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In preparation for getting a tuner I want to go ahead and change the plugs. I don't intend to overly modify my truck just a drop in filter and tuner. My truck will be used mostly for daily driving and towing and I will run mostly 93 oct. Since its only .10 more than 89. The tune I intend too run the most would be a performance street type tune. What plug should I use...I have seen a lot about the Motorcraft plugs for the 13s gapped at .030...would this be best? I don't need brisk. My truck is a 2011
 

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If you don't want the Brisks, get the Motorcraft SP-534's and gap to .030. If you get any spark blow out or surge, you can drop to .028. I have a 13 and my truck like the .028 gap.
 

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0.28 my truck idles smoother than 0.30. Also took a slight miss at 6k out.

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Do you need to have a tuner to gap at .30-.28?
No. However, unless you are having misfire issues there is no need. More cylinder pressure produced by the changes in calibration provided by a "tune" requires a smaller gap in order to ensure good spark with the limited factory ignition system.
 

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Just do it, your mpg will improve a bit. For some reason ford did a horrible job with the plug gaps. Mine were at .044-.047, it was a big improvement.


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I have a a slight hesitation problem when starting from a complete stop. And didn't know if I could change the plugs and gap them different.
 

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This is lean misfire. A smaller gap usually helps (stock use .
035, modified use .028). So would a bit more fuel on acceleration.
 

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Ok I will check them and change. I have no tuner. So I just wanted to make sure I could lower the gap and not hurt anything. Thx
 

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My ford dealer told me for my stock 2012 that it changed to CYFS12YT3. Is this info correct? Haven't heard much about those at all on the forums.


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Just picked up some Motorcraft sp-534's and they all came gapped to .034 re gapped to .028.. What gap do all you guys with tunes run?
BTW I bought them off rockauto for around $4 per plug shipped 3 days
 

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Just picked up some Motorcraft sp-534's and they all came gapped to .034 re gapped to .028.. What gap do all you guys with tunes run?
BTW I bought them off rockauto for around $4 per plug shipped 3 days
I'm down to 0.025" just because...lol
 

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I'm at .028 on my Brisk.
 

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This is lean misfire. A smaller gap usually helps (stock use .
035, modified use .028). So would a bit more fuel on acceleration.
Wrong. It's misfire caused by spark blowout from the increased boost. The smaller gap does wonders.

A lean condition will lead to detonation. I run mine at .025--sp534's. The brisk plugs have proven to have quite a few failures, seems like they are even more susceptible to overtightening than the Motorcrafts.
 
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