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Old 04-02-2019, 06:22 PM   #1
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2011 ford focus sel P301 code rough idle at stand still

Ok heres what i know roughly 600 miles ago had the oil changed they put in 5w 30 instead of 5w 20...

No issues for a thousand miles then all of a sudden this code pops

Took ignition coils off there is a definite leak in cylnder 1-2-3 only cylnder one is misfiring changed plugs ans wires recently.

The other three cylnders are no more oil fouled then cylnder one .

And the last monkey wrench idiot wife ran it down to 4 miles left till e which is something i never do.

Carbon build up in spark plug area one no real build up else where.


Suggestions fixes possible cause only has po301 code.


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Old 04-02-2019, 07:34 PM   #2
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Well number one the oil they put in has nothing to do with it that's what I run in my car. 5W20 is for maximum fuel efficiency nothing more. The leak that you have is from the valve cover gasket very common on these cars. Switch ignition coils with a different cylinder clear code and see if the misfire moves.
What spark plugs did you put in? Also the car does not have wires those are coil boots.

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Old 04-02-2019, 08:32 PM   #3
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I was just concerned with the carbon build up in one but i guess if its misfiring its probably due to that i ordered a valve cover and kit since this will be the second time doing the gasket i know they are a common problem

I used iridium plugs from ngk
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Old 04-02-2019, 09:50 PM   #4
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Well hopefully it's just a bad ignition coil.

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