Does anyone know what is the cause? The sound is like valve train noise (lifter,valve,valve spring).No one has identified where the noise is coming from?
Just purchased a certified 2007 RX 350
In the morning on a cold start there is a distinct engine knock. It diminishes as the engine warms up but never fully goes away.
I have had the vehicle to Lexus service. They tell me this is normal (The nature of the beast). Does anyone have a fix or a service bulletin that addresses this problem.