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I have a 2002 Mercury Mountaineer that just started to give…

Hello,I have a 2002 Mercury...
Hello,I have a 2002 Mercury Mountaineer that just started to give me problems yesterday. The truck has driven great since I purchased it almost 2 years ago but just yesterday the engine started to misfire. My code reader says it’s a P0304, cylinder 4 misfire. Does this mean I need to change the spark plugs? Or would it be the ignition coil since it’s only cylinder 4 that had the problem? Also how often do spark plugs need to be changed?
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1/13/2018
Mike V.
Mike V., Automotive Technician
Category: Mercury
Satisfied Customers: 27,800
Experience: 25 years experience witth all makes, Nissan and Subaru factory trained.
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Typically when you only have a single cylinder misfire that particular coil is the problem. There can be other issues causing the code, intake manifold leaks or something going on inside the engine, but for the most part the single cylinder misfire code is the coil.

As for how often the plugs should be replaced, I need the engine size to get you that information.

Please let me know if there is anything else I can do to help.
Just Answer does not compensate me for my time and resources, so please rate my answer by using the stars at the top of the page. Payment for your question includes any follow-up questions you may have. Free trials and subscription questions still require ratings. Your question does not close after you rate. You will still be able to contact me.
Thank you so much!

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Customer reply replied 7 months ago
Hi Mike
Customer reply replied 7 months ago
thanks you I have the v8 engine

Sorry for the delay, digging out up here!

These plugs are platinum and should be replaced every 60k

Mike V.
Mike V., Automotive Technician
Category: Mercury
Satisfied Customers: 27,800
Experience: 25 years experience witth all makes, Nissan and Subaru factory trained.
Verified
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Customer reply replied 7 months ago
ok great thank you

You are very welcome and thank you for the rating!

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