![]() ![]() ![]() What does an idle air control valve do for your car? In this article, we’ll go over the basics of the idle air control valve and how to remedy issues related to failure of the part. When this part fails, it can cause troubling symptoms in your car and lead to serious performance issues. One part that affects your car’s ability to idle smoothly is the idle air control valve. Your car is made up of tons of parts and systems that keep it running smoothly at all times-even while the car is idling. if adjusted with idle correct, but this is unlikely your surging problem it is usually accustome to the IAC bieng dirty.Issues that Arise Due to a Bad Idle Air Control Valve if not adjust screw at lower part untill it does. To test it warm truck up turn key to on position with motor off, the center wire to ground should read 0.9 volts to ground. If cleaning the IAC and resetting computers codes doesnt help then try the throttle positioning sensor. my 2.9 used to do that, and even though you have a new motor chances are they used the old throttle body and all the fuel injection system from before I would start with the IAC and see if it helps, but remember it takes unhooking the battery to reset the codes in the computer or approximatly 100 starts of a motor. If the vehicle does not idle at proper RPM (too low), there are no vacuum leaks, and the TPS calibration is correct, than the unit is most likely faulty. When the unit is reinstalled, it should return to normal idle speed. Unplug the unit’s electrical connector, and the idle should drop to about 650 RPM. Testing may be achieved by bringing the engine to operating temperature, noting the idle speed (should be within spec). This is also a good time to clean the intake, and EGR ports (if applicable). ![]() Continue cleaning until unit is clean, like new reinstall unit. Once off of the vehicle, clean with throttle body cleaner (or a good carburetor cleaner). ![]() Cleaning is achieved by removing the electrical connector, and two screws holding it on. Many idle and stalling issues tend to be blamed on these units. These units may become dirty, and need cleaning. The extra air is accompanied by extra fuel to bring the idle up to proper speed, and when cold, allows a high idle condition. This unit is electrically controlled by the computer, and allows air to flow into the intake at idle, bypassing the throttle plate. found on drivers side of intake manifold. The IAC is usually a cylindrical unit attached to the upper intake manifold. ![]()
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June 2023
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