Excessive Exhaust Emissions (Odors)

^ If test shows higher than normal CO and HC, (also has excessive odors):
^ Check items which cause car to run RICH. Make sure engine is at normal operating temperature.
^ CHECK:

- Fuel pressure. See CHART A-7.
- Incorrect timing. See Vehicle Emission Control Information Label.
- Canister for fuel loading. See CHART C-3.
- Injector balance. See CHART C-2A.
- PCV valve for being plugged, stuck, or blocked PCV hose.
- Spark plugs, plug wires, and distributor cap. See Section 6D.
- Check for lead contamination of catalytic converter (look for removal of fuel filler neck restrictor).
^ IF TEST SHOWS EXCESSIVE NOx:
^ Check items which cause car to run LEAN, or to run too hot.
- EGR valve for not opening. See
CHART C-7.
- Vacuum leaks.
- Coolant system and coolant fan for proper operation. See CHART C-12.
- Remove carbon with top engine cleaner. Follow instructions on can.
- Check ignition timing for excessive base advance. See Emission Control Information label.