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Old 12-29-2012, 04:33 PM   #1
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Default Best Replacement Plugs EcoBoost

Ok, I searched and asked in the other spark plug thread, but couldn't find too much in this.

I purchased a 12 EB in Sept. it's been running great, I love the truck. Over 3000 miles on it so far. Now I live in Colorado, where its very dry, so not much a chance for any of the CAC problems here. Anyways, I'm getting my oil changed soon and I figure I'm going to replace and regap all the plugs as a cheap precautionary measure.

It seams there "may" be some issues with the OEM plug quality, so I'm just going to replace them and then gap all to .030

What would be a good high quality plug to use? I heard some saying 1 step colder NGK. Like I said the climate here is very dry, gets very cold in the winters (sub zero) and very hot in the summers (100+).

And finally- will I void any warranty by replacing the plugs with different ones? If that's the case I might just inspect all of them and reace those with new OEM ones.

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Old 12-29-2012, 05:42 PM   #2
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Don't risk the warranty crap and possibility of bad advice from a mechanic on new plugs. Stay with the factory plugs and you will be fine. I have heard of only one spark plug problem on an ecoboost, but it was on a ram forum
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Old 12-29-2012, 05:43 PM   #3
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I regapped my stockers to .030 and its running better than ever.
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Old 12-30-2012, 08:41 AM   #4
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+1 What they said.

Here's what I did and what I learned:

1.) Rough idle/"shudder" -> regapped stock plugs to 0.035. The plugs weren't that far off to begin with, widest gap was 0.038/0.039, can't remember exactly, but they weren't 0.040 like some people found. Didn't help a whole lot.

2.) I put in NGK Iridiums, 1 step colder, gapped at 0.034, truck ran like SHHTTTT worse mileage, poor acceleration. I don't think my EB needed colder plugs. Not only that, they had a weird white residue on all of them.

3.) Cleaned and Regapped stock plugs to 0.030, reinstall. Truck ran good again. No more rough idle. Shudder was still there at 55mph-ish in 6th like most of us had. MPG was back to normal.

My advice? Stick with the stocks, and gap them at 0.030.



On a side note... I've been experimenting with 93 octane. (I found a gas station here that has 93 for only $0.20 more than 87.) From what I can tell, the shudder is significantly less than it was previously with the 87 octane. I hope that helps.
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Old 12-30-2012, 11:40 AM   #5
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I bought brand new stock plugs, set them all at .030. Runs great, however, the cold idle still sucks assss jumps like it has a cam. Once warm, smooth though. The stock ones I took out were all over the place.
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Old 03-18-2013, 02:53 PM   #6
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What is the stock plug #?
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Old 03-18-2013, 08:56 PM   #7
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I'm running NGK LTR6IX-11s. Also, I have tried the LTR7IX-11s which I think felt good. Both sets of plugs run way better than the OEM plugs. All plugs were gapped at .030".
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Old 03-18-2013, 10:22 PM   #8
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I live in Colorado as well. What I researched and found there are two options from Motorcraft. Most websites will say to put in the SP-528 plugs for the EB. My 2013 came with SP-534's. Again both are Motorcraft. I put in the SP-528's this past weekend and gapped them to .030

Truck runs great with either plug (I've tried both)
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Last edited by ECOmax; 03-19-2013 at 08:34 AM.
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Old 03-19-2013, 01:46 AM   #9
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Quote:
Originally Posted by ECOmax View Post
I live in Colorado as well. What I researched and found there are two options from Motorcraft. Most websites will say to put in the SP-528 plugs for the EB. My 2013 came with SP-534's. Again both are Motorcraft. I put in the SP-528's this past weekend and gapped them to .030

Truck runs great
Yes the 534 is the new plug for the '13. Both are made by ngk.
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Old 03-19-2013, 05:58 AM   #10
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Quote:
Originally Posted by ECOmax View Post
I live in Colorado as well. What I researched and found there are two options from Motorcraft. Most websites will say to put in the SP-528 plugs for the EB. My 2013 came with SP-534's. Again both are Motorcraft. I put in the SP-528's this past weekend and gapped them to .030

Truck runs great
Why did you change your plugs on a 2013 and why to the old style plug?
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