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914 Exhaust Emissions Specifications

Reference source

Model

Idle speed RPM

CO% vol. max.

Regulatory Body and Testing Conditions

Emission label

S&T Manual

Factory Repair Manual

1971 1.7L

800-950

4.5%

EPA and California standard

X

1972 1.7L

850-900

4.0%

EPA and California standard

X

850-900

0.7%

Factory specification

X

X

1973 1.7L

800-950

3.0%

EPA and California standard

X

X

1973 2.0L

850-950

1.5%

EPA and California standard, Factory specification

X

X

X

1974 1.8L

800-900

4.5%

EPA and California standard

X

800-900

3.0%

Factory specification

X

1974 2.0L

850-950

3.0%

EPA and California standard

X

X

1975 1.8L

850-950

3.0%

USA standard and Factory specification

X

800-900

0.8%

California standard and Factory specification, measured before catalytic converter

X

800-900

0.4%

California standard and Factory specification, measured after catalytic converter

X

1975 2.0L

850-950

1.0%

USA standard and Factory specification (with air injection, without catalytic converter), CO 3% max measured at tailpipe with disconnected air pump hose, CO 1% max measured at tailpipe with air pump hose connected

X

850-950

0.4%

Factory specification, CO measured after catalytic converter

X

850-950

0.0%

California standard and Factory specification (with air injection and catalytic converter), CO 1-5% max measured before catalytic converter with air pump hose disconnected, CO 0% measured after catalytic converter with air pump hose connected

X

1976 2.0L

850-950

3.0%

EPA and California standard (with EGR, air injection and catalytic converter), CO measured before catalytic converter with disconnected air pump hose, PCV hose and carbon canister

X

X

850-950

0.4%

Factory specification, CO measured after catalytic converter

X

Notes:

1. Ignore the windshield emission label values. These are apparently a required label indicating factory compliance testing averages of the vehicle design which reference different measurements (grams per mile) than are useful today.

 

 

 

914 Emission control systems

Equipment

Pollutant reduction

1970

1971

1971

1972

1972

1973

1973

1973

1973

1974

1974

1974

1974

1975

1975

1975

1975

1976

1976

1.7L

1.7L USA

1.7L CA

1.7L USA

1.7L CA

1.7L USA

1.7L CA

2.0L USA

2.0L CA

1.8L USA

1.8L CA

2.0L USA

2.0L CA

1.8L USA

1.8L CA

2.0L USA

2.0L CA

2.0L USA

2.0L CA

Horsepower (DIN)

80

80

80

80

80

80

72

95

95

76

76

95

95

76

<76

88

<88

88

<88

Fuel Evaporation Control

Charcoal filter

HC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Positive Crankcase Ventilation

PCV+Anti-flashback valves

HC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Overrun Air Supply System

Deceleration valve

HC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Intake Air Preheat

Air filter box snorkle

HC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CO adjustability at ECU

ECU adjustment knob

CO

 

 

 

 

 

 

 

 

 

 

 

 

Modified exhaust, with thermal reactors

1975-76 exhaust system

HC, CO

 

 

 

 

 

 

Air Injection

Air pump and air injectors

CO, HC

 

 

 

 

Fuel cut-off on deceleration

ECU modification

HC

 

 

 

 

EGR

EGR valve

Nox

 

 

 

Catalytic converter

Catalytic converter

HC, CO, NOx

 

 

 

 

 

What are the Factory- specified emission control system maintenance requirements?

 

Model yrs Intervals Maintenance Item

1972-76 5K Check/adjust CO% at ECU to specification

1970-71 6K Check/clean PCV system valve/hoses

1970-76 10K Check charcoal filter hoses

1972-76 10K Check deceleration valve function

1975-76 15K Check air injection system- air pump, belt, filter

1972-74 20K Check/clean PCV system valve/hoses

1975-76 30K Check/clean PCV system valve/hoses

1975-76 30K or dash lights Check/clean EGR valve/tubing

1975-76 30K or dash lights Replace catalytic converter

1970-76 50K Replace charcoal filter

 

 

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