# Unwanted Acceleration on 2000 Astro Van **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** astro, chevrolet, acceleration\ **Created:** [June 10, 2010, 9:40pm UTC](https://community.cartalk.com/t/unwanted-acceleration-on-2000-astro-van/50149 "2010-06-10T21:40:41Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![dhammond29](https://avatars.discourse-cdn.com/v4/letter/d/8edcca/32.png) [@dhammond29](https://community.cartalk.com/u/dhammond29)\ **Post date:** [June 10, 2010, 9:40pm UTC](https://community.cartalk.com/t/unwanted-acceleration-on-2000-astro-van/50149/1 "2010-06-10T21:40:41Z")
I’ve taken my 2000 Astro Van to two different mechanics to try to fix the unwanted acceleration problem it’s having. They have both said there is no problem, and have cleaned something – the throttle or some part of the3 carbeurator, I’m not sure. At times (not always) the van will maintain a 35 mph speed on a flat road without any accelerator pedal action. It can also climb slight inclines. The danger comes when I am going down a mountain–the cruise control doesn’t help at all. It accelerates while I am trying to brake. Not good. Please help! Thanks in advance. ---
**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\ **Post date:** [June 10, 2010, 10:20pm UTC](https://community.cartalk.com/t/unwanted-acceleration-on-2000-astro-van/50149/2 "2010-06-10T22:20:30Z")
If they cleaned the carburetor, then demand your money back. You Van doesn’t have one. I would guess an IAC problem, but they should have tried that first. ---
**Author:** ![dhammond29](https://avatars.discourse-cdn.com/v4/letter/d/8edcca/32.png) [@dhammond29](https://community.cartalk.com/u/dhammond29)\ **Post date:** [June 10, 2010, 10:28pm UTC](https://community.cartalk.com/t/unwanted-acceleration-on-2000-astro-van/50149/3 "2010-06-10T22:28:52Z")
Thank you so much! What’s an IAC? ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [June 10, 2010, 11:05pm UTC](https://community.cartalk.com/t/unwanted-acceleration-on-2000-astro-van/50149/4 "2010-06-10T23:05:16Z")
The Idle Air Control circuit. It basically is an ECU driven motor that controls your idle speed. I found a link that might help > **[How Idle Air Control Valves Work Explained in Under 5 Minutes](https://www.2carpros.com/articles/how-a-idle-air-control-valve-works)** > > Repair guides, articles and advice for car owners, enthusiasts and repair technicians.