How to adjust idle on 2004 corolla - 2004 Toyota Corolla

most likely idle air control valve on throttle body remove rubber air duct that runs from air filter spray real good with carb spray wait 30 minutes for it to dry should improve condition

you can adjust the idle air right at the air intake

are you allowing the car to warm up first before checking your adjustment screws? have you also checked the timing of your vehicle?

Check for missing/ broken vacuum hose. Remove vacuum hose for brake booster and plug That checks for air leaks in booster. Check for power to the idle solenoid unit .If that is not working the idle circuit of the carby is shut down. Adjust idle mixture screw as well.

THE COROLLA 2006 NO IAC ADJUST THE ECU I HAVE THIS PROBLEM TOO AFTER REPLACED THE BATTERY

P0505 is correct, but replacing the IAC won't help if the PCM cannot control and/or monitor the operation

you need to measure voltage at the IAC and/or the signal return to the PCM

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

adjust the accelerator cable.

Carbureted models have a fast idle cam on the throttle,It is a screw that sets against a movable part,called the cam,when the engine heats up,the cam will drop upon tapping the gas pedal.Set the carb,while the engine is cold,by tapping the gas pedal,then adjust the fast idle cam screw by turning it in,with the engine running.Start out by turning the screw in a full turn before starting engine so it will run,then adjust the screw as the engine runs.

If you dont have any trouble codes, this usually occurs when the idle air control valve (IAC) is going bad.