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Thread: 100,000 mile compression test/spark plug replacement!

  1. #31
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    Quote Originally Posted by Fummins View Post
    I've never indexed spark plugs except for in diesels.
    I find that very interesting!



  2. #32
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    Note to self: Remove the antenna...

    My Cummins is always fouling spark plugs so I have to change them freqently.

        __________________________________________

        click to view fuel log View my fuel log 2020 Mirage ES 1.2 manual: 42.6 mpg (US) ... 18.1 km/L ... 5.5 L/100 km ... 51.2 mpg (Imp)


  3. #33
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    Quote Originally Posted by 7milesout View Post
    No, I haven't done it to the Mirage yet. I figure out how much rotation it takes to bend the metal gasket thingie to reach set torque. And if it's out of position when I meet the metal gasket thingie before bending it, I swap it to the next cylinder. It will be more difficult to do it right on a Mirage since we only have 3 cylinders. In the end, it's not worth it. But I can't help being a friggin nerd about it.
    I think a person would need a set of washers with different thicknesses to pull it off. They would act as shims, but then you may have the risk of not having your spark plug seated down far enough (creating a whole new problem).

    Fummins - So rockauto.com list factory OEM NGK spark plugs for $6.16/plug, but you can only buy them in pack of 4 for that price. You can't change your checkout cart to 3 plugs. I find that a bit stupid, but that doesn't bring up my questions here.

    As I look at the plugs in the checkout cart (wanted to see what shipping would have been), this notice comes up -

    "Manufacturers recommend replacing Spark Plug / Coil-On-Plug Boots when replacing Spark Plugs."

    Spark plug boots for a Mirage are $3.57/boot @ rockauto.com.

    Have you or anyone seen this manufacturer suggestion?

    Have you or anyone had an issue their coil-on-plug boots?

    Seems like a notice I would ignore, but wonder if this has been an issue for anyone? I don't see myself doing my first plug change for another 4 years or so.
    Last edited by Mark; 05-17-2021 at 08:48 PM.

  4. #34
    Ethay earthway isway atfl Fummins's Avatar
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    That's dumb. We sell individual spark plugs at work.

    I've only replaced plug boots if they're cracked,torn or soaked in oil. I've never had to replace any on the Mirages yet. But...one of the shops that services our cars out of town claimed a Mirage needed spark plug boots. So I sent them a set from an engine I had on the floor and asked for the old ones back. I didn't see anything wrong with them at all. No cracks, not dried out. Just a waste of time and money I guess.

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


  5. #35
    Ethay earthway isway atfl Fummins's Avatar
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    Quote Originally Posted by 7milesout View Post
    Note to self: Remove the antenna...

    My Cummins is always fouling spark plugs so I have to change them freqently.
    Glow plugs too, they're always plugged with blinker fluid.

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


  6. #36
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    I had a set of spark plug boots crack immediately upon changing spark plugs on a 1990 Toyota Celica. I didn't know what the problem was, as the boots seemed fine during the spark plug change. Took it to a shop, they told me the boots were arcing to the head / valve cover. Luckily, they didn't charge me just to find the problem. I took it home and put 4 new spark plug wires / boots on it and back to running like a champ. Course ... it did have probably close to 200k miles on it at that time. Not a drop of oil down in there. It just stayed dry and cycled from ambient to hot for 200k miles. Guess it dried out the boots and made them brittle.

    I can see why a manufacturer might recommend such a thing. But I think it could just be monitored and replaced as needed.


        __________________________________________

        click to view fuel log View my fuel log 2020 Mirage ES 1.2 manual: 42.6 mpg (US) ... 18.1 km/L ... 5.5 L/100 km ... 51.2 mpg (Imp)


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