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Help With Error Code P0303 #3 cyl Misfire

Discussion in '1994-2004 V6 Mustang Tech' started by Crash1976, Jan 13, 2009.

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  1. Crash1976

    Crash1976 New Member

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    So my check engine light has been on for a few weeks on my 96 3.8 and it has seemed to be running fine. But I decided to swing in to AutoZone and have them run the code since i was picking up the Celica's gaskets and the code came back P0303 Cyl #3 Misfire. They gave me a list of possible problems.
    1- bad plug
    2- bad plug wire
    3- bad coil pack
    I think there are some other possibilities, but i'm not sure. Has anyone else experienced this and how'd you fix it? The thing that gets me is that the car runs fine other than the check light being on the dash. Makes me think the problem is intermitent and not constant, wich might make it more difficult to track down.
  2. taylor0987

    taylor0987 New Member

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    test your coil pack using an ohmmeter. if you do not own one, either buy or borrow one. it is inexpensive and could save you from needlessly replacing expensive parts.

    remove the spark plug wires keeping track of the wires (consider labeling them if you need to)
    measure the resistance between the following pairs of posts on the coil pack
    1 and 5
    2 and 6
    3 and 4.
    post the results
  3. Crash1976

    Crash1976 New Member

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    I have a multi meter that measures ohms. i assume these tests are performed with the engine off?
  4. 2KSTANGFIRE

    2KSTANGFIRE New Member

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    Unless you have an Ohm meter that can handle being hit with 30,000+ Volts :eek:, then yes, engine off. You are measureing the resistance of the coil.

    [​IMG]
  5. Crash1976

    Crash1976 New Member

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    sweet, thanks for the instructional photo. Your photo shows 13.42 ohms, is that representative of a good coil pack? Less or more resistance would equal a failing coil pack?
  6. 963.8

    963.8 Retarded User

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    I had a Cylinder 1 misfire and it was my Cam Position Sensor. It would probably show up when you got your codes read.
  7. taylor0987

    taylor0987 New Member

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    I thought you said your p0301 came back after you replaced the cps.
    http://www.v6mustang.com/threads/238058/
    Last edited by a moderator: Oct 23, 2013
  8. 2KSTANGFIRE

    2KSTANGFIRE New Member

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    ~11K to 13K is good. Anything less then 10K would be bad.
  9. 963.8

    963.8 Retarded User

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    It went bad again. I replaced it with a Borg-Warner. Haven't had trouble since.
    Last edited by a moderator: Oct 23, 2013
  10. systemloc

    systemloc New Member

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    I had a cylinder misfire due to a burned through spark plug cable. It was quite obvious, though, because the cylinder was dead, and the engine was running incredibly rough. Not something you want to drive on!