I have a 98 series 100, when it is cold 30 or less the lifter make a loud noise when the engine is started. This noise goes away after 20 to 120 seconds. I'm told this is normal by the Toyota service department. Does anyone else have this happen. The colder it is the longer I hear the noise. I read on another thread about throttle failure. I had my throttle sensor replace at 60k. I was almost hit at an intersection when mine failed. You have a great forum here, glad I found it.