I have a new IAC valve for this car and want to know exactly how to proceed with the replacement. The car has a 1.9L engine.
The valve is meant to solve a problem with rough idle when the engine is cold. The AC causes the car to stall out at any time when I'm idling.
The valve looks simple enough to replace. However, the guy at the auto parts store told me to disconnect the battery when I make the replacement. Why is this necessary? More important, do I just disconnect the battery, replace the valve and then hook the battery back up?
Second, the valve has a black knob on the side. What is this knob for?
Finally, do I need to make specific adjustments in the idle speed? I just wonder if I'm going to need an RPM guage.
Thanks.