Excessive Exhaust Emissions Or Odors

WARNING: This page is about a different car, the 2002 Isuzu Trooper, 2002 Isuzu Rodeo Sport, 2002 Isuzu Rodeo, 2002 Isuzu Axiom, and 2002 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.

Perform On-Board Diagnostic II System Check.
Perform Electronic Throttle Control (ETC) System Check.
Check fuel pressure.
Check ignition timing.
Check EVAP canister for fuel saturation.
Check PCV system operation.
Check for faulty spark plugs.
Check for lead contamination of catalytic converter.
Ensure the installed PROM is correct for that particular vehicle. Check with dealer for latest application information.
Check for improperly installed fuel filler cap.
Check EGR valve operation.
Check cooling system operation.
Check cooling fan for proper operation.
Check for vacuum leaks.
Check for faulty fuel injectors and connections.
Check for carbon build-up in cylinders.
Check for engine mechanical problems.
Check for use of excessive fuel additives.
Check for excessive exhaust emissions.