One problem related to loud engine noise has been reported for the 1998 Toyota RAV4.
: the contact stated while driving on the highway at 70 mph, there was a very loud noise that sounded like an explosion. The vehicle stalled suddenly without warning. Upon inspecting the vehicle, there was oil all over the engine. The vehicle was towed to a local repair shop who determined the engine had failed due to oil sludge. Updated 10/25/2006 -.