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the therm iac not electric? drain collent 1/4out remove iac hoses. remove iac, reverse above. if electric. same, but only pull the wires. then unit. alldata.com is my god, my god of facts, so should you.... why work blind, for $15 bucks.
The IAC is on the bottom of the throttle body and has a hole in the bottom of the throttle body that lets air into the IAC. YOu do not have to remove it, if you do remove it the throttle body would have to come off and a new gasket would be required. Usually spraying through with throttle body cleaner will clean the IAC so it functions properly. About your P0505 faut code, The IAC (Idle Air Control) valve controls the idle speed of the engine. At idle the throttle plate is closed, of course. The IAC is computer controlled and allows only a certain amount of air around the throttle plate. This metered air controls the idle speed. The IAC has a "plunger" or "shutter" that moves to open or close the bypass air passageway. The more air the IAC allows around the throttle plate, the higher the idle. The PCM (Powertrain Control Module) uses the IAC valve to keep the idle speed correct with varying engine demands. Can be a three or four wire sensor depending on the model. The PCM monitors voltages of the IAC circuits and if it detects an incorrect voltage on one or more of the IAC motor circuits it will set P0505. NOTE: Problems with the IAC would only be noticeable at idle or when throttle is closed. Symptoms may include:MIL (Malfunction Indicator Lamp) illuminationEngine stalls and may not idle unless throttle is depressedIntermittently stalls when letting off the throttleEngine may idle too high Potential causes of an P0505 code include:IAC motor connector is damaged (check connector and pins for damage, and moisture)One or more IAC circuits open or shorted to groundOne or more IAC circuits are shorted to voltageIAC has failedPCM has failed Possible Solutions:This should be a fairly straightforward diagnosis. Start by clearing the fault codes. Then unplug the IAC and start the engine (This may cause other IAC codes to set. Just ignore them for now). If the P0505 code doesn't reset, replace the IAC. It is internally shorting one of the IAC circuits. If the code DOES return after unplugging the IAC and starting the engine, then you know it isn't the IAC motor. Visually check the wiring harness all the way back to the PCM. You may need to visually inspect the harness by removing all the insulation off the wires. It is possible that the wires could be shorting to eachother or to other wires in the harness. If there are no wiring problems, and the code keeps returning with the IAC unplugged, you can check the PCM by removing the IAC wires from the PCM connector (or clipping the wires in a location where they can be repaired easily) and then start the engine (If you're not sure, don't do it. Take it to a qualified professional). Now if the code doesn't reset there is a problem with the wiring. Check for continuity on all the IAC wires. Any resistance points to a problem. Check for voltage on any(At this point there shouldn't be any voltages on the wires because they're clipped at one end and unplugged at the IAC). Repair as necessary. But if the P0505 code DOES reset after removing the IAC wires from the PCM connector(or clipping them), replace the PCM, there's a problem internally on the IAC control circuit. Hope this helps.
well, first of all remove from vehicle. most iac have 2 torx screws to remove it. use an old toothbrush or similar to clean it. do not put body of iac in any liquid or it will ruin it. just clean valve on end of iac. also do not push on iac valve, because it will mess up idle of vehicle. just clean the valve on end to remove carbon build up and dirt. you can use brake cleaner or throttle body cleaner for this. it is also a good idea to clean around throttle plate to remove carbon on throttle body itself. but do iac first and put back on throttle body. have a good day!
Idle Air Control (IAC) Valve OPERATION
The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the side of the throttle body. This valve allows air, determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal, to bypass the throttle plate in order to maintain the proper idle speed.
Fig. 1: Typical Idle Air Control (IAC) valve which is mounted to the throttle body - cutaway view shows air bypass direction
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REMOVAL & INSTALLATION
Disconnect the negative battery cable. To remove the IAC valve, first disconnect the negative battery cable, then the IAC wire harness plug
Next, remove the two IAC valve attaching bolts . . .
. . . and pull the valve from the intake manifold
Disengage the wiring harness connector from the IAC valve.
Remove the two retaining screws, then remove the IAC valve and discard the old gasket.
To install: When installing the valve, always discard the old gasket and install it using a new one
Clean the IAC valve mounting surface on the throttle body of old gasket material.
Using a new gasket, position the IAC valve on the throttle body. Install and tighten the retaining screws to 71-106 inch lbs. (8-12 Nm).
Attach the wiring harness connector to the IAC valve.
its located on the throttle body connected to your air intake manifold where your throttle cable connects on the throttle body there is a adjustment screw connected there
Ok, this is what I did a few months ago and my '03 Olds hasn't stalled since. Buy GM cleaner P/N 1052626 or GM X 66A or equivalent. Locate the Idle Air Control Valve (IAC). On the front of the throttle body you'll see a shot-glass-sized metal cylinder with a black 3 wire connector. This metal cylinder is just to the right of a rubber air line with a 90 degree elbow on it, this is the IAC. Removal: 1. With the car in park and the ignition OFF. Remove the electrical connector from the IAC. 2. Remove the 2 IAC attaching screws. 3. Remove the IAC from the throttle body. 4. Remove the IAC O-ring. NOTE: If the IAC has been in service: DO NOT push or pull on the IAC pintle. The force required to move the pintle may damage the threads on the worm drive. Also, DO NOT soak the IAC in any liquid cleaner or solvent, this may damage it. Cleaning: 1. Using the cleaner, clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage. I used the cleaner, shop towel, and a tooth brush. * If the air passage has heavy deposits, remove the throttle body for complete cleaning. * Shiny spots on the pintle seat are normal and do not indicate misalignment or a bent pintle shaft. 2. Inspect the IAC valve O-ring for cuts, cracks, or distortion and replace if damaged. NOTE: The IAC may be damaged if installed with the cone (pintle) extended more than 28mm (1 1/8in). Measure the distance that the valve is extended before installing a new valve. The distance from the IAC motor housing to the end of the pintle should be less than 28mm. Manually compress the pintle until the extension is less than 28mm. Install: 1. Install the IAC into the throttle body. 2. Install the 2 IAC attaching screws and torque to 27 lbs. 3. Install the electrical connector into the IAC. 4. The powertrain control module (PCM) will reset the IAC whenever the ignition is turned ON. 5. Turn the ignition ON. 6. Turn the ignition OFF. 6. Perform the IAC learn procedure. IAC Learn Procedure: 1. Start and idle the engine for 15 seconds. 2. Turn the ignition switch to the LOCK/OFF position. 3. Wait 15 seconds. 4. Restart the engine and check for proper idle operation. Hope this works for you too.
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