FordPerf Addict
FRF Addict
- Joined
- Aug 24, 2016
- Posts
- 1,333
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- 530
And what’s the stock gap.. how could ford get this wrong on a stock truck?
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Anyone getting benefits with these on stock tunes ?
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I think I’m starting to notice that... I feel it happens because it’s a Cold motor and 89 fuel tho, I’ll have to pay more attentionYes. I think I already posted. I was getting some knock/pinging on occasion depending on conditions & also sometimes experienced “stuttering” @ WOT acceleration, not like a drop off in power but like subtle sputtering/choppy acceleration as power built especially in upper ranges.
These plugs fixed that immediately- idles smoother too. Worth the $65 spent easily.
I’m so confused. Is the stock plug a 550?
Oh hell yeah these engines HATE low octane. Haven’t been putting anything but 93 in mine once I burnt through the dealers fuel....I think I’m starting to notice that... I feel it happens because it’s a Cold motor and 89 fuel tho, I’ll have to pay more attention
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I’m mostly highway cruising and pretty easy on it, But when i offroad or were to tow I always throw prem in. In the summer I didn’t notice any of the hesitation thoOh hell yeah these engines HATE low octane. Haven’t been putting anything but 93 in mine once I burnt through the dealers fuel....
SP-550 is stock on certain build dates
What build dates? And what is the other stock plug(s)?
The original plugs on my early build 2017 were gapped @ .028 I checked them when my truck was fairly new. I replaced them around 20K miles with SP550's and they came pre-gapped @ .028I just got around to changing my original OEM plugs to M1240535T, Ford Performance’s part number for the colder SP542 which is now hard to find.
I ordered my plugs from Steeda, since they were the lowest delivered price at the time. They came out of the box gapped between .025 and .027. I gapped all as close to .028 as I could.
The OEM plugs that came out of my April 2017 build look to be the SP550 if New Nick at JDM’s info above is correct since the part number on the plug CYFS12YPCT. After 21,200 miles they all came out evenly gapped, at .028 surprisingly since I believe the manual states .031.
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