What Causes A Engine To Idle Up And Down?

What Causes A Engine To Idle Up And Down? A malfunctioning MAF sensor can cause a wild up/down engine idle speed (say, 0-2,000 rpm). This might be caused by a loose harness connection or by a damaged or contaminated sensing wire. The MAF sensor measures the amount of air flowing through the throttle valve. What … Continue reading What Causes A Engine To Idle Up And Down?