check the battery
Broken rotor button.
There could be several reasons why a Toyota Sienna will not start. the most common problem would be a dead battery.
moisture on the ignition coils.spray them with silicon spray.
Low battery, bad connection or starter.
click the start tab>run>type MMC and then click ok.
battery is low or almost dead
Check fuses
- Click Start button and go to "My Computer". - On the menu bar, click "Help" and then click "Help and Support Center".
PowerPoint
Could be the rocker arms in the engine, change your oil and if you ever get into the engine check those little SOBs out. ;)
Probably not, although it could lead to other problems which would cause your car not to start.
The sienna is a more stylish car that from most people would say the sienna overall is a better van and i would go with that, but the grand caravan is a less-expensive van that is still ( but not as good as the sienna as i said ) a very good van, i would say go with the sienna if you're buying a van but if it is not in the budget go with a caravan as a second choice.