You can't adjust the ignition timing on your engine. It can only be checked.
Get the engine up to operating temperature and then turn off the engine. Connect a timing light to #1 cylinder. At the diagnostic connector under the hood, install a jumper wire between the TE1 and the E1 terminals. Restart the engine and check the base timing. It should be 3?-7? BTDC. Remove the jumper wire and check the controlled timing. It should be 7?-18? BTDC.
If the Check Engine light isn't on, there's nothing wrong with the catalytic converter.