Idle Speed & Ignition Timing
WARNING: This page is about a different car, the 2002 Saab 9-5, 2002 Saab 9-3, 2001 Saab 9-5, and 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
All models are equipped with a Distributorless Ignition System (DIS). Idle speed and ignition timing are controlled by (ECM) and are not adjustable. ECM relies on spark plug resistance to determine ignition timing. See TRIONIC ENGINE MANAGEMENT SYSTEM in THEORY & OPERATION article for a detailed description of ignition timing and idle speed control functions.