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I just changed the spark plugs 2012 3.7 eco boost and engine…

Customer Question
I just changed the spark...
I just changed the spark plugs 2012 3.7 eco boost and engine runs very rough under load. Wires and coils hooked up ok. Is it possible that coils were damaged during removal?
Submitted: 2 years ago.Category: Ford
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Answered in 6 minutes by:
2/21/2016
Ford Mechanic: Mastertechuk, Auto Mechanic replied 2 years ago
Mastertechuk
Mastertechuk, Auto Mechanic
Category: Ford
Satisfied Customers: 2,876
Experience: Master tech
Verified

Hi im kevin it unlikely to damage the coils most likely a bad plug have you taken plugs back out and checked them ?not unusual to get the odd plug that so eone has dropped

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Customer reply replied 2 years ago
even reinstall removed plugs that were actually in good condition. No change in misfiring.
Ford Mechanic: Mastertechuk, Auto Mechanic replied 2 years ago

Ok and can you narrow down which cylinder has missfire ?is it missing on idle ?

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Customer reply replied 2 years ago
runs good at idle.
Ford Mechanic: Mastertechuk, Auto Mechanic replied 2 years ago

Ok im gonna opt out dont have hugh coverage of your model another tech will assist shortly

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Customer reply replied 2 years ago
thanks
Ford Mechanic: john -aka eauto, The Car Guy replied 2 years ago
john -aka eauto
john -aka eauto, The Car Guy
Category: Ford
Satisfied Customers: 17,058
Experience: ase tech over 15 years in the field
Verified

any codes? is the engine light on or flashing?

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Customer reply replied 2 years ago
engine light was already on due to a bad catalytic converter yet to be replaced.
Ford Mechanic: john -aka eauto, The Car Guy replied 2 years ago

have you scanned it to see if it has any other codes?

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Customer reply replied 2 years ago
don't have the ability to scan. I'm not a professional
Ford Mechanic: john -aka eauto, The Car Guy replied 2 years ago

does it run well enough to drive to a auto parts store? did you gap the plugs?

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Customer reply replied 2 years ago
plugs are gaped @ .03 as prescribed. truck runs ok if not accelerating new plugs are ford issue and like i said i have switched back to the older ones to see if new ones were faulty but no change.
Ford Mechanic: john -aka eauto, The Car Guy replied 2 years ago

I would drive it to a parts store and have it scanned... hopefully it will have a miss fire code so we can pinpoint the effected cylinder

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john -aka eauto
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