| Light Duty Emissions (8500 GVWR Or Less) |
| 2.2L (135") 4-Cyl. TBI | PCV, EVAP, TWC, FR, EGR, SPK, O2S, CEC, MIL EVAP-VC, EVAP-TPCV, EGR-CS, SPK-EST | 1 |
| 3.1L (190") V6 TBI | PCV, ACL, EVAP, TWC, FR, EGR, SPK, O2S, CEC, MIL EVAP-VC, EVAP-CPTVS, EGR-CS, SPK-EST, SPK-ESC | 1 |
| 3.8L (231") V6 MFI | PCV, EVAP, TWC, FR, (4) EGR, SPK, O2S, CEC, MIL EVAP-VC, EVAP-CPCS, EVAP-TPCS, EGR-CS, SPK-EST, SPK-ESC | 2 |
| 4.3L (262") V6 CPI | PCV, EVAP, TWC, FR, (4) EGR, SPK, O2S, CEC, MIL EVAP-VC, EVAP-CPCS, SPK-EST, SPK-ESC | 2 |
| 4.3L (262") V6 TBI | PCV, ACL, EVAP, TWC, FR, EGR, SPK, O2S, CEC, MIL EVAP-VC, EGR-CS, AP-ACV, SPK-EST, SPK-ESC | 2 |
| 5.0L (305") V8 TBI | PCV, ACL, EVAP, TWC, FR, EGR, SPK, O2S, CEC, MIL EVAP-VC, EGR-CS, SPK-EST, SPK-ESC | 1 |
| 5.7L (350") V8 TBI | PCV, ACL, EVAP, TWC, FR, EGR, SPK, (5) AP, O2S, CEC, MIL EVAP-VC, EGR-CS, (5) AP-ACV, SPK-EST, SPK-ESC | 1 |
| 7.4L (454") V8 TBI | PCV, ACL, EVAP, OC, FR, (4) EGR, SPK, O2S, CEC, MIL EVAP-VC, EGR-CS, SPK-EST, SPK-ESC | 2 |
| Heavy Duty Emissions (8501 GVWR Or More) (3) |
| 4.3L (262") V6 TBI | PCV, ACL, EVAP, OC, FR, EGR, SPK, O2S, CEC, MIL EVAP-VC, EGR-CS, SPK-EST, SPK-ESC | 1 |
| 5.7L (350") V8 TBI | PCV, (6) ACL, EVAP, OC, FR, EGR, SPK, O2S, CEC, MIL EVAP-VC, EGR-CS, SPK-EST, SPK-ESC | 1 |
| 7.4L (454") V8 TBI | PCV, ACL, EVAP, OC, FR, (4) EGR, SPK, O2S, CEC, MIL EVAP-VC, EGR-CS, SPK-EST, SPK-ESC | 2 |
| (1) Major emission control systems and devices are listed in bold type. Components and other related devices are listed in light type. (2) See GENERAL MOTORS - TRUCKS in EGR FUNCTION TESTING section. Use specified test number. (3) For emission applications on gasoline-powered motor homes 8501 GVWR or more & built on a motor home chassis, see appropriate CLASS "A" MOTOR HOMES table. (4) Linear EGR valve. (5) Except Fed. & high altitude A/T models. (6) Some models. |
