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Home >> Buick >> 2003 >> Century Base >> Repair and Diagnosis >> Engine Performance >> Engine Control System - On-Vehicle Adjustments >> Idle Speed & Mixture >> Idle Speed (V8) >> 4.0L (Aurora) & 4.6L (DeVille & Seville)

4.0L (Aurora) & 4.6L (DeVille & Seville)

Start and operate engine at idle for 15 seconds. Turn ignition OFF. Wait 15 seconds. Restart engine. PCM will now properly control idle speed.

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