Spark plug gap - What was/is yours?

Spark plug gap - What was/is yours?

This is a discussion on Spark plug gap - What was/is yours? within the F150 Ecoboost Chat forums, part of the F150 Ecoboost Forum category; Howdy, fellers! With all the sometimes drastic and varying differences in reported spark plug gaps from the factory, I decided to check the plugs on ...

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Thread: Spark plug gap - What was/is yours?

  1. #1
    Ecoboost Regular dewserb's Avatar

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    Spark plug gap - What was/is yours?

    Howdy, fellers!

    With all the sometimes drastic and varying differences in reported spark plug gaps from the factory, I decided to check the plugs on my '14 today. Considering all the stories I've read where the factory gaps were all over the place, I expected at least some degree of variance.

    Before starting, I decided to set the gap to .028 because folks have reported good performance with it. Lo and behold, every plug was already dead on .028.

    Granted, the worst cases I've seen where the gapping was all over the board were from '11s and '12s. However, I've seen several degrees of variance in later models as well.

    So, what were your gaps when you checked/changed the plugs, and what did you change them to?

    Thankee!

    2014 F150 Blue Flame FX4 SCREW Ecoboost
    275/65/20 Cooper Zeon LTZ
    3 10" RF P3s and 1000 watt RF amp
    STX grill
    Undercover Lux

    87 Octane...Never had it....Ha ha haaaa....Never will!

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    Eco-Beast scap99's Avatar

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    Factory plugs were set at 32 thousandths.
    Running a 24 thousandths gap now.
    '13 FX4 3.55 LET Tuned
    Stock Turbos = 451hp/532tq

    58mm Turbos = 482hp/591tq

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    Eco-Beast Vozaday's Avatar

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    .028
    2013 F150 FX4 Appearance Loaded Eco. w/Max Tow. Level lift with 305/55r20 Open Country ATII Extremes. Rear Raptor Shocks. 5 Star Tuned/X4. Wagner Intercooler. AFE Stage 2 Intake. RX Catch Can/UPR CSS. Boost-Bars Raptoid Grille. 30" Hanning LED Bar. Rigid Backup Lights. JW Speaker Fogs. GlowShift Boost Gauge. Remote Access.

    1971 Mustang Grande 351C

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    Eco-Beast norcal_ecoscrew's Avatar

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    .028
    2012 XLT SuperCrew Ecoboost 4x4, 3.31 Rear, 5.5 Box, Ingot Silver Metallic
    -Fox 2.0 Coilovers, Icon UCA's, Billstein 5100 Rears, Roadmaster Active Suspension
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    F150Ecoboost.net Decal

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    Ecoboost Veteran Trailboss's Avatar

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    Posted this page 7 of:

    Poor Mileage issue on my F150 Ecoboost - Help Please

    I did a test with my stock tune truck. Ran the plugs at .035 gap got 22.5 hwy, 18.5 town/country. Ran the plugs at .030 gap, got 20.6 hwy, 15.8, town and country (hand calculated, not computer). I am going back to .035 tomorrow. I will report mileage after couple of weeks. I am starting to believe that plug gap is dependent on tune. .032-.035 is maybe fine for stock, while .025-.028 may be better for a hotter tune. I think possibly that with out the hot tune a cold plug is very inefficient in fully combusting the fuel, leading to poorer fuel economy and increased fuel dilution and a stock tune needs a little hotter plug Time will tell... still testing.
    agentjohnson likes this.
    IF you plan on keeping your truck, SAVE YOUR ENGINE... USE A FULL SYNTHETIC OIL!
    Engine: Amsoil ASL 5W-30 Engine Oil.[/URL] Oil Filter: Amsoil BMK-23 Dual Remote Bypass system. Transmission: Amsoil ATL Transmission Fluid. Transfer Case: Amsoil ATF Transmission Fluid. Front Diff: Amsoil SVT 75W-110 Gear Lube. Rear Diff: Amsoil SVO 75W-140 Gear Lube.

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    Ecoboost Sr Member parreda's Avatar

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    .025 runs perfect stock or tuned
    Last edited by parreda; 01-26-2015 at 09:37 PM.

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    Eco-Beast Sherman's Avatar

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    Probably .030

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    Eco-Beast 2Canches's Avatar

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    New sp534 outta the box were 0.030. They are working


    Sent from my silver iPad Air 1 in a http://www.red.org/en/ smart case using an app called Tapatalky
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    http://www.leadingedgetuning.com 91 tune & 87 tow tune

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  10. #9
    Ecoboost Regular ktm621's Avatar

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    Quote Originally Posted by parreda View Post
    .025 runs perfect stock or tuned
    I'm at .28 right now with custom tune, if I went to .25 how much better would be in your opinion?

  11. #10
    Ecoboost Pro coyconner1983's Avatar

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    At 40k miles i changed mine and they were around .035 to .038.. Was getting a surging issue when full throttle.. Gapped new plugs at .030 and truck has been running great
    2017 XLT 302a 3.5/10 speed, FX4. Only Mod Sport Grill with Painted Surround. More coming soon

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