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I own a 2011 MKX. A speeds between 55mph and 65mph it

I own a 2011...

I own a 2011 MKX. A speeds between 55mph and 65mph it misses. When I go below 55 or above 65, around 70mph, the car runs OK. Sometimes when I am in the narrow 55 to 65 range, the check engine light flutters.

Mechanic's Assistant: Does the light stay on, or does it blink?

I only blinks.

Mechanic's Assistant: Are you fixing your MKX yourself? What have you tried so far?

No I am not planning to fix it. I would just like to get some idea on what is going on before I take it to a repair shop.

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Answered in 2 minutes by:
3/16/2018
Ironmike
Ironmike, ASE Master Tech, L1
Category: Car
Satisfied Customers: 3,452
Experience: 30 years GM certified, Ford certified
Verified

greetings,

did you check for trouble codes? how many miles? many parts places will scan for free.

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It is possible that one of the COP(coil over plug) may be failing. If the vehicle is diagnosed at a shop or dealer with an advanced scanner than can watch live data and verify any misfires and what cylinders.

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the shop could swap the suspected cylinder with another to see if it is the coil or spark plug.

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s​o It could be the vehicle needs the spark plugs and or an ignition coil.

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From my experience these newer spark plugs from ford only last around 50k

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let me know if you get the trouble codes

Ironmike
Ironmike, ASE Master Tech, L1
Category: Car
Satisfied Customers: 3,452
Experience: 30 years GM certified, Ford certified
Verified
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