Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Engine Knock on start-up? Why? › Reply To: Engine Knock on start-up? Why? December 28, 2021 at 3:06 am #993239 Lou MerrellParticipant I know that on my 2003 Chevy tracker (2.0 Suzuki interference engine) that a rattle on start-up may indicate a failing timing chain hydraulic tensioner. Not sure if this is the engine in your Rav 4 though.