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Just my 2c worth.
I had a problem like this years ago with a 2.4 motor. One cylinder was always fouling the plug, smoked a bit and finally started losing compression. I had just purchased the car and did not know much of the past history.
Could not figure out the problem and finally gave up and found a 2.2 motor to swap in its place. Once I had the time to start tearing the old motor down I found that (the car had been sitting for a while) a mouse had made a nest inside the motor on top of the left hand forward cylinder between the shroud and cyl head/cylinder. It had crawled inside the shroud by going into the fan inlet then to the back.
The cylinder, piston and rings had been baking for months because of lack of cooling air while I drove it thinking that all was OK.
Any chance you may have the same thing? Or a plugged up fuel injector in that cylinder making it run lean and thus hot?
Just passing my past history... never would have guessed this one.
JoeA
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