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To adjust the idle speed control on a Cadillac DeVille with a new part, first ensure that the engine is at normal operating temperature. Disconnect the negative battery cable for a few minutes to reset the engine control module (ECM). Reconnect the battery, then start the engine and allow it to idle without any load while monitoring the idle speed. If necessary, use a scan tool to check and adjust the idle speed per manufacturer specifications, or manually adjust the idle air control (IAC) if applicable.

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2mo ago

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