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This is not an easy matter to solve. The idle is set at the time of MANUFACTURE and is a function of [IAC] Idle air control valve. Throttle stop shrew positioning and [eecu] engine electronic control unit. Inspect the Idle air controller after removing it from the throttle body. the valve within it[ that looks like a donut ] can sometimes be adjusted to a more closed setting by turning it.

Check the Air Condition To verify that engine idles higher when it is turned on. take a scanner and check the fuel trim Intake air tempature, coolant temprature and ignition advance . Inspect the throttle pedal cable and throttle valve travel. Sometimes disconnection the battery turning the lights on to drain the system then re powering the car would re flash the computer. "Not my best remedy" but you can also adjust the trottle stop shrew or slightly bend the throttle stop tab

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14y ago
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Q: 2001 Lincoln ls idle to high?
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