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post #1 of 7 (permalink) Old 02-19-12, 02:30 PM Thread Starter
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04 Mercury Monterey Multiple Misfire

I have an 04 Monterey that i just put new spark plugs and wires in but i still have multiple misfires. I got the codes P0300, P0302, and P0306. What else could this be caused by? Please Help!

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post #2 of 7 (permalink) Old 02-19-12, 02:42 PM
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Re: 04 Mercury Monterey Multiple Misfire

Did you clear the codes and the light came back on? It may be the coil.

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post #3 of 7 (permalink) Old 02-19-12, 02:48 PM Thread Starter
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Re: 04 Mercury Monterey Multiple Misfire

Thanks Bert for the quick reply, I cleared the codes and drove around the block and the codes posted above came back. I will look in the coil pack is there a way to test it to see if that is the problem
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post #4 of 7 (permalink) Old 02-19-12, 03:42 PM
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Re: 04 Mercury Monterey Multiple Misfire

Nothing to test it at home. The coils can crack and that you could see if you took it off and looked real close.

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post #5 of 7 (permalink) Old 02-19-12, 03:44 PM Thread Starter
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Re: 04 Mercury Monterey Multiple Misfire

Ok thanks
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post #6 of 7 (permalink) Old 02-19-12, 09:52 PM
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Re: 04 Mercury Monterey Multiple Misfire

I had the same issue with my 2006 Freestar 3.9L

It was a bad coil pack. I had multiple cylinder misfire codes as well. I thought the engine was toast. Went and got a new coil pack and an hour later poof it ran like new. Good luck, hope this helps. By the way mine was not cracked at all, just worn out.
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post #7 of 7 (permalink) Old 03-06-12, 05:14 PM Thread Starter
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Re: 04 Mercury Monterey Multiple Misfire

I replaced the coil pack and it rean great for 1 day and now i have codes P0193 (fuel rail pressure sensor circuit high input) and P0401 EGR flow insufficient.
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