My van accelerates from a stop anytime you take your foot off the brake. I was told by the dealer that this is normal. Compared to other vehicles I have driven it is not normal. On level ground it will accelerate to 10 mph in a few seconds.
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2002 Toyota Sienna Question: accelerates from idle
Answer #1Superbob April 18, 2011, 11:45Master
There is some acceleration expected when you take your foot off the brake with an auto trans car. If your idle is too high, then it will accelerate too much because of that. Your idle should be around 750 RPM in neutral and a maybe little less in gear. It should be a little higher if the A/C or defroster is on.
If the idle is too high, there could be a problem with the Idle Air Control (IAC) valve near or on the throttle body, or possibly the gas pedal or throttle cable is sticking. Sometimes the IAC gets stuck or fouled with carbon and needs cleaning. Check the idle speed and if you think it's a problem, find a Toyota specialist to help you.
If you want to find a specialist, here's a directory link for you: