Why is my 99 Camry is idling higher than normal?

SOURCE: my 1987 turbo toyota supra

The throttle position sensor has an idle switch in it that tells the car's computer that the throttle is positioned at idle. If the idle switch sticks in the idle position, the computer will not allow the engine to rev more than 2500 rpm. In your case, I think the switch is stuck.

First, see if you can get the trouble codes to come up. Rig a jumper wire and jump between the "T" terminal and the "E1" terminal in the car's "Diagnostics" box. It is a small black box on the driver's side of the engine compartment near the battery. Open the lid and on the inside of the lid it has a map of the terminals.

Once you hook up the jumper wire, turn the ignition switch to on but do not start the car. If there are codes, the check engine light (orange) will blink the 2 digit code. It blinks the first digit, pauses, then blinks the second digit. The code for the throttle position sensor is code "41". That is, four blinks...pause...then one blink. If this code comes up, change the throttle position sensor. (If there are no codes, the check engine light will steadily blink once per second until you turn the key to off.) Don't forget to remove the jumper wire when you are finished.

SOURCE: engine doen't stay idle at steady rpms rev up and down by itself

Either you have a vacuum leak, a bad throttle body position sensor, or a bad throttle body.

If the throttle body is drive by wire (electronic) then it would be a bad throttle body.

If the throttle body is drive by cable (manually driven by a cable connected to the gas peddle) then it would be a bad throttle position sensor.

If the throttle body is bad the check engine light wil lbe on. If it is on have your codes read at your local parts dealer for free, and this will give you a clue as to which pices/parts you need to replace.

Have the car leak tested and the vacuum linse inspected for leaks as well.

SOURCE: Engine rpms drop very low when AC is on

make sure your engine idle speed correct.air conditioner compressor will take power from engine.the engine has to be fine tune.your engine idle to low have the idle speed control checked.

SOURCE: Replaced the battery in 2002 camry now it won't idle

When you replace battery in 2002 Camry ECM tries to reset to factory levels. The reason it will not idle is that the throttle body is dirty and ECM thinks it should be new!! Clean throttle body with cleaner that is safe for tbs and this will fix your idle problem.

SOURCE: 1990 Toyota Camry LE with the 3S-FE idle problem

the engine management system is trying to find correct idle speed/no fuel (when you take your foot of the gas above 850 rpm no fuel goes into the engine.help economy/egr system to burn off.try using a higher/lowe octane fuel to see if any change occurs.also try a gas treatment like unwins/redexe

Testimonial: "Hi I tried your suggestion on gas treatment and it seems to be working.I noticed in the actual owners manual it says to use 91 or higher octane gas."