Exhaust Gas RECIRCULATION
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Savana, 2003 Chevrolet Silverado, and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For EGR system diagnosis, perform the following. On Chevy Express and Savana, see appropriate INSPECTION/MAINTENANCE PROCEDURES under DRIVE CYCLES
in SELF-DIAGNOSTICS - 4.8L, 5.3L & 6.0L EXPRESS & SAVANA - GASOLINE article. On Sierra & Silverado, see appropriate INSPECTION/MAINTENANCE PROCEDURES under DRIVE CYCLES
in SELF-DIAGNOSTICS - 4.8L, 5.3L & 6.0L "C", "K" & "N" SERIES - GASOLINE article.