One problem related to ignition has been reported for the 1998 Toyota Sienna. The most recently reported issues are listed below.
The contact owns a 1998 Toyota Sienna. While attempting to start the vehicle, it suddenly accelerated and the engine continued running. The vehicle was taken to an authorized dealership where the contact was informed that the failure could not be duplicated. The current and failure mileages were approximately 100,000. The consumer stated when the vehicle was first started after sitting overnight, the engine would rev high even though the gear was in park. The consumer stated he then removed the key from the ignition. However, the vehicle would continue running. Updated 06/22/10.