Emission System Application Charts
Footnote(s):
X - Equipped
- Not Equipped
1 - Except 4.4L, 5.0L/305 & 5.7L 4 Bbl., HEI/EST. 4.4L, 5.0L/305 & 5.7L 4 Bbl., HEI.
2 - Type, TWC; number of catalytic converters, 1.
3 - One O2S.
4 - Diesel engine.
5 - Static timing.
6 - Disconnect 4 terminal electronic spark timing wire connector to place system in ignition timing bypass mode. Connect a suitable inductive pickup timing light to ignition coil high tension lead near distributor. The pulley notch will appear to move slightly as each cylinder is fired during the ignition timing check. This slight pulley notch movement should be centered at the proper timing degree mark on the timing tab. The crankshaft pulley has two ignition notches located 180. apart. The notch for No. 1 cylinder is scribed across the three pulley sheave surfaces, while the second notch is scribed across the center sheave.
7 - FWD models.
8 - RWD models.
9 - Dynamic ignition timing using timing meter.
10 - Eighth digit of Vehicle Identification Number (VIN) denotes engine code.
11 - VIN H, Chevrolet engine.
12 - VIN 7, Chevrolet engine.
13 - VIN Y, Oldsmobile engine.
14 - Corvette models.
15 - Models w/FED 4-speed manual transmission & automatic transmission, adjust timing by disconnecting & plugging distributor vacuum advance hose; for CA & FED models w/5-speed manual transmission, adjust timing by disconnecting a wire EST connector at distributor.
16 - Disconnect 4 wire EST connector at distributor.
17 - Ground test terminal in connector under Instrument Panel.
18 - Disconnect green reference signal connector, rear of engine near distributor.
19 - Disconnect set timing bypass connector (tan/black wire). May be located at: 1, RH valve cover, 2, near blower motor, 3, near distributor, 4, taped to engine harness near left strut tower.
20 - Disconnect & plug distributor vacuum advance hose.
21 - Open set timing connector.
22 - Type, TWC+OC; number of catalytic converters, 1.
23 - Back-pressure EGR.
24 - AIR (Secondary Air Injection) pump type.
25 - ECM controlled EGR.
26 - Pulse width modulated EGR.
27 - Diesel engine EGR.
28 - Emission control system type A, PAIR (Pulse Air Injection); emission control system type B, AIR (Secondary Air Injection) pump type.
29 - Type, TWC or TWC+OC; number of catalytic converters, 1.
30 - On models which experience an EGR malfunction, poor performance/detonation, service modification can be performed.
31 - On models which experience fuel starvation at high altitude/high ambient temperatures, service modification can be performed.
32 - On models which experience a spark knock condition, a service modification can be performed.
33 - On models which experience a sticking EGR valve, service modification can be performed.
34 - On models which experience low speed tip-in stumble service modification can be performed.
35 - On Firebird models when replacing canister control valve, refer to Technical Service Bulletins.
36 - DI/HEI/EST/ESC.
37 - On certain Firebird models, the evaporative canister purge thermo vacuum switch may be inoperative.
38 - On certain Camaro, Caprice, Impala, Malibu, and Monte Carlo models, the evaporative canister purge thermo vacuum switch may be inoperative.
39 - Certain Cadillac models may experience a restricted catalytic converter.
40 - Certain California Cadillac diesel models may require service.
41 - Certain Bonneville and Grand Prix models may experience a poor engine performance/no start condition.
42 - Certain Firebird models may experience a poor engine performance/no start condition.
43 - C-3 system.
44 - Certain models may emit NOx pollutants in excess of California standards.
45 - Certain models may emit pollutants in excess of allowable standards due to a restricted catalytic converter.
46 - TBI system.
47 - MFI system.