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Expert: sprinkles08 replied 4 years ago. Hello and welcome to JustAnswer! Yes, the 3.3 and 3.8 are interference engines. They have a timing chain instead of a timing belt though, I've never seen or heard of a timing chain breaking on a 3.3/3.8 and causing any valve damage.sprinkles08, Chrysler/Dodge/Jeep master tech.Category: Dodge.xpert: sprinkles08 replied 4 years ago. Hello and welcome to JustAnswer! Yes, the 3.3 and 3.8 are interference engines. They have a timing chain instead of a timing belt though, I've never seen or heard of a timing chain breaking on a 3.3/3.8 and causing any valve damage.
2004 switched to the 3MZ-FE. Based on this forum post:http://www.siennachat.com/forum/185-problems-maintenance-rep...it sounds like the 2004 2nd gen definitely has an interference engine with the 3MZ-FE.The 1MZ-FE seems interesting, lots of discussion and maybe even misinformation.'m looking at a used 2002 Toyota Sienna LE. It's got 149K miles on it, and as far as the owner can remember, he's never replaced the timing belt.Does the 2002 Toyota Sienna LE have a non-interference engine?I searched and searched trying to find some definitive answer to this question, but I can't.