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 for high fuel pressure. See CHART A-7.
^ Check for incorrect timing. See Vehicle Emission Control Information Label.
^ Check canister for fuel loading
^ Check injector balance. See CHART C-2A. Chart C-2A Injector Balance Test
^ Check for stuck PCV valve or blocked PCV hose.
^ Check condition of spark plugs, plug wires, and distributor cap.
^ 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.
^ Check EGR valve for not opening. See CHART C-7, or C-7A.
^ Check for vacuum leaks.
^ Check 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.