F150 Ecoboost Forum banner

1 - 20 of 27 Posts

·
Registered
Joined
·
114 Posts
Discussion Starter #1
I can't find a definite anwer but I am changing the plugs in my 2012 fx4 with the SP534.

What gap should it be for stock motor and running 87 all the time. They all came at .30 so is that fine to use?
 

·
Registered
Joined
·
1,902 Posts
Mine stock was .045 I never had a problem out of that until I installed a tune. I got mine at 032 most of the guys on here will say 028_030. however most of us are running a tune I would say if you someday in the future plan on using a tune mine as well go with that. if you're not running a tune, I'd say go with somewhere between our advice in what Ford set your OEM to.
 

·
Registered
Joined
·
3,513 Posts
The manual says
".030-.033 in.
.75-.85 mm"

That said, the standard answers I see on here are:
Not tuned .030 in.
Tuned .028 in
 

·
Registered
Joined
·
1,902 Posts
The manual says
".030-.033 in.
.75-.85 mm"

That said, the standard answers I see on here are:

Not tuned .030 in.
Tuned .028 in
Ahha so mine is one of the early ones with the sloppy spark plug gap. Good to know. looks like I will be doing plugs this week
 

·
Administrator
Joined
·
7,736 Posts
My 2013 had 3 plugs gapped at .042.

I can't wait for the new set of plugs to get here....
sounds about where mine were. Took mine out right before getting tuned and put them all down to .030. 45 minute job with a few brews.

Now I have to do my fiance's plugs in her Subaru Forester this weekend. If it was as bad as it was in my Legacy I might need someone to bring over an extra case of beer.
 

·
Registered
Joined
·
114 Posts
Discussion Starter #8
well changed them all out yesterday and surprisingly it took no time to do and was super easy! all went in fine and is driving great.
 

·
Registered
Joined
·
3,513 Posts
You guys made me go and do it. motorcraft sp534 plugs.jpg
 

·
Registered
Joined
·
6,517 Posts
No. Unfortunately I went with OEM.


Doesn't matter.... Probably blow up soon because I don't have a catch can.....




Lol
Stop!



- Stage3-UPR-LET racing league winner!
 

·
Registered
Joined
·
91 Posts
At 59K miles I changed mine. All were wore and gapped about .042-.047 when I took them out. Now the new Motorcraft are all at .031 and now I see about a .5 to 1 mpg gain. The power is back like I remember when I first got it. Tows the 5er better too.
 

·
Registered
Joined
·
14 Posts
After reading alot about plugs and gaps I finally decided to pull mine and check them. My truck is a 2013, mods are Gibson cat back exhaust, CAI, charge tube, 5 star 89 octane tune. All mods done in August 2013...and always got a little stutter off the line. Pulled plugs at 7500 miles, 1 month ago- yeah truck did not get much use for first year due to health-, 3 of my plugs were gapped between .040 and .042. The rest were between .034 and .036. No wonder the stutter. Gapped everything to .030! No more stutter, much smoother acceleration, feels a little quicker, but best of all I am now averaging 18.2 mpg around town and 24 mpg highway! Everyone should check their factory plug gaps. What a difference it made. Was previously getting consistent 16.4 mpg around town and 19-20 mpg on highway. Check Your Plugs...it is actually very easy to do!
 

·
Registered
Joined
·
5 Posts
This is the data I posted in another thread:
I see a lot of opinions on this matter but very little data. Here is some data:


Pre plug change, AVG MPG: 14.2 +/1 0.1mpg (50 city/50 highway); piss poor throttle response, black fowled up tail pipe, missing hesitation the works.
Post plug change, AVG MPG: 18.8 (50/50); Throttle response much improved, no black smoke on startup anymore.


Only change was plugs gaped [just shy] 0.030"
 

·
Registered
Joined
·
360 Posts
Finally got around to checking mine this weekend. 2013 XLT S-Crew with ~13k miles. The plugs looked great and were all definitely in the 0.03X range. I tightened them all up to 0.030 :cool:

13kmiles0030_zps4dabffaa.jpg
 

·
Registered
Joined
·
3,513 Posts
Finally got around to checking mine this weekend. 2013 XLT S-Crew with ~13k miles. The plugs looked great and were all definitely in the 0.03X range. I tightened them all up to 0.030 :cool:

View attachment 23993
Similar results to my 2013 FX4, but mine looked a little worse at 12.5K miles.
My gaps when I pulled them:
1x .032
3x .034
1x .035
1x .036
I changed the plugs for fresh ones anyway and gapped them all to .030 which did not seem to make a noticeable difference in MPG. It does feel a little more stout at full throttle. Whether that is real or perceived, who knows. . .
 

·
Registered
Joined
·
360 Posts
Chose not to replace the plugs yet, I figure they're good until at least 30,000 miles or more. I ran the plugs in my 1995 Ford Ranger (4.0 V6) for over 100,000 miles with no issues.
 

·
Registered
Joined
·
17 Posts
Chose not to replace the plugs yet, I figure they're good until at least 30,000 miles or more. I ran the plugs in my 1995 Ford Ranger (4.0 V6) for over 100,000 miles with no issues.
We are seeing a lot of plug issues at the dealership. A lot of P0300, intermittent runs rough. New plugs is almost always the answer, with at little as 24,000km. We are stock gapping at .030. This GTDI is not the same as a 4.0 N/A
 
1 - 20 of 27 Posts
About this Discussion
26 Replies
20 Participants
Darknight
F150 Ecoboost Forum
F150Ecoboost.net is the best Ford F150 Ecoboost Forum with discussions on 2011+ F150 Ecoboost Trucks. Discuss performance mods, towing questions, wheels, tires, lift kits, and much more!
Full Forum Listing
Top