Emission System Application Chart

Footnotes:

X - Equipped

- Not Equipped

1 - Timed at No. 1 cylinder W/engine at normal operation temperature & distributor vacuum advance hose disconnected & plugged.

2 - C, G, K, P Series Except 5.0L VIN H, HEI; 5.0L VIN H. HEI/EST. S/T Except Calif. 2.8L, HEI; Calif. 2.8L, HEI/EST. Caballero/El Camino, HEI/EST.

3 - One O2S.

4 - W/4 wire Electronic Spark Timing connector, at distributor, disconnected.

5 - Exc. high alt.

6 - High alt.

7 - Exc. cab-chassis, less A/C 16 degrees BTDC @ 650 RPM; with A/C 14 degrees BTDC @ 650 RPM. Cab-chassis, 16 degrees BTDC @ 650 RPM.

8 - Exc. cab-chassis, 6 degrees BTDC @ 650 RPM. Cab-chassis, 8 degrees BTDC @ 650 RPM.

9 - W/jumper wire connected between Assembly Line Diagnostic Link terminals A & B. The connector is located in the passenger compartment, under the instrument panel, to the right of the steering column.

10 - Exc. C10 series, 10 degrees BTDC @ 650 RPM; C10 series, 10 degrees BTDC @ 600 RPM.

11 - Exc. C10 series, 10 degrees BTDC @ 700 RPM; C10 series, 10 degrees BTDC @ 625 RPM.

12 - P20-30 incomplete vehicles not equipped.

13 - Caballero & El Camino.

14 - C, K, G & P Series.

15 - Diesel engine EGR system.

16 - Back pressure EGR valve system.

17 - Some C10 models not equipped.

18 - Back pressure EGR valve system.

19 - Type, TWC; number of catalytic converters, 1.

20 - Type, OC; number of catalytic converters, 1.

21 - Solid State Ignition (SSI).

22 - Distributor Ignition (DI)/EIS.

23 - Pump or pulse type, refer to vehicle emission control information label.

24 - Pump type.

25 - C-3 System.

26 - Closed Loop Emission Control System.

27 - DI/HEI/EST.

28- On CA models, scribed marks on pump & front cover should be aligned. On FED models, half circle marks on pump & front cover should be aligned.

29 - Certain El Camino models, may experience an inoperative canister purge thermo-vacuum switch.