Air/Fuel Mixture: Testing and Inspection
Engine Tune-up Preparation1. Warm up the engine to the normal operating temperature.
2. Shift transaxle into Neutral (MTX) or P position (ATX).
3. Turn off all electrical loads.
^ Headlight
^ Blower
^ Rear window defroster
^ Power steering
4. Verify that the battery is fully charged.
5. Connect the SSTs (NGS tester) to the data link connector and select the "PID/DATA MONITOR AND RECORD" function and press TRIGGER.
6. Select "RPM" and press TRIGGER.
7. Wait until the electrical fan stops.
8. Select "START" to begin.
Idle Mixture Inspection
1. Perform "Engine Tune-up Preparation".
2. Verify that the idle speed and ignition timing are within the specification.
3. Insert an exhaust gas analyzer to the tailpipe.
4. Verify that the CO and HC concentrations are within the regulation.
^ If not, inspect the following.
a. On-board diagnostic system
b. Heated oxygen sensor (Front, Rear)
c. Intake manifold vacuum
d. Fuel line pressure
e. Ignition timing control
^ If the systems are normal, replace the three way catalytic converter.