Charging/Misfire Issue
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This is a discussion on Charging/Misfire Issue within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; OK guys, this car is killing me. I'm getting a misfire codes on all 4 cycl., around 2500-2700rpm is when ...

  1. #1
    Registered User cb6979's Avatar
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    Charging/Misfire Issue

    OK guys, this car is killing me. I'm getting a misfire codes on all 4 cycl., around 2500-2700rpm is when it is most noticeable and also the battery is not charging. My mechanic is saying it is the alt and the battery causing a low volt situation which in turn is causing my misfire. Well, the story is that I have swapped both units, cleaned all battery connections, grounds to the block/chassis, new plugs (.029 gap). Still having issues. Now my question to you guys is:

    A. Related problem?

    B: WTF. I know a fair amount about cars but this has me stumped.

    Any input would help

    again:

    New Batt.
    New Alt
    New Plugs
    Clean term.
    Good Ground
    New Belts

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    OMG WTF MainFrame's Avatar
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    What kind of EM are you running? What did the plugs look like when they came out? Were they white, brown, or black?

  4. #3
    Registered User cb6979's Avatar
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    Well the plugs were a very nice color brown which leads my to believe fuel wise, everything is good. The EM is bone stock. I haven't made it that far yet. As far as the computer, I'm not sure what it is.

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    OMG WTF MainFrame's Avatar
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    Yea, brown is good. Do you have any mods that you're not tuned for?

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    Registered User cb6979's Avatar
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    Just a cold air

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    OMG WTF MainFrame's Avatar
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    Hmm.. that could be causing it to run lean, but with the plugs being brown I wouldn't think that it would be misfiring so bad like that.

  8. #7
    Registered User cb6979's Avatar
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    Yeah it ran fine for 5000 miles on it. I'm out of ideas

  9. #8
    OMG WTF MainFrame's Avatar
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    Maybe bad coil packs?

  10. #9
    Registered User cb6979's Avatar
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    I tried swapping two and four pack as per these forums with no love. I checked them with a mutlimeter when i changed the plugs and they were within spec.

  11. #10
    Moderator timber's Avatar
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    Is the alternator internally regulated on our cars? If not that would be my next guess...
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  12. #11
    Registered User cb6979's Avatar
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    I believe it is. I have put two of them on this car so I have ruled that out. The battery is 3 months old and tested good.

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    OMG WTF MainFrame's Avatar
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    That is perplexing..



    What plugs do you have? I've heard of problems with Champion plugs under boost, but since you're misfiring at 2500-2700rpm I doubt that's the problem.

    Hopefully someone with more knowledge about the issue can chime in.

  14. #13
    Registered User cb6979's Avatar
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    Good ole NGK V-power. I have never had any problems out of them. Humm

  15. #14
    Moderator timber's Avatar
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    I have a feeling that you are going to have to chase down a short ( or I guess it would be an "open") in your case. I would guess somewhere between the alternator/key switch or alternator/starter. What voltage are you reading at the battery with the car running?
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