1979 Models/With Oxygen Sensor
- With engine at normal operating temperature, turn headlights on high beam and turn air conditioning off (if equipped). Disconnect and plug crankcase breather hose at cylinder head.
- Also disconnect hose between charcoal canister and air cleaner. Check and adjust ignition timing as necessary. Adjust idle speed to specified RPM using adjusting screw on side of throttle valve housing.
- Remove cap from CO test receptacle on exhaust manifold and connect CO tester hose directly to test receptacle. Connect a dwell meter to frequency valve electrical connector. Zero dwell meter and set it to the 4-cylinder scale.
- Disconnect oxygen sensor wire at connector and check dwell meter reading. Meter reading must be constant between 40-50 degrees. Adjust CO level to specifications using Mixture Adjustment Wrench (P 377). Turn adjustment wrench clockwise to increase CO% level and counterclockwise to decrease CO% level.
- Reconnect oxygen sensor wire and check dwell meter reading. Meter reading should now pulsate. Reconnect all hoses, then recheck idle speed and adjust if necessary.
NOTE:
Do not press down on mixture adjustment wrench when adjusting CO level. Also, do not accelerate engine with wrench in place. Remove wrench after each adjustment and accelerate engine briefly before reading CO% level. Always adjust CO% level from lean to rich.
IDLE SPEED & CO% LEVEL SPECIFICATIONS
| Application | Idle RPM | CO% | |||
|---|---|---|---|---|---|
| Gasoline Models | |||||
| Federal | 850-1000 | 0.9 Max. | |||
| Calif. | 850-1000 | (1) 0.3 Max. | |||
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