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I was really suspicious of one tank of gas I had purchased, and refilled elsewhere, which made a huge improvement.
Again, I seem to hear this under load, and especially when the weather is colder. It is my understanding that there are 'knock sensors' on modern engines that retard the timing when they perceive knock, and perhaps some of that is happening.
It is not an everyday occurrence, and, yes, perhaps what I'm calling 'valve clatter' is indeed pinging or knocking.
I'll have a listen standing next to the car as well. I'm planning on keeping this one for a long time (I'm not crazy about the new model).
Thanks, and happy for any other thoughts,
Moon
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