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Thread: Massive misfire cylinder 1 -- SOLVED (wire corrosion)

  1. #21
    Senior Member Cobrajet's Avatar
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    Quote Originally Posted by Top_Fuel View Post
    Well...keep in mind that's not the ideal way to tell if you've got good spark on a cylinder.
    Perfectly good way to check for a DEAD coil, though.



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    Senior Member Cobrajet's Avatar
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    Hmmm....so it's a misfire on #1, eh? With good compression, good coils, good injectors. Could it be MIVEC related?

    It is sounding more and more like the ECM. Maybe it got damp/wet with the weather?

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    Moderator Eggman's Avatar
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    Doesn't MIVEC adjust all cylinders' valves simultaneously? I think we can rule out MIVEC.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 49.7 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.7 mpg (Imp)


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    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by Cobrajet View Post
    Perfectly good way to check for a DEAD coil, though.
    LOL...good point.

    It doesn't sound like this is a coil issue anyway...I was just putting that video out there for informational purposes. Most people have probably never heard of a spark tester.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 51.3 mpg (US) ... 21.8 km/L ... 4.6 L/100 km ... 61.6 mpg (Imp)


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    Senior Member Rkt Ship's Avatar
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    Well now the time to ask. Are there any differences between the 2014 auto vs manual ecu and 2014 to 2017

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    Senior Member MightyMirageMpg's Avatar
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    Smile

    Rkt ide definitely hold off on shelling coin for an ECU before you do some more testing

    Does anyone know if you can just swap ECU's without having any calibrations or anything done?

    If you need someone to double check some funny readings or whatever post what you need done and I'm sure someone will help. Unfortunately someone stole my good meter (its like a war zone in milwaukee) and i don't trust the harbor freight jobby around my ECM. Lol

    Does the car start and run on 2cyl? There's a few things you should look at like the commanded timing value and the 02 sensor bank 1 voltage.

    A stuck shut EXHAUST valve will still allow you to read good compression but obviously the engine would appear to be missing, even though it's actually not. Your 02 wouldn't read lean or rich because it's reading the working 2 cylinders.

    I would also (as foama and eggman suggested) pay particular attention too the wiring connections.

    Where did you have your negative test lead when you were reading the 2.5vdc? The battery or just a random ground?

    The HERTZ test will obviously rule definitively if the ECM is firing the injector but not necessarily WHY it's not firing it. I do believe that the hertz test is polarity sensitive, also.

    Maybe a local could meet up and just swap ecu real quick. Ide hate to see you waste $

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    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by MightyMirageMpg View Post
    Does anyone know if you can just swap ECU's without having any calibrations or anything done?
    I don't know. That's what I was wondering about. I see them on eBay for anywhere from $50-$150. A new one is $700+

    The part numbers for manual trans and CVT ECMs are different.
    The 2017 ECM also has different part numbers than 2014-2015s.

    2014-2015 Mirage ECM
    Manual...1860C141
    CVT......1860C142

    2017 Mirage ECM
    Manual...1860C644
    CVT......1860C645

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 51.3 mpg (US) ... 21.8 km/L ... 4.6 L/100 km ... 61.6 mpg (Imp)


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    Moderator Eggman's Avatar
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    1. I'm pretty sure a new ECU will require programming (think VIN & odometer.)
    2. I'm somewhat nearby and will offer any assistance needed.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 49.7 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.7 mpg (Imp)


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    Quote Originally Posted by Rkt Ship View Post
    Well now the time to ask. Are there any differences between the 2014 auto vs manual ecu and 2014 to 2017
    I'm curious about this as well. If they're easy to change I might be able to tell you if a 17' will work in a 15'. And if 15 will work in a different 15' without programming. Where is the ecu, I haven't bothered to look yet? I have a running 15' car I'm bringing inside soon and 2 crashed 15's and a 17' I can swap parts with.

    EDIT: I just read topfuel's post. I don't want to mess up a 17' computer so I'll just see if you can use the same year without programming. The vin would probably be stored in the computer and should be programmed but who knows maybe it would still start?

  13. #30
    Senior Member Rkt Ship's Avatar
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    Quote Originally Posted by Top_Fuel View Post
    I don't know. That's what I was wondering about. I see them on eBay for anywhere from $50-$150. A new one is $700+

    The part numbers for manual trans and CVT ECMs are different.
    The 2017 ECM also has different part numbers than 2014-2015s.

    2014-2015 Mirage ECM
    Manual...1860C141
    CVT......1860C142

    2017 Mirage ECM
    Manual...1860C644
    CVT......1860C645
    The yard I got the other parts from has 3 mirages but I havent seen if they have any manuals trans ones. Considering they are less common I would probably say no. Thery sell them for 125 and I can go pick it up.



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