Spark plug replacement? - Page 12

Spark plug replacement?

This is a discussion on Spark plug replacement? within the F150 Ecoboost Maintenance forums, part of the F150 Ecoboost Garage category; Sorry if this has been answered already, but I recently added SCT Livewire TS to my truck and wanted to know if I should change ...

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Thread: Spark plug replacement?

  1. #111
    Ecoboost Jr Member Pitbull2o08's Avatar

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    Sorry if this has been answered already, but I recently added SCT Livewire TS to my truck and wanted to know if I should change my plugs to a colder step or smaller gap? I bought the truck 2 years ago at 27k miles, changed plugs with OEM FOMOCO ones then. Should I change this semi new plugs now? I have 57k miles now. Thanks

  2. #112
    Eco-Beast ptown's Avatar

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    Quote Originally Posted by Pitbull2o08 View Post
    Sorry if this has been answered already, but I recently added SCT Livewire TS to my truck and wanted to know if I should change my plugs to a colder step or smaller gap? I bought the truck 2 years ago at 27k miles, changed plugs with OEM FOMOCO ones then. Should I change this semi new plugs now? I have 57k miles now. Thanks
    Yes you should sp534 gapped to 0.28-0.3 every 15k max


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  3. #113
    Ecoboost Jr Member Pitbull2o08's Avatar

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    Thank you very much. Got some ordered

  4. #114
    Ecoboost Jr Member Aandrews109's Avatar

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    Changed my plugs yesterday. 116,500 and was still running very well. Started having some minor misfiring when started in the morning and at higher RPM's. Here's a picture of the old plugs that were all gapped between .040 to .045.
    Name:  IMG_3964.JPG
Views: 74
Size:  1.50 MB
    2013 XLT SCrew 4x4 - 3.5 Ecoboost, Oxford White - 355 gears
    2.5" Rough Country Level
    18 x 9" Worx 803 Beast in PVD - 275/65 R18 Goodrich KO 2's
    Billstein 5100's on Rear
    Banks CAI
    Banks Derringer Tuner
    Banks I-Dash Gauge
    Banks Monster Exhaust


    1993 F-150 Lightning - Red
    5.8 Liter - 410 gear
    Cervini Ram Air Hood
    Motor Sport Headers w/ Magnaflow Exhaust

  5. #115
    Eco-Beast meaz93's Avatar

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    Where's Mike Rowe! If that is your first spark plug change...umm their better be a Ford promo commercial coming your way.....staring you and your Boost-?!

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  6. #116
    Gold Supporting Member snakebitten's Avatar
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    He's been a member for a loooong time!

    We should know so much more about this truck than we do. Lol

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    2018 KingRanch Kingsville Edition- Gen2 3.5 - Runs SO good on Factory tunes. Simply amazing. Good Job Ford

  7. #117
    Ecoboost Master GearHead_1's Avatar

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    Quote Originally Posted by Aandrews109 View Post
    Changed my plugs yesterday. 116,500 and was still running very well. Started having some minor misfiring when started in the morning and at higher RPM's. Here's a picture of the old plugs that were all gapped between .040 to .045.
    You’ve had this truck since new?
    A society willing to trade liberty for temporary security deserves neither and will lose both
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  8. #118
    Ecoboost Jr Member Aandrews109's Avatar

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    Bought it new in January of '13. A lot of highway miles and as much as possible Chevron gas. Until a little over a month ago, my commute to work was 20 miles on the highway each way. It's been a really good truck. Only issue has been a heater core issue at about 80,000 miles. Other than that, nothing other that normal wear and tear.
    snakebitten likes this.
    2013 XLT SCrew 4x4 - 3.5 Ecoboost, Oxford White - 355 gears
    2.5" Rough Country Level
    18 x 9" Worx 803 Beast in PVD - 275/65 R18 Goodrich KO 2's
    Billstein 5100's on Rear
    Banks CAI
    Banks Derringer Tuner
    Banks I-Dash Gauge
    Banks Monster Exhaust


    1993 F-150 Lightning - Red
    5.8 Liter - 410 gear
    Cervini Ram Air Hood
    Motor Sport Headers w/ Magnaflow Exhaust

  9. #119
    Eco-Beast Grim Reaper's Avatar

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    Quote Originally Posted by Aandrews109 View Post
    Changed my plugs yesterday. 116,500 and was still running very well. Started having some minor misfiring when started in the morning and at higher RPM's. Here's a picture of the old plugs that were all gapped between .040 to .045.
    Name:  IMG_3964.JPG
Views: 74
Size:  1.50 MB

    Your misfire was probably caused by the wide gap. Stock, your gap was probably closer to .035 (mine was). But over time, the gap will widen, which boosted engines don't like (unlike N/A engines, which do like a wide gap).

    I bet if you tightened your gap under .030, those plugs would run just fine. I personally prefer and use .025". The truck runs smooth and the narrow gap gives me some leeway when the gap starts to widen.
    2013 F-150 4x4 Supercab 145"WB Ecoboost XLT, Group 302A, XTR Trailer Package, E-Lock 3.55s ...
    Bolt-ons Installed:
    Banks CAI, Wagner CAC, Full Race Catted Downpipes, Custom 3" exhaust w/3" Flowmaster dBX Muffler
    Tuned by Torrie McPhail at www.unleashedtuning.com 91+ Octane 535 RWTQ @ 2750 / 372 RWHP @ 4900 - (Mustang Dyno)
    Mods (Waiting): Mishimoto Hardpipes, Tifosi Ported & Ceramic Coated Exhaust Manifolds, Full Race GT Turbos & SPD Ported Adapters



  10. #120
    Ecoboost Jr Member Aandrews109's Avatar

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    I'm sure the gap definitely increased over time. I used SP534's as replacements and set the new plugs at .028. Haven't had a chance to lean on it yet, but just general driving is definitely improved.
    2013 XLT SCrew 4x4 - 3.5 Ecoboost, Oxford White - 355 gears
    2.5" Rough Country Level
    18 x 9" Worx 803 Beast in PVD - 275/65 R18 Goodrich KO 2's
    Billstein 5100's on Rear
    Banks CAI
    Banks Derringer Tuner
    Banks I-Dash Gauge
    Banks Monster Exhaust


    1993 F-150 Lightning - Red
    5.8 Liter - 410 gear
    Cervini Ram Air Hood
    Motor Sport Headers w/ Magnaflow Exhaust

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