Subaru impreza Where on the manifold is the Idle air control solenoid valve? ON a 99 Subaru impreza Sedan 2.2 Engine?

Extra wire for somthing you do not have.

Check if you have rough idling as well. You may want to clean out the MAF sensor found at its intake manifold. You may use carb cleaners to spray it or tuner sprays. Other than that it could be loose wiring or vacuum hoses. A faulty or dirt Idle Air control valve may cause the problem.

Not really enough info to give an accurate diagnosis but you may check the Idle Control solenoid. Some refer to it as Idle Air Control valve. or sensor

First, make sure your airfilter is not plugged. If it is, the engine is compensating for the lack of air intake. If not, consider replacing the Idle Control Valve. Inquire with an auto parts dealer (store) for this part.
Please let me know if you need further assistance.
carsandcomps,
Guru, Premium Expert @ Fixya.com

Here is a list of Subaru diagnosis codes. If these are not what you are coming up with let me know the numbers you are getting and I will look them up on my genisys scanner to further assist you.
1111 No codes stored
11 Crankshaft position sensor (Don't confuse with above, usually when the crankshaft sensor if dodgy the thing won't start anyway)
12 Starter switch faulty
13 Camshaft position sensor
14 Injector no.1
15 Injector no.2
16 Injector no.3
17 Injector No.4
21 Engine temp sensor
22 Knock sensor
23 Mass air flow sensor
24 Idle air control sensor (usually accompanied by running too fast/slow)
31 Throttle position sensor
32 O2 sensor
33 Vehicle speed sensor
35 Emissions canister purge valve
38 Torque control signal (Automatics)
42 Closed throttle position
44 Turbo wastegate regulator malfunction
45 MAP sensor
49 CO adjustment resistor for older cars not fitted with cats
51 Neutral switch (Manual gearbox)

sounds like you have a problem. alot of times the coolant temp switch will cause the idle to go up and down. asfar as the speedo, I believe it works off a switch instad of the cable. this I would take to dealer. missing speed sensor is not good. have it checked at dealer.

it's on the throttle body. Here's a Quest with same 3.0L engine. These often need cleaning with carb or throttle body cleaner

Idle Air Control (IAC) Valve When the engine (6007) is running but not at idle, the throttle valve controls the amount of air admitted into the engine. The powertrain control module (PCM) (12A650) increases the fuel injection output in proportion to the increased airflow to achieve the appropriate air/fuel ratio. During idle, the throttle valve is almost fully closed. It is therefore necessary for the idle air control system to supply air for combustion during idle. The idle air control (IAC) valve allows a metered amount of air to enter the intake manifold (9424). The camshaft position (CMP) sensor detects engine speed and sends a signal to the PCM. The PCM sends a duty cycle (On/Off) signal to the IAC valve which allows additional air to enter the intake manifold. Air is added by the IAC valve to maintain the set lowest idle speed at which the engine can operate. The idle speed adjusting screw allows adjustment of the airflow into the intake manifold.


Fast Idle Control (FIC) Solenoid The fast idle control (FIC) solenoid helps maintain a constant idle speed while the air conditioning is operating. When the air conditioning is turned on, the front climate control panel sends out two signals. One signal is sent to the powertrain control module (PCM) (12A650) to engage the A/C compressor (19703). The second signal is a ground signal sent to the FIC solenoid relay, to engage the FIC solenoid. The FIC solenoid supplies additional air to adjust the increased engine load.

Its mounted on the intake manifold.

no no no do not take the manifold off. i just changed on the other day just take off the air intake tube. the sensor is up towards the top of motor. its right next to the egr solenoid valve. on the passenger side of the motor.

i have the same problem the red check engine light :(