Toyota Highlander and Rav4 Engine Cold Start Timing Rattle Problem and Fix
Does your Toyota have a VVT-i (Variable Valve Timing with Intelligence) engine that has developed a noticeable rattle whenever you start the engine? If so, then you will want to know what is going on and why in some cases you can wait a while before repairs whereas in other cases repairs have to be done right away for this common Toyota problem.
Source: torquenews.com