Has your 1985-1993 C4 Corvette been having problems idling? Then your Corvette's IAC (Idle Air Control) valve may be defective. Now, you can avoid costly repairs and check ups and test this valve yourself with our C4 Corvette 1985-1993 Idle Air Control Test Tool.
This IAC test tool allows you to measure the ECM current signal with your digital voltmeter. Quickly tells you if your IAC valve is functioning properly.