How do you decrease the idle from 2000 RPMs?

Answer 1

Idle of 2000 rpms might be some kind of problem. Do you have any warning light on the dashboard? have the car been scaned?

1) Well, when the ignition module (Engine Control Module), detects a malfunction, due to some loss of signal, or sensor related problem, injectors, etc., there is a safe-function to have the engine working beyond optimal control; that is, minimum or default conditions for operation. In other words, engine idle-up = engine control failure.

2) When the A/C system button is ON, and the Compressor is working due to interior room temperature conditions, along with both fan coolers (radiatior and condenser), the ISCV (Idle system control valve or stepper motor) it is also commanded by the ECM to increase the rpm up to near 950. However that is not your case.

3) Other systems, like steering wheel operation, electrical consuming, like lights and so on, have the ECM to increase idle rpm.

4) Some important function that has the engine rpm decrease is the temperature control, done by the ECM. The temperature sensor, a unit gauge located in the thermostat housing, informs the ECM about the engine temperature. Once it warms up, after cold starting, ECM commands the Idle control Stepper Motor to decrease rpm to normal value, which is around 700 +/- 50, if no service is ON, and around 950 if A/C is on. If this sensor fails to inform such changes in temperature, then ECM might never commad the rpm decreasing.

5) the Idle control stepper Motor itself, which is responsible for proper idle rpm, may be the problem. The proper inspection of such part must be done. It works with 6-wired coils for the stepper motor, using around 6 volts. It is easy to be taken out and been inspected to assure free moving of the acting part as a valve. Check also the tightness of the 6-wired connection.

6) Finally, if everything goes just fine, there are two screws to check, having the stepper motor disconnected:

_ there is a screw covered by a rubber cap controlling a mechanical valve to let free air-by-pass for minimum idle rpm, as of no Stepper motor working, which is located top of the throttle body.

_ and a factory-adjusted screw that works as a stopping for the throttle mechanism when you release the pedal. It is located botton of the Throttle body; the more it is turned clock-wise, the more will be idle rpm with no acting of the stepper motor.

Hope this helps.