How do you set ignition timing on a VW Polo 1.4i 2002?

To set the ignition timing on a 2002 VW Polo 1.4i, first ensure the engine is at operating temperature and the idle speed is correct. Disconnect the vacuum line from the distributor, then use a timing light to check the timing mark on the crankshaft pulley against the specified timing mark on the engine block. If the timing is off, loosen the distributor clamp and rotate it until the timing light indicates the correct timing, then retighten the distributor. Finally, reconnect the vacuum line and recheck the timing if necessary.