Rick's Free Auto Repair Advice

Posts Tagged: fluctuating idle

High idle, rough idle

High idle, rough idle — causes and fixes Diagnose and fix high idle or rough idle Any time you see a high idle, rough idle high, or hunting idle (idle speeds up and slows down), suspect a vacuum leak. Extra air leans out the exhaust mixture, which is detected by the oxygen sensor and reported to the powertrain control module (PCM). To correct the lean condition, the PCM adds fuel. As the engine speeds up, the PCM notices that you really haven’t pushed down on the gas (watches the throttle … Read More


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