![]() ![]() That would indicate something was wrong with the valve. I did recheck a week ago for freedom of movement of IACV and it was flawless. I was going to remove electromagnetic Plug aka black piece, and see if it starts. I was going to try something I read on your site. The Rpms do not drop when releasing the throttle when in park or neutral. The car dives but it does not rev low like it use to. The IACV moved freely and no leaks once I used an original Lexus gasket. EBay had new ones for about thirty dollars. I removed the black piece and the magnet broke off IACV. I am not sure I did a great job and the hesitation started again on a relegation. I did use carburetor cleaner and it was better than new. I removed the hesitation on acceleration. I can hear the idle control valve open because of the high wine but settles down a little. I do not think the battery has nothing to do with the high idle. I tried the idle relearn procedure and reset the ECU. Car drives with no hesitation but I do noticed that I get that additional surge one stopping due to Increase in Rpm's. Rpm's drop but very slowly when I depress accelerator. I used a brand new gasket when placing throttle body back. I must also note that I leaned throttle body well when it was removed. I removed the electromagnetic motor which is the black piece. I used carburetor cleaner, propane, and water. I checked for vacuum leak at least 7 times. It Rpm's would eventually get down to 1100 but would have a tendency to go higher after car was driven. I started the vehicle and the Rpm's were very high at 2100 Rpm's. The price from from the original was very different. The part looked just like the one I removed. I replaced it with a brand new part from eBay. However, you can always contact one of the certified technicians from Yourmechanic to replace your idle control valve for you.I replaced IACV valve on my vehicle listed above. Even beginners should be able to replace this valve. Having a properly working idle control valve will make a huge difference in the driveability of your vehicle. Depending on your particular vehicle and ambient air temperature, your idle speed should hold steady between 550 RPMs (at the very lowest when it’s hot outside) and 1,000 RPMs (at the highest and at lower temperatures). Tighten down the bolt so that any engine vibration won’t rattle it loose. Reattach the negative battery cable to the battery. Ensure the terminal is making a proper connection and the clip is fully engaged to secure this connection. Reattach the wiring harness to the valve. Warning: Do not overtighten the bolts because it may cause a leak or improper function with the system.Use your socket and ratchet to snug them down gradually one by one. Then put the new valve in place and install the retaining bolts, hand tightening them to the seat. Verify that the wiring terminals, retaining bolt pattern, and seat placement are all the same. First, compare the old valve you are replacing with the new valve. This assures a clean seal between the valve and its seat. With the seat for the valve exposed, use the throttle body cleaner to clean the area you will attach the new valve to. With the bolts and wires now removed, the valve should just pull out of place. Remove each of the valve’s retaining bolts. ![]() Step 4: Remove the old idle control valve. There will be a clip or a tab to disconnect, and it might be easier to gently remove it with a pair of pliers. Locate the wiring harness connected to the valve and release the electrical terminal from the valve. The valve will nearly always be located on the intake manifold. Your vehicle’s owner’s manual will have information on the exact location. The location of the idle control valve will depend on the make and model of your vehicle. Disconnect the negative battery cable from the battery and set it aside. Part 1 of 1: Replacing an idle control valve. Newer models are less likely to be serviceable or capable of being cleaned. Sometimes the valve itself needs to be replaced, while other times cleaning the valve and other involved components around it can improve function and communication between the valve and the computer. These valves can also accumulate carbon buildup which causes issues with the valve and surrounding components. This steady pace is mandated by the vehicle’s idle control valve, which is also known as an idle air control valve.Ī failing valve can cause the check engine light to come on, rough idling, stalling, and sudden increases or decreases of RPMs while at a stop. Your vehicle’s idle speed should remain the same while at a complete stop. With the vehicle at a stop and no gas being applied by the driver, the computer must maintain a minimum number of RPMs so that the engine is still on and ready to go at any moment. The speed of an engine’s RPMs while at a stop is called idle or idle speed. ![]()
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