Rx 350 Cold Start Engine Knock

[DWD1010]

I 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.

[rx350guy]

I 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.

There is a lot of discussion about this issue on the board, and I believe the general consensus is that it is normal for the RX's.

[Messerchmidt]

yupp, very normal

[scottq60]

yupp, very normal

My wife's '09 has done it since new and even the '10 loaner they gave her while hers was in for a recall...did the same thing.

While they say it's "normal"...you still wouldn't expect it from a $45k+ vehicle. Otherwise, it's been the most trouble-free vehicle we've ever owned. We love it.