Stock Spark Plug replacement

Discussion in 'Generation 4 - Maintenance & Troubleshooting' started by Frostbrosracing, Jul 8, 2020.

  1. Frostbrosracing

    Frostbrosracing #FreeRyanSelcer

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    Hey guys I need some help. I did some reading through the forums before I bought my replacement spark plugs. Because my car had right at 70K when I bought it I figured I'd replace the plugs because there was no history of them having been done yet. Here's what I bought and installed: Motorcraft Iridium SP-580 gapped at .032. I replaced the boots and the springs that contact the plugs at the same time. I'm going to replace the plugs when I go with my new tune and 3 bar MAP but am I set up correctly until then? I've seen that the gap on the colder plugs is usually set about .026. Should I be at the same gap, and if so have I lost power with my current set up? Thank you :)
    2013 non-PP
     
    Last edited: Jul 8, 2020
  2. ridered74

    ridered74 SHO Member

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    Gap is correct at .026 for tuned vehicles. SP542 is what most people used to use until they stopped making it. The SP-580 isn't quite the same heat range if I remember correctly tho. What most of us who have been forced to switch use are the M-12405-35T plugs.
     
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  3. Frostbrosracing

    Frostbrosracing #FreeRyanSelcer

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    Thank you. I got my number from Rock Auto as a replacement for the superceded 534 which I believe superceded the original 528 spec.
    Screenshot_20200708-224702_Chrome.jpg
     
  4. ridered74

    ridered74 SHO Member

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    Ya that's fine if you are running stock, but if you are tuning it you should check with your tuner and see what they recommend for plugs.
     
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