Consider a possible fault in the ECU, the computer. It can't be repaired internally, and really the only way to be sure is to trial a replacement. It has to be from the same model, trans and engine. If you can find a wrecker who will allow you to try one out, the swap is easy enough, behind the glove compartment. See here p 234
http://www.turboninjas.com/camry/eg1.pdf
SOURCE: need to locate toyota aurion/camry iac valve
the MAF sensor is between the air filter and throttle body. the idle controll is at the throttle body.
Its located on the throttle body on the left side. Follow the air intake to an intake manifold which sits on top of the throttle body.
SOURCE: 2000 Camry Starts but dies down right away
Hello
I just worked on this problem a couple of days ago. If the motor is a 3.0 liter. The idle control valve is located at the bottom of the throttlebody assembly right below the bore for the throttle butterflies..What usually causes this valve to go bad is the mechanical part of the sensor sticks as it becomes sludged or carboned up. Manufacturer claims that the valve cannot be cleaned and should only be replaced....It's a high dollar repair to replace this sensor as your engine coolant flows through this electrical valve. The valve idles the car fast when cold, as the antifreeze gets hot the valve drops the idle down.....I have successfully cleaned several of these valves and cured the dying problems...
First remove the air filter top cover and the tubes that connect to the throttlebody. In the right throttlebody you will see a port right before the butterfly. Under the throttlebody you have a black plastic sensor with a 2 wire terminal. Remove the 2 phillps screws and pull off the electrical part of the valve. you will feel a magnetic pull while removing. Remove slowly and catch the black sealing oring, and there will be a metal washer also.. The shaft that is exposed is the mechanical control of the valve. Rotate the shaft and it should feel sticky if bad..Using a throttlebody spray cleaner spray into the small square port of the right bore, rotate shaft and spray until stickfree.....Reassemble
SOURCE: 2002 camry le 4 cyl idles really really low,
This vehicle is equipped with an electronic throttle control motot that operates the throttle plate. and controls the idle if your throttle plate is carboned up if will decrease air flow into the engine causing a low idle. This is very common if your battery was replaced or disconnected.
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.
SOURCE: 1998 camry 5sfe engine, surging at idle
Check for air leaks in the vacuum pipes in and around the inlet manifold, they have a habit if going brittle and splitting.
Another possibility is the temp sender , if the ecu thinks the engine is too cold it will compensate causing the engine to " hunt". This can be something as simple as a worn radiator cap seal letting air into the cooling system and tricking the sensor.
Hope this helps, Marshall
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Hi joe_duey, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Have you checked valve timing?
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