Question about 2004 Toyota Corolla
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Posted on Jan 02, 2017
seems like the engine isn't timed right, either the timing marks aren't lined up or if there is a distributor it isn't in time with the crank and cam
Posted on Oct 07, 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
Idle is factory set and cannot be adjusted, your best bet is checking for cracked hose pipework for air intake at idle,(not at problem under exceleration and driving) Any slight upset to the air /fuel ratio will be most prevelent at idle speeds.Check hoses where the meet metal flanges on manifold intakes and any sharp bends in ppipes.Good luck
Posted on Apr 05, 2010
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