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Well I chose not to buy a toyota sienna after reading about denied warranty claims despite proof of maintenance. You expect that sort of treatment from the lower tier manufacturers.
It pings hard when fully warmed under hard accelleration. When it starts to come on strong around 4k. I suspect the knock sensors are corroded and causing the problem. It could also be weak fuel pressure, o2 sensors, poor egr flow, or carbon buildup. All likely contributers. Currently it runs very well so I'll leave it as is. It doesn't always do it.
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