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2013 SHO Misfires under heavy load

Started by topazoboom, June 12, 2018, 05:06:19 PM

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topazoboom

June 12, 2018, 05:06:19 PM
Hello everyone,  hoping someone can help as this has me stumped.

Under heavy load I get misfires on cylinder 2,3,4,5,6, but driving around with half throttle I have full power and runs smooth.
The car idles fine, some stuttering when the car is cold, but its done that since I bought it in 2013.

Has anyone experienced this or something similar?

Thanks in advance

SHOdded

#1
June 12, 2018, 06:18:04 PM
Sorry to hear!  How many miles on your SHO?  When were plugs last done?  Do you get any fuel smell?  Cleaned the MAP. And IAT sensors?  Checked intercooler for buildup?
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

topazoboom

#2
June 12, 2018, 08:59:46 PM
I am doing plugs tomorrow, 106k km on it, I will check the sensors too, Thanks

SHOdded

#3
June 12, 2018, 10:31:12 PM
Post pics of the old plugs please :)  SP534's for the new ones, or ...?
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

ZSHO

#4
June 13, 2018, 07:19:19 AM Last Edit: June 13, 2018, 07:23:03 AM by ZSHO
Welcome aboard the E.B.P.F!  Is this for your 13-SHO!
Agreed with SHOdded ^^^ and check the plugs &  (COP).
It makes you wonder if the original Motorcraft platinum plugs are still installed.  Z


2013 Performance Package SHO| Livernois Custom Methanol Tune|3-Bar Map|Reische-170-Stat|Full Race Tial-10psi BOV in Black|PPE-Gloss Black Hot Pipes|EPP Dual Intake in Gloss Black|PPE Catted DP|Corsa Sport Cat Back Exhaust|H&R Sport-Springs|CFM Performance Billet Valve Cover Breather In Gloss Black|Llumar 20%Ceramic window Tint|MSD Ignition Coils in Black|Extreme Roof Spoiler|Redline Fluids all around|Gearhead Intercooler|First-SHO With Direct Port Alky-VP-M1-100%-Methanol Injection|LMS-Custom-Dyno-Tuned @ 415whp-465wtq| Best Trap Speed of 115.54 mph|

topazoboom

#5
June 13, 2018, 08:57:47 PM Last Edit: June 13, 2018, 09:23:21 PM by ZSHO
Changed the plugs, checked the MAP and IAT sensors, looks like it was the plugs, full power under full throttle again.  Tha kas for the assistance guys.  Hopefully the attached picture comes through.

ZSHO

#6
June 13, 2018, 09:27:00 PM Last Edit: June 13, 2018, 09:29:54 PM by ZSHO
It looks like the plugs needed to be changed IMO! hopefully its a permanent viable fix....BTW Fixed the above PIC for ya & Best of luck.  Z   :)


2013 Performance Package SHO| Livernois Custom Methanol Tune|3-Bar Map|Reische-170-Stat|Full Race Tial-10psi BOV in Black|PPE-Gloss Black Hot Pipes|EPP Dual Intake in Gloss Black|PPE Catted DP|Corsa Sport Cat Back Exhaust|H&R Sport-Springs|CFM Performance Billet Valve Cover Breather In Gloss Black|Llumar 20%Ceramic window Tint|MSD Ignition Coils in Black|Extreme Roof Spoiler|Redline Fluids all around|Gearhead Intercooler|First-SHO With Direct Port Alky-VP-M1-100%-Methanol Injection|LMS-Custom-Dyno-Tuned @ 415whp-465wtq| Best Trap Speed of 115.54 mph|

SHOdded

#7
June 13, 2018, 10:31:29 PM
X2, hoping this is THE fix.
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

TopherSho

#8
June 14, 2018, 10:24:25 PM
Quote from: topazoboom on June 13, 2018, 08:57:47 PM
Changed the plugs, checked the MAP and IAT sensors, looks like it was the plugs, full power under full throttle again.  Tha kas for the assistance guys.  Hopefully the attached picture comes through.


that looks familiar.. i had that happen in about 12k miles when i ran 1 stage colder plugs.
2010 non-pp, 98k miles, 3-bar,  .026 plugs, SNOW-KIT STG1, AJPTurbu tune#35, 15.5+psi
Best 0-60 public road 4.35s
Best 1/4 of 12.61 no DA correction
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