| Light Duty Emissions (8500 GVWR Or Less) |
| 2.5L (151") 4-Cyl. TBI | PCV, ACL, EVAP, TWC, FR, EGR, O2S, CEC EVAP-VC, EGR-CS | — |
| 2.8L (170") V6 TBI | PCV, ACL, EVAP, TWC, FR, (4) EGR, AIS, O2S, CEC EVAP-VC, EGR-CS | 1 |
| 4.3L (262") V6 TBI | PCV, ACL, EVAP, TWC, FR, EGR, SPK, (5) (6) AIS, O2S, CEC EVAP-VC, EGR-CS, SPK-ESC | 1 |
| 5.0L (305") V8 TBI | PCV, ACL, EVAP, TWC, FR, EGR, SPK, (7) AIS, O2S, CEC EVAP-VC, EGR-CS, SPK-ESC | 1 |
| 5.7L (350") V8 TBI | PCV, ACL, EVAP, TWC, FR, BP/EGR, SPK, (8) AIS, O2S, CEC EVAP-VC, BP/EGR-CS, SPK-EST | 1 |
| 7.4L (454") V8 TBI | PCV, ACL, EVAP, TWC, FR, EGR, SPK, AIS, O2S, CEC EVAP-VC, EGR-CS, SPK-ESC | 1 |
| Heavy Duty Emissions (8501 GVWR Or More) (3) |
| 4.3L (262") V6 TBI | PCV, ACL, EVAP, TWC, FR, EGR, SPK, AIS, O2S, CEC EVAP-VC, EGR-CS, SPK-ESC | 1 |
| 4.8L (292") 6-Cyl. 2-Bbl. | PCV, ACL, EVAP, (9) EGR, AIS, EFE EVAP-VC, AIS-DV, DCLV | 1 |
| 5.7L (350") V8 4-Bbl. | PCV, ACL, EVAP, (9) EGR, (8) SPK, AIS, EFE EVAP-VC, SPK-ESC | 1 |
| 5.7L (350") V8 TBI | PCV, ACL, EVAP, OC, (8) TWC, FR, EGR, SPK, (8) AIS EVAP-VC, EGR-CS, SPK-ESC | 1 |
| 6.0L (360") V8 TBI | PCV, ACL, EVAP, (8) OC, (8) FR, EGR, SPK EVAP-VC, EGR-CS, SPK-ESC | 1 |
| 7.4L (454") V8 4-Bbl. | PCV, ACL, EVAP, (9) EGR, AIS, EFE EVAP-VC, AIS-DV | 1 |
| 7.4L (454") V8 TBI | PCV, ACL, EVAP, (10) TWC, FR, EGR, SPK, AIS, O2S EVAP-VC, EGR-CS, SPK-CC | 1 |
| (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) Except Federal & high altitude A/T models, & "S" & "T" Series. (5) Electronically controlled. (6) Except "S" & "T" Series. (7) M/T only. (8) Some models. (9) Ported type. (10) California only. |
