Correct adjustment for idle air control sensor

This cable cannot be adjusted. If it is loose on the throttle body, the gas pedal may not be returning to the correct position when pressure on the pedal is released. Idle is completely controlled by the engine computer based on settings from various sensors, and will have a problem if the throttle body internals or the idle air control (IAC) pintle is fouled, or if this control is not performing correctly.

The idle air control valve is designed to adjust for the load on the engine to maintain the idle quality. When it's cold out, it's more important that the engine temperature sensor is working correctly so that it can trim the fuel richer to compensate for the cold running conditions. Also, a dirty Mass Air Flow sensor could give you problems with your idle. A shop could easily diagnose the poor idle quality for a reasonable fee if you don't feel like throwing parts at it again. Have you experienced unusually poor fuel economy or better than normal fuel economy this winter?

An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The cars computer or ECM (electronic control module) receives information from various sensors and will output signals to adjust the IAC motor in or out to adjust engine idle speed by controlling engine idle air. ----------------------------------------------------------------------------------------
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I would check the IAC motor or idle air control motor, heres a little info.about the part.Stratus Sedan, 1999-2005 Idle Air Control Motor

• DESCRIPTION & OPERATION
• REMOVAL & INSTALLATION

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Description & Operation

Not for Dodge Stratus Sedan
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

Fig.

Not for Dodge Stratus Sedan
When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

Fig.

When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
Target Idle
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor

Removal & Installation

1. Disconnect the negative battery cable.
2. Disconnect the IAC electrical connector.
3. Remove the IAC mounting screws.
4. Remove the IAC.

To Install:

1. Install the IAC to the throttle body.
2. Tighten mounting screws to 5.1 Nm (45 inch lbs.) torque.
3. Attach electrical connector to the IAC.
4. Connect the negative battery cable.
   
   

   Fig.
   

1. Disconnect the negative battery cable.
2. Disconnect the IAC electrical connector.
3. Remove the IAC mounting screws.
4. Remove the IAC.

To Install:

1. Install the IAC to the throttle body.
2. Tighten mounting screws to 5.1 Nm (45 inch lbs.) torque.
3. Attach electrical connector to the IAC.
4. Connect the negative battery cable.

There is no idle adjustment on a 1996 Buick LeSabre. The idle speed is computer-controlled. Incorrect idle speed can be caused by many things including a faulty Idle AIr Control (IAC) motor, vacuum leaks, or malfunctioning sensor inputs or circuits such as the Throttle Position Sensor (TPS). If it is not idling correctly, the engine control system must be properly diagnosed to find out the reason why.

air idle control valve, I dont belive you have a ideler set screw..I do belive the problem is what I have Listed..........Best of luck


How can I tell if I need a new air idle control valve?
If your car has a rough idle or the idle cycles up and down, then chances are that you have a bad idle control valve. On modern vehicles, the purpose of the idle air control valve is to regulate your idle, and keep the idle smooth. The idle valve is controlled by the ECU or the computer, and when in gear the idle should be between 800 and 1000 rpm, and not in gear, between 700 and 900 rpm

in all fuel injected cars you do not adjust idle. All you can do is clean the throttle and replace the Idle Air Control valve and check data thru a scanner to see if any sensors are out of specs. If this car has a maf sensor in the air filter tube it could become contaminated and cleaning or replacemnet will allow it to see more air which in turn allows the computer to add more fuel for better idling and accelration.

I'm assuming you have the 3.3l v-6. When I look up the part, it seems to have slotted holes. Therefore, it is designed to be adjusted after installation. If your tps has these slotted bolt holes, adjust it to satisfy the settings in the test procedure below.

1. Remove air cleaner. Disconnect the TPS harness from the TPS.
2. Using suitable jumper wires, connect a digital voltmeter J-29125-A or equivalent to the correct TPS terminals A and B.
3. With the ignition ON and the engine running, The TPS voltage should be 0.3-1.0 volts at base idle to approximately 4.5 volts at wide open throttle.
4. If the reading on the TPS is out of specification, check the minimum idle speed before replacing the TPS.
5. If the voltage reading is correct, remove the voltmeter and jumper wires and reconnect the TPS connector to the sensor.
6. Reinstall the air cleaner.

there is no way to adjust the idle on a computer controlled car. If your having an idle issue most likely the injectors are clogged or the Idle air control valve is bad. Try cleaning the throttle body around the throttle plate. If this doesnt help and you have no codes present I would get a data scanner to make sure the throttle position sensor is giving the correct data or test it with a meter. At idle it should be about 1 volt on the center wire. Some are adjustable. If all this checks out then replace the IAC

Idle air control at base of throttle body. Passages could be plugged or idle hard stop needs adjusting.

Air Intake System Sensors Air intake system sensors include a heated resistor-type mass air flow (MAF) sensor and throttle position (TP) sensor; both supply data to the powertrain control module (PCM). The PCM also monitors engine speed.
Air Intake System Control Devices The idle air control (IAC) solenoid regulates idle speed by adjusting the amount of air allowed into the intake manifold. Adjustment is made by varying the duty cycle output by the powertrain control module (PCM). The PCM will increase the duty cycle for added mechanical or electrical loads. The IAC solenoid is combined with the fast idle control (FIC) solenoid which is turned on when the air conditioner is engaged to help compensate for the additional load. The IAC valve must be replaced as an assembly with the FIC solenoid.
Fast Idle Control (FIC) Solenoid The fast idle control (FIC) solenoid (Figure 1) compensates for idle speed change caused by the operation of the air conditioner compressor. The FIC solenoid is controlled by the FIC relay. The FIC relay is energized when the air conditioner clutch is energized and the relay allows the FIC solenoid to turn on and let an additional volume of air into the intake manifold.
Figure 1: Fast Idle Control (FIC) Solenoid

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Throttle Body (TB) The throttle body (TB) controls the amount of air that flows into the engine through a single butterfly valve. The single butterfly valve opening is determined by the accelerator pedal. The TB is cast with an air bypass channel and houses several emission-related components for the powertrain control module (PCM).
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Throttle Position Sensor (TP Sensor) The throttle position (TP) sensor responds to the accelerator pedal movement. The TP sensor is a potentiometer that transforms the throttle plate opening angle into output voltage and sends the voltage signal to the powertrain control module (PCM). In addition, the sensor detects the opening and closing speed of the throttle plate and sends the voltage signal to the PCM. Also, the TP sensor is used to determine the air intake when the mass air flow (MAF) sensor fails. This mode of operation is called Fail Safe.
The TP sensor integrates the idle (IDL) switch within the housing. The IDL switch detects when the throttle plate is closed and an idle condition occurs. The PCM is supplied with this input signal.

IDLE SPEED