I have a 2002 Toyota Avalon that I purchased new that now has 295000 miles and has developed a fast idle condition at start up that idles between 1500 and 2000 rpm. It will not return to normal idle until 5 to 10 minutes and sometimes idles at 700 rpm and other times at 1100 rpm. I have changed the IAC Valve, Temp sensor, VSV Valve and Throttle Position Sensor with no change to the fast idle problem. What could be wrong?
If you have not run the fault codes then that would be a good place to start. It will save you money as it will pinpoint the failing sensor.
Testimonial: "No fault codes set."
SOURCE: i have a 1996 tacoma, have had a problem with a
Tap on the mass air flow,and see if it changes idle,if it does,it is the problem,If the throttle position has to be tapped on,then it could be defective,change it out for a new one.
SOURCE: 1993 toyota 4x4 idle problem
sounds like your throttle positioning sensor is not set right so i would undo the two phillips heads that hold it and turn it till the idle doesnt fluctuate should be turned most of the way to the front of the truck. Also check your idle screw that throttle body could be set different.
SOURCE: Loping and high idle
You are really onto it! Either the TPS or the cable from the peddle. Do check the cable first. Frankster016
SOURCE: I have a toyota camry 1997, 4cyl. When I'm driving
could be the coil pack playing up ,or the computer not working properly ,very difficult to diagnose without the right software so i would suggest taking it to a dealer and see what they say
Typical poor IAC control is cold stalling or slow idle speed response to changes in electrical load, The IAC is check by monitoring Idle RPM,when you turn on the head lamp and press brake pedal,The IAC responds for electrical load, You say you cange the ECM,it has to match if you are protocal CAN,without a reflash the behavior of the transmission is compromised, Whenever a transmission component or transmission change is performed the ECM must have its learned value performed,Yes the ECM could of been the solution,as for removing the ABS relay your vehicle has a zero point calibration.Flash the ECM
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