How to clean a throttle body and idle air control valve iac

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The RAV4 is equipped with an idle air control valve (IACV). The component allows the proper amount of air to bypass the throttle plate. This process ensures the RAV4 maintains the proper engine speed at idle. To maintain the efficiency of your vehicle, the IAC valve should be cleaned as needed.

The IAC shouldn't be cycled after it's removed from the throttle body. The IAC is a stepper motor and the ECM retains memory of the stepped positions. Extending the IAC pintle when removed puts it past the intended parameters. Also don't manually move the pintle.
I had to take off the throttle body since the philips screws holding the IAC valve on were difficult to get off (used jand impact driver). I would definitely get a new "o-ring" as it seals both air and coolant. If you replace the throttle body gasket, you will need some gasket dissolver to clean it up.
    1. The idle air control valve (usually called an IAC valve) helps maintain the proper idle speed on your vehicle. The Toyota 4Runner idle air control valve is mounted on the throttle body, as it is in all vehicles. Sometimes, carbon buildup near your idle air control valve can cause idling problems.
    2. Jul 17, 2007 · 5. You know when its clean when you hear a louder rushing noise from the throttle body when the connector is making the IAC work or open. 6. Then all you have to do is clean the area and inside of the throttle body with a tooth brush (old one is preferred) and connect everything. 7.
    3. Ifs function is to regulate the air supply to the throttle body with the. main throttle plate closed, hence the term Idle Air Control Valve. Going to work on it this AM - will let you know how I make out. Chris Bowne. Stonington, CT. 94 Escort 1.9 LX 5 Speed, 133K. 98 Volvo V70XC AWD Cross Country 117K.
    4. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC valve assembly and throttle body. The PCM determines the desired idle speed or bypass air and signals the IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air.
    5. They are located underneath the Throttle Body and connect to the Idle Air control valve. Step 3: Remove the throttle cable from the throttle body. Step 4: Remove the 2 12mm nuts on the top and the 2 12mm bolts on the bottom. Last edited by Lucky_317; Jan 2, 2005 6:02pm. Best 60' 1.959 best 1/4 - 13.7 @ 101mph.
    6. The backside of the butterfly valve, the entire IAC and throttle body were in remarkably good shape before the cleaning even though the caked on varnish suggested otherwise. A little surface cleaning and it looked good as new.
    7. Feb 11, 2018 · You may find it necessary to remove the air intake snorkel assembly (don’t forget the MAF connector if equipped) as well as the breather and surrounding vacuum lines to the throttle body, to gain better access to the IAC valve. Using a wrench, remove the IAC valve by turning it counter-clockwise (loosen) and remove the valve. Spray it down with carburetor cleaner until it’s clean and then proceed to spray some WD-40 on it for that little added protection. You can use a soft brush (like a ...
    8. Fig. 2 Oily gunk is found at the bottom of the IAC recess. Cleaning the IAC is a simple matter of removal, cleaning, and reinstalling. On the 3800 "C" engine it is found to the right of and below the throttle body. Access is much simpler if the hose between the throttle body and the air filter box is removed.
    9. When I reduce the power quickly (from 1500 to 650 rpm) the Idle Air Control Valve is not quick enough to maintain the rpm, they drop under 650 rpm, and the engine dies. If I drop the power slowly, the engine runs normally, and the rpm maintain normal at 650 rpm. I clean the IAC and perform the test.
    Idle Air Controller (IAC) Clean or replace the IAC (or IAB as some call it). This is a simple actuator that allows the computer to adjust air going through the throttle body (while the butterfly is closed) to keep the engine running at idle (roughly 700rpm). The controller uses 12v and has constant +12v power, the computer provides a ground ...
A faulty IAC can starve the engine of air at idle, resulting in stalling. Engine Won't Start . Although rare, there are instances where a faulty IAC can throw off the air/fuel mixture enough to prevent the engine from starting. How to Test an Idle Air Control Valve. Vacuum leaks and circuit problems can mimic a bad IAC valve.

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What is the best way to clean the IAC valve? Should it be removed from the throttle valve body and sprayed with carb cleaner "on the bench" or is it OK to just spray the carb cleaner in the throttle body with the engine running, like in the old days when we had carbuerators?<P>The thought of damaging the MAF sensor (just had to buy a new one) and the hernia of the plastic is still huge.

Jul 17, 2007 · 5. You know when its clean when you hear a louder rushing noise from the throttle body when the connector is making the IAC work or open. 6. Then all you have to do is clean the area and inside of the throttle body with a tooth brush (old one is preferred) and connect everything. 7. SOURCE: IAC Valve Location - 1996 Jeep Grand Cherokee The idle air control valve is located on the back of the throttle body. It has an oval electrical connector and two torx screws holding it in. Unplug the connector, remove the two screws then lightly tap the body with a soft faced mallet to loosen it from the body.The idle air control valve in the Toyota is an important component in controlling the Toyota's idle speed. The valve, commonly referred to as the IAC valve, allows the correct amount of air to bypass the throttle plate in order to maintain the proper idle speed. The valve will become dirty over time and cause the Toyota to stall or idle roughly.

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