P0420 is a fault with the catalytic converter or O2 sensors and can smell funny if the catalytic converter is bad.
Ignition Timing
1. Set parking brake. Start engine and ensure idle speed is correct. Turn ignition off, connect SCS Service Connector (07PAZ-0010100) to 2-pin service check connector. Connect tachometer. Run engine at 3000 RPM with no electrical loads (headlights, blower motor, rear defogger, A/C and cooling fan off) and transmission in Park or Neutral. When radiator cooling fan comes on, allow engine to idle.
2. 2-pin service check connector is located under right side of instrument panel. See Fig. 13 . Service check connector on uses a Brown wire and a Black wire.
3. Connect timing light to No. 1 spark plug wire. Check base ignition timing at specified engine idle. See IGNITION TIMING (DEGREES BTDC - RED MARK @ RPM) table. Red mark indicates degrees BTDC. White mark indicates No. 1 cylinder Top Dead Center (TDC). See Fig. 19 .
4. If timing is not as specified, loosen distributor hold-down bolts and rotate distributor to adjust timing. Rotate distributor counterclockwise to advance timing and clockwise to retard timing. Recheck timing after tightening distributor hold-down bolts.
5. Tighten distributor hold-down bolts to 13 ft. lbs. (18 N.m). Remove timing light, tachometer and SCS service connector.
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Friday, September 24th, 2010 AT 7:50 AM