Note to self: Remove the antenna...
My Cummins is always fouling spark plugs so I have to change them freqently.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)
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.
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.
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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)
mohammad (07-22-2022)
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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)
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.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)
Bought a 2015 ES automatic at auction on Tuesday, had 105,000 miles, spark plugs looked the same as pictured, so I assume that they had never been changed. Did compression test
1. 155psi
2. 150psi
3. 160psi
Not close to your 190s but minimum according to mitsubishi is 138psi so I guess I can't be too sad.
According to carfax service history was regular. I started this because I drove the car today delivering pizza and only got 27mpg and all my other mirages get 40+, so I suspected a spark plug or compression problem, not sure if new plugs will help but we will see.
Adding some data on these cars. 2015 DE with cvt transmissions 172,000 miles on odometer. #1 182 psi #2 179 psi #3 185 psi. Regular oils changes per manufacturer (with some extended runs due to laziness).
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View my fuel log 2015 Mirage DE 1.2 automatic: 46.2 mpg (US) ... 19.6 km/L ... 5.1 L/100 km ... 55.5 mpg (Imp)
Cobrajet (08-21-2022),davidricardo86 (04-14-2023),inuvik (08-22-2022),Wil B (08-20-2022)