 2024 at 10:58 PM
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    Trekker

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    Trekker Regular Member

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    Man I hate autolites. The gap looks too big, and they were overdue for a change. It appears your valve covers are leaking because is that oil on the middle plug?
     
    Trekker, Oct 7, 2024
    #7
  8. Oct 8, 2024 at 12:09 PM
    #8
    Lou

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    Lou New Member

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    Possible they took it to a shop that did not use OEM or they live in a town with auto parts stores but no dealer. Personally, I'd plan ahead and order some. But if I decided to do it this afternoon, I can be at an Auto Zone, O'Reilly's or NAPA in 5 minutes. The dealer is almost 3 hours round trip.
     
    Lou, Oct 8, 2024
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