LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 1979 >> Wagoneer Base >> Repair and Diagnosis >> Engine Performance >> Emissions >> Emission Control Applications >> Jeep Emission Control Applications
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Jeep Emission Control Applications

1966-79 JEEP

Year, Engine & Fuel System Emission Control Systems & Devices Remarks
1966-67 All Models PCV, AIS 1 1 - Light duty Calif. only.
1968    
  2.2L (134") 4-Cyl. 1-Bbl. PCV, AIS 1 - Light duty only.
  3.7L (225") V6 2-Bbl. 2 PCV, AIS 1 2 - Heavy duty, PCV only.
  3.8L (232") 6-Cyl. 1-Bbl. 2 PCV, AIS 1  
  5.4L (327") V8 2-Bbl. 2 PCV, AIS 1  
  5.4L (327") V8 4-Bbl. 2 PCV, AIS 1  
  5.7L (350") V8 2-Bbl. 2 PCV, TAC 1 , CCS 1  
1969    
  2.2L (134") 4-Cyl. 1-Bbl. PCV, AIS 1 - Light duty only.
  3.7L (225") V6 2-Bbl. 2 PCV, AIS 1 2 - Heavy duty, PCV only.
  3.8L (232") 6-Cyl. 1-Bbl. 2 PCV, AIS 1  
  5.4L (327") V8 2-Bbl. 2 PCV, AIS 1  
  5.4L (327") V8 4-Bbl. 2 PCV, AIS 1  
  5.7L (350") V8 2-Bbl. 2 PCV, TAC 1 , CCS 1  
1970    
  2.2L (134") 4-Cyl. 1-Bbl. PCV, AIS 1 , EVAP 2 1 - Light duty only.
  3.7L (225") V6 2-Bbl. 3 PCV, AIS 1 , EVAP 2 2 - Calif. only.
  3.8L (232") 6-Cyl. 1-Bbl. 3 PCV, AIS 1 , EVAP 2 3 - Heavy duty, PCV only.
  5.4L (327") V8 2-Bbl. 3 PCV, AIS 1 , EVAP 2  
  5.4L (327") V8 4-Bbl. 3 PCV, AIS 1 , EVAP 2  
  5.7L (350") V8 2-Bbl. 3 PCV, TAC, EVAP 2 , CCS  
1971    
  2.2L (134") 4-Cyl. 1-Bbl. PCV, AIS, EVAP 1 - Calif. & light duty.
  3.7L (225") V6 2-Bbl. 2 PCV, TAC, AIS, EVAP 2 - Heavy duty, PCV only.
  4.2L (258") 6-Cyl. 1-Bbl. 2 PCV, EVAP 1 , TCS  
  5.0L (304") V8 2-Bbl. 2 PCV, AIS, EVAP 1 , TCS  
  5.9L (360") V8 2-Bbl. 2 PCV, AIS, EVAP 1 , TCS  
1972    
  3.8L (232") 6-Cyl. 1-Bbl. PCV, EVAP, TCS 1 - M/T models only.
  4.2L (258") 6-Cyl 1-Bbl. PCV, EVAP, TCS 2 - All M/T models & heavy duty models with A/T.
  5.0L (304") V8 2-Bbl. PCV, TAC 4 , AIS 1 , EVAP, TCS  
  5.9L (360") V8 2-Bbl. PCV, TAC 4 , AIS 2 , EVAP 3 , TCS 3 - All models exc. heavy duty models with M/T.
      4 - Light duty only.
1973    
  3.8L (232") 6-Cyl. 1-Bbl. PCV, TAC, EVAP, EGR 1 , TCS 1 - Commando models only.
  4.2L (258") 6-Cyl. 1-Bbl. PCV, TAC, AIS 2 , EVAP, EGR 3 , TCS 2 - Wagoneer, Truck only.
  5.0L (304") 6-Cyl. 1-Bbl. PCV, TAC, AIS, EVAP, EGR, TCS 3 - Except CJ & DJ models.
  5.9L (360") V8 2-Bbl. PCV, TAC, AIS, EVAP 4 , EGR, TCS, VTM 5 4 - Except Federal truck 47 & 48 models.
  5.9L (360") V8 4-Bbl. PCV, TAC, AIS, EVAP, EGR, EAC, TCS  
      5 - Truck 47 & 48 models only.
1974    
  3.8L (232") 6-Cyl. 1-Bbl. PCV, TAC, EVAP, EGR, CTO, TCS 1 - Exc. Fed. M/T CJ5/6
  4.2L (258") 6-Cyl. 1-Bbl. PCV, TAC 2 , AIS 1 , EVAP 2 , EGR 2 , CTO 2 , TCS 2 2 - Used on all Fed. models, Only used in Calif. on M/T CJ5/6 models.
  5.0L (304") V8 6-Cyl. 1-Bbl. PCV, TAC, AIS, EVAP, EGR, CTO, TCS 3 , VTM 4  
  5.9L (360") V8 2-Bbl.    
  Man. Trans. PCV, TAC, AIS, EVAP, EGR, SPK, CTO, TCS 5 , TVS, VTM 6 3 - Federal only.
      4 - Calif. only.
  Auto. Trans. PCV, TAC, AIS, EVAP, EGR, SPK, BPS 7 , CTO, TCS 5 , TVS, VTM 6  
      5 - Fed. exc. truck 46.
      6 - All Calif. models, Federal Heavy duty truck & 46 only.
  5.9L (360") V8 2-Bbl. PCV, TAC, AIS, EVAP, EGR, SPK, BPS 4 , CTO, TCS 7 , TVS  
  6.6L (401") V8 4-Bbl. PCV, TAC, AIS, EVAP 8 , EGR, CTO, EAC 8 , VTM 8 7 - Exc. Federal Cherokee.
      8 - Exc. Federal Truck 46.
1975    
Light Duty Emissions   1 - Calif. only.
  3.8L (232") 6-Cyl. 1-Bbl. PCV, TAC, EVAP, EGR 1 , TCS 7 2 - Not used on J10 or Cherokee.
  4.2L (258") 6-Cyl. 1-Bbl. PCV, TAC, EVAP 2 , EGR 1 3 , FR 4 , TCS 3 - Used on J10 Fed. models.
  5.0L (304") V8 2-Bbl. PCV, TAC, AIS, EVAP, OC, EGR, FR, TCS 1 4 - Used on Fed. Cherokee & J10 models only.
  5.9L (360") V8 2-Bbl. PCV, TAC, AIS, EGR 1 5 , FR, VTM 6  
  5.9L (360") V8 4-Bbl. PCV, TAC, AIS, EVAP 1 , EGR, BPS 1 , FR, VTM 6 5 - Used on Fed. J10/20 only.
  6.6L (401") V8 4-Bbl. PCV, TAC, AIS, EVAP 1 , EGR, BPS 1 , FR, VTM 6 6 - M/T models only.
      7 - CJ5/6 only.
Heavy Duty Emissions 8    
      8 - Heavy duty same as light duty.
1976    
Light Duty Emissions    
  3.8L (232") 6-Cyl. 1-Bbl. PCV, TAC, AIS 1 , EVAP, OC 1 , EGR, SPK 1 , BPS, EGR-CTO, FR 1 - Calif. vehicles only.
  4.2L (258") 6-Cyl. 1-Bbl. PCV, TAC, AIS 1 , EVAP, OC 1 , EGR, SPK 2 , BPS 2 , EGR-CTO, FR 2 2 - CJ5/7 models only.
  5.0L (304") V8 2-Bbl. PCV, TAC, AIS, EVAP, OC, EGR, SPK, EGR-CTO, FR, VTM 3 3 - Heavy duty same as Light duty.
  5.9L (360") V8 2-Bbl. PCV, TAC, AIS, EGR, SPK, EGR-CTO, FR, VTM 3  
  5.9L (360") V8 4-Bbl. PCV, TAC, AIS, EVAP 1 , EGR, SPK, EGR-CTO, FR  
  6.6L (401") V8 4-Bbl. PCV, TAC, AIS, EVAP 1 , EGR, SPK, BPS 1  
Heavy Duty Emissions 3    
1977    
Light Duty Emissions    
  3.8L (232") 6-Cyl. 1-Bbl. PCV, TAC, AIS, EVAP, OC 1 2 , EGR, SPK 2 , FR, TCS 1 1 - High Alt. models only.
  4.2L (258") 6-Cyl. 1-Bbl. PCV, TAC, AIS 2 , EVAP 2 , OC 1 3 , EGR, SPK, FR 2 , TCS 1 2 2 - CJ models only.
  5.0L (304") V8 2-Bbl. PCV, TAC, AIS, EVAP 1 , OC, EGR 4 , SPK 6 , BPS 5 , EAC 1 , TCS 1 3 3 - Calif. CJ models only.
      4 - Not used on Fed. M/T.
  5.9L (360") V8 2-Bbl. PCV, TAC, AIS, EGR, SPK, VTM 7 8 5 - Calif. M/T only.
  5.9L (360") V8 4-Bbl. PCV, TAC, AIS, EGR, SPK, VTM 7 8 6 - High Alt. & Calif. models.
  5.9L (360") V8 4-Bbl. PCV, TAC, AIS, EVAP 8 , OC 8 , EGR, SPK, BPS 8 , FR 8 , VTM 7 8 7 - Fed. M/T only.
  6.6L (401") V8 4-Bbl. PCV, TAC, AIS, EVAP 8 , OC 8 , EGR, SPK, BPS 8 , FR 8 , VTM 7 8  
      8 - Calif. models only. 1
      9 - Heavy Duty same as Light Duty.
Heavy Duty Emissions 9    
1978    
Light Duty Emissions    
  3.8L (232") 6-Cyl. 1-Bbl. 1 PCV, ATC, AIS, EVAP, OC 2 , EGR, SPK, TAC 1 - 232" engine not available in Calif.
  4.2L (258") 6-Cyl. 1-Bbl. PCV, TAC, AIS, EVAP, OC 3 , EGR, SPK, TCS 4  
  5.0L (304") V8 2-Bbl. PCV, TAC, AIS, EVAP, OC, EGR, SPK 5 2 - Fed. High Alt. only.
  5.9L (360") V8 2-Bbl. PCV, TAC, AIS, EVAP, OC, EGR, SPK, TCS  
      3 - Calif. & High Alt. only.
      4 - Calif. CJ7 A/T only.
      5 - All High Alt. & Calif. CJ7 A/T models only.
Heavy Duty Emissions 1    
      6 - Federal models only.
  4.2L (258") 6-Cyl. 2-Bbl. 6 PCV, TAC, EGR, SPK 7 - Used on some Fed., Cherokee, Wagoneer & Truck models.
  5.9L (360") V8 2-Bbl. PCV, TAC, AIS, EGR, SPK, VTM 7  
  5.9L (360") V8 4-Bbl. PCV, TAC, AIS, EGR, SPK, VTM 7  
  6.6L (401") V8 4-Bbl. PCV, TAC, AIS, EGR, SPK, VTM 7  
1979    
Light Duty Emissions    
  3.8L (232") 6-Cyl. PCV, TAC, AIS, EVAP, OC 2 , SPK 1 , EGR-TVS 1 - Calif. models with H.D. cooling and all Fed. models.
  4.2L (258") 6-Cyl. PCV, TAC, AIS, EVAP, OC 2 , EQR, SPK 2 , EGR-TVS  
  5.0L (304") V8 PCV, TAC, AIS, EVAP, OC, EGR, SPK 5 , NLVR 2 - H.D. cooling models only.
  5.9L (360") V8 TAC, VTM 6 3 - M/T Truck models only.
      4 - All exc. M/T Fed. models with standard cooling.
Heavy Duty Emissions 1    
      8 - M/T Fed. models only.
  4.2L (258") 6-Cyl. PCV, TAC, EVAP, SPK 6 - Used on some Fed., Cherokee, Wagoneer & Truck models.
  5.9L (360") V8 PCV, TAC, AIS, EVAP, SPK  
  6.6L (401") V8 PCV, TAC, AIS, EVAP, SPK  
Light Duty Emissions: 
1966-77 vehicles up to 6000 GVW.
1978 California vehicles to 8500 GVW or Federal vehicles up to 6000 GVW.
1979-89 vehicles up to 8500 GVW.
Heavy Duty Emissions  :
1966-77 vehicles over 6000 GVW.
1978 California vehicles over 8500 GVW or Federal vehicles over 6000 GVW.
1979-89 vehicles over 8500 GVW.
AIS  - Air Injection System
ACV  - Air Control Valve
A-G  - Air Guard System (Air Injection-Jeep)
ASV  - Air Switch Valve
BPS  - Backpressure Sensor (EGR)
BPV  - By-Pass Valve
CCS  - Controlled Combustion System
CEC  - Computerized Emiss. Control
CP/EGR-SOL  - Canister Purge EGR Solenoid
CTO  - Coolant Temp. Override
DBC  - Dual Bed Converter
DC-VLV  - Deceleration Valve
DLV  - Delay Valve
DVTRV  - Diverter Valve
EAC  - Electric Assist Choke
EC  - Electric Choke
ECU  - Electronic Control Unit
EFE  - Early Fuel Evaporation
EGR  - Exhaust Gas Recirculation
EGR-CTO  - EGR Coolant Temp. Override
EGR-FDLV  - Exhaust Gas Recirc. Foward Delay Valve
EGR-TVS  - EGR Thermal Vac. Switch
EST  - Electronic Spark Control
EVAP  - Evap. Emission Control
FDV  - Foward Delay Valve
FR  - Fuel Return
FS  - Foward Spark
HDC  - Heavy Duty Cooling
HDC-CTO  - Heavy Duty Cooling Coolant Temp. Override
HDSP-CT  - Heavy Duty Spark Coolant Temp. Override
HDVA-CTO  - Heavy Duty Vac. Advance Coolant Temp. Override
MCU  - Micro Computer Unit
MCS  - Manifold Pressure Sensor
NLVR  - Non-Linear Vacuum Regulator
OC  - Oxidation Catalytic
PAIR  - Pulse-Air Injection
PCV  - Positive Crankcase Vent.
RS  - Reverse Spark
RDV  - Reverse Delay Valve
S-CTO  - Spark Coolant Temp. Override
SDV  - Spark Delay Valve
SL  - Solenoid
SLV  - Solevac
SP  - Spark
SPK  - Spark Control
TAC  - Thermostatic Air Cleaner
TCS  - Trans. Controlled Spark
TPS  - Throttle Position Sensor
TSD  - Throttle Solenoid
TVS  - Thermal Vacuum Switch
TVV  - Thermal Vacuum Valve
TWC  - Three-Way Catalyst
VA-CTO  - Vacuum Advance Coolant Temp. Override
VR  - Vacuum Reservoir
VR-CKV  - Vacuum Reverse Check Valve
VSA  - Vacuum Switch Assembly
VSD  - Vacuum Switch Dump
VTM  - Vacuum Throttle Modulator
scientia non olet · About LEMON Manuals