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tikamak, I have exactly the same symptom on my car. Now and then, at idle, a few knocks (like 3-4). The series of knocks are rather seldom, being separated by quite a few seconds.
I also wonder where they come from, as the engine runs fine.
It's not connected to the valve lash, since I am checking/adjusting them once a year.
If you have any more feedback since you opened this thread, please post it here.
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