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Thread: 3A90 Intake valves stuck open, carbonized, full of gunk and car won't start

  1. #71
    Moderator Eggman's Avatar
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    Hey foama would you please describe how you captured those images of your valves? I would like to try this.


        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 49.0 mpg (US) ... 20.8 km/L ... 4.8 L/100 km ... 58.8 mpg (Imp)


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  3. #72
    Senior Member HitShane's Avatar
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    Quote Originally Posted by Eggman View Post
    Hey foama would you please describe how you captured those images of your valves? I would like to try this.
    Quote Originally Posted by foama View Post
    Yes, took the pix today with a USB endoscope. They're sold by Weepay and other sites for around 10-15 bucks.

    Taking those pictures was easy. I just took the block with the three injectors out (two bolts), and stuck the endoscope through each injector hole for looking at the valves, and took pictures. Afterwards thoroughly cleaned and lightly lubed the O-rings and put all back together. Real easy to do, took no more than 10 mins.
    Like this.

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  5. #73
    Member chris_top_her's Avatar
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    Quote Originally Posted by Eggman View Post
    Hey foama would you please describe how you captured those images of your valves? I would like to try this.
    Something like this if you have a android phone http://www.ebay.com/itm/5-5mm-Androi...Za4AGsJicVnm8Q
    they also have them for iPhone and some with wifi to connect to the phone. Or a usb type for laptop.

  6. #74
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    I got a couple of questions for everyone. First off, how quick are these cars and will driving them faster cause this issue? I rarely if ever even do over 80mph (128.75 kph). Usually I am between 65mph and 75mph on the interstate. Also, I am currently only using unleaded fuel over here in the states. Since this is a high compression engine (I have the 1.2 i3) should I be using only premium grade fuel? My car seems to run just fine on regular unleaded but I don't want to take any chances of something like this happening to mine. My thoughts however on why this issue happened (like so many others on this post) would be that the fuel had to have something to do with it. Perhaps we use more detergents in our gasoline here in NA? So maybe lack of detergents caused the quick carbon buildup on the valves?

  7. #75
    Moderator inuvik's Avatar
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    It's the lack of a EGR in the 3A90 1.0 that is a contributing factor for the carbonization along with most likely some bad fuel. This has been a non-issue with the 3A92 1.2. No need for premium, regular grade fuels are just fine. Many members report they drive their Mirages pretty hard all the time with no issues. Just keep driving like you always have been. As far as how fast will a Mirage go? A few members drive 80+ all the time and yes triple digit speeds are possible.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 40.7 mpg (US) ... 17.3 km/L ... 5.8 L/100 km ... 48.9 mpg (Imp)


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  9. #76
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    I'm with inuvik, putting premium in a mirage is a waste of money. They run fine here on 87 octane.

  10. #77
    Administrator MetroMPG's Avatar
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    Quote Originally Posted by Dabullfrog91 View Post
    I got a couple of questions for everyone. First off, how quick are these cars
    Not "quick", relative to most cars in the US.

    Thread: Mirage acceleration times: 0-62 mph / 0-100 km/h and top speed (1.0L & 1.2L engines)




        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage base ES 1.2 manual: 54.0 mpg (US) ... 23.0 km/L ... 4.4 L/100 km ... 64.9 mpg (Imp)


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