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  1. #1
    I'm bringing Zetec back... REVSWIN's Avatar
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    Default CEL: PO301 - Cylinder 1 misfire

    P0301 through P0310 - Misfire Detection Monitor The misfire detection monitor is designed to monitor engine misfire and identify the specific cylinder in which the misfire has occurred. Misfire is defined as lack of combustion in a cylinder due to absence of spark, poor fuel metering, poor compression, or any other cause. Ignition system
    Fuel injectors
    Running out of fuel
    EVAP canister purge valve
    Fuel pressure
    Evaporative emission system
    Base engine
    The MIL will blink once per second when a misfire is detected severe enough to cause catalyst damage. If the MIL is on steady state, due to a misfire, this will indicate the threshold for emissions was exceeded and cause the vehicle to fail an inspection and maintenance tailpipe test.


    Problem car is 2000 ZTS, Zetec, 136k miles. Has new fuel filter.

    Ok so I finally got a CEL after a month of the car bogging, lack of power, etc. I did not drive the car much, mainly just to test drives after I replaced the ignition coil and the fuel filter.

    So now that I know the code, P0301 - Cylinder 1 misfire, where do I start looking? I have new spark plugs that I have been too lazy to put jn, but will as soon as I find my gapper. After that would the injectors be a likely cause?
    Last edited by REVSWIN; Jan 8, 2008 at 8:26 PM.
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  2. #2
    Senior TEAM Member G-forces's Avatar
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    Default Re: CEL: PO301 - Cylinder 1 misfire

    You're on the right track, spark, fuel; just follow the list down. Although, I don't see what any of the things after "running out of fuel" are going to do for a single cylinder misfire. You might want to check compression first though, it's cheaper.
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  3. #3
    I'm bringing Zetec back... REVSWIN's Avatar
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    Default Re: CEL: PO301 - Cylinder 1 misfire

    Picked up the motorcraft plugs, we'll see...
    2001 B7 fOCUS ZX3 powerworks
    2002 B2 fOCUS ZTW

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  4. #4
    I'm bringing Zetec back... REVSWIN's Avatar
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    Default Re: CEL: PO301 - Cylinder 1 misfire

    Ok, put the new Motorcraft spark plugs in and it still bogs and stumbles. It idles a little smoother, and the bogging is not as bad but it is still a problem.

    I had a 1/4 tank of gas, which has been in there for over a month so I filled up with new gas.

    I guess I will have to check the compression and the fuel injectors next.
    2001 B7 fOCUS ZX3 powerworks
    2002 B2 fOCUS ZTW

    CCW I Forgeline I OZ Racing I P5

  5. #5
    I <3 UC^3
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    Default Re: CEL: PO301 - Cylinder 1 misfire

    How do the wires look coming into the coil? Any missing insulation or frays?
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  6. #6
    I'm bringing Zetec back... REVSWIN's Avatar
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    Default Re: CEL: PO301 - Cylinder 1 misfire

    They look fine to me.
    2001 B7 fOCUS ZX3 powerworks
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  7. #7
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    Default Re: CEL: PO301 - Cylinder 1 misfire

    if that doesnt work get a new coil pack
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  8. #8
    I'm bringing Zetec back... REVSWIN's Avatar
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    Default Re: CEL: PO301 - Cylinder 1 misfire

    Quote Originally Posted by kennan J
    if that doesnt work get a new coil pack
    It has a new fuel filter and ignition coil.
    Last edited by REVSWIN; Jan 8, 2008 at 8:27 PM.
    2001 B7 fOCUS ZX3 powerworks
    2002 B2 fOCUS ZTW

    CCW I Forgeline I OZ Racing I P5

  9. #9
    I'm bringing Zetec back... REVSWIN's Avatar
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    Default Re: CEL: PO301 - Cylinder 1 misfire

    The only thing I have not check was the fuel injectors, I am about ready to just bring it into the dealer to find out what it is.
    2001 B7 fOCUS ZX3 powerworks
    2002 B2 fOCUS ZTW

    CCW I Forgeline I OZ Racing I P5

  10. #10
    I'm bringing Zetec back... REVSWIN's Avatar
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    Default Re: CEL: PO301 - Cylinder 1 misfire

    Just so people know who get this code, it was most likely the spark plug wire that was bad. Since the car had 135k on it, I ordered new spark plugs and wires from Tousley. It runs perfect now.
    2001 B7 fOCUS ZX3 powerworks
    2002 B2 fOCUS ZTW

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