Question about 2001 Toyota Sienna
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Posted on Jan 02, 2017
Check and clean Idle air control valve. Make sure its responding to signal as well. Also make sure ther are no vacuum hoses disconnected. This may not be a "cure" but it's a good place to start.
Posted on Apr 14, 2009
SOURCE: 2003 toyota sienna idle problem
After about 100K + miles the idle air control valve (IAC) begins to collect carbon deposits that interfere with the movement of the spring-loaded valve. You will not be able to clean this without removal and dissembly of the IAC body. Use an emory cloth or fine sandpaper to remove the build up around the valve. This should free it up to rotate without binding. This is a temporary fix, of course, and will either require cleaning again or replacement of the valve. Getting to the IAC requires removal of most of the intake upto, but not including, the intake manifold. Total time is approximately 3-4 hours, but worth it. Good luck, and I hope this helps.
Posted on Feb 21, 2010
The second cable should be for cruise control. Your problem sounds like either a vacuum leak (air entering the engine unmeasured by the air sensor), or fuel vapor in the fuel rail. A vacuum leak can be determined by spraying starting fluid at the air intake hoses, plenum,and connections while the engine is idyling and noting where the engine accelerates to determine where the vacuum is leaking (unmetered air is entering) from. Tighten or replace gasket,hose,seals etc. Bleed the air on the fuel rail if needed with care.
Posted on Aug 11, 2010
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