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Yep, still under warranty thank goodness! I looked into this issue even deeper today and on each VVTi controller (1 on each cam) there is a lock pin. When the engine is stopped, oil pressure will drop which will lock the intake cam to the most retarded angle via lock pin and lock the exhaust cam to the most advanced angle for best startability. I'm guessing one of the lock pins may not fully engage during shut down like it should. Partial engagement would probably allow the pin to contact the rotating housing until oil pressure is built up enough to fully disengage the lock pin. I think the pin is either getting stuck or the return spring is out of spec.
I'm guessing you're right. It seems as though Lexus designed this engine a little more complex than necessary. Please keep us up to date; I'd be interested in knowing the final outcome.
