1999 Toyota Sienna Timing Belt ?

A 1999 US Toyota Sienna has a timing belt. According to Toyota, the timing belt should be replaced at every 90,000 miles or 6 years, whichever occurs first. (Since it is over 9 years old now, if the timing belt hasn't been changed it is long overdue now!)

http://www.toyota.com/help/faq-service.html (See the questions "Does my vehicle have a timing belt or a timing chain?" and "What maintenance is required on my timing belt?")

It would also be listed in the 1999 Toyota Sienna's scheduled maintenance guide. If you friend has misplaced their copy, you can view it online at: http://smg.toyotapartsandservice.com/

Depends largely on the model of the engine, but most Toyotas suggest 90,000 miles. Also, while changing the belt, you should replace the water pump, idler pulley, cam seals, and anything else that is under the timing cover. This way it saves you the hassles (and expense) of having to go back into it. The mechanic will usually not charge you anymore labor to do that, just the parts. Good luck!

If it seems to skip, or it is lagging, and setting codes (check engine light) and the ignition system is good, look at the timing cover. Does it have any trace of blue around the seam where it bolts onto the block? If you see any blue or orange silicone, chances are it has been replaced. Look at the condition of the area around the timing cover - is it cleaner than the rest of the motor? These are the only ways to tell if it has been looked at or changed, but you can't really tell unless you remove the timing chain cover completely. If you have taken it to one mechanic and they said it was the timing chain, take it to another - but don't tell them you have already taken it to a shop and they said you needed a timing chain. Wait until they look at it and tell you what they think, then casually mention that another shop had told you the timing chain needed replacing. Meter their reaction and go from there.

The service manager at our local Toyota agency told me the company does not make an engine that ruins itself when the belt breaks, so it's safe to just wait for that, rather than replacing on a schedule.

Might save a little dough that way. Of course when it does break you will need a tow, so join AAA.

check your owners Manuel it will be in tell you in there based off Manufactures recommendations