One problem related to loud engine noise has been reported for the 2008 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota Sienna based on all problems reported for the 2008 Sienna.
Car completely stoped without any warning on an extremly busy road. Extremely loud noises are coming from the engine and car will no longer move. Still cluessless on the issue at hand.