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To adjust the engine idle speed on a Vauxhall Astra diesel, first, ensure the engine is at normal operating temperature. Locate the idle speed adjustment screw, usually found on the throttle body or near the injection pump, depending on the engine model. Carefully turn the screw clockwise to increase the idle speed or counterclockwise to decrease it, checking the RPM with a tachometer as you make adjustments. After adjustments, always ensure the idle speed is within the manufacturer's specified range for optimal performance.

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1mo ago

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