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Thanks, I did clean those tiny ports very carefully with a long brush.
I would love to understand how a clogged EGR cooler can overtime damage the head gasket.
I bought the car when it was at 245K miles, 7 months ago. I did those a week ago. The noise I heard was not loud, I think it was always there...
Coolant level is normal. Did a block test at the coolant tank, result negative. Engine does not rattle in the morning indicating the coolant is...
I have a gen 3 Prius 2011(250K miles). It violently rattles in the morning. Changed spark plugs. That fixed it. Continue to remove and clean...
