Air/Fuel Mixture: Testing and Inspection
ENGINE TUNE-UPEngine Tune-up Preparation
1. Warm up the engine to normal operating temperature.
2. Shift the transaxle into neutral.
3. Turn off all electrical loads.
- Headlight
- Blower fan
- Rear window defroster
- A/C
4. Verify that the steering wheel is in the straight ahead position.
5. Connect the SST (NGS tester) to the DLC-2 and select "PID DATA MONITOR AND RECORD".
Idle Mixture Inspection
1. Perform "Engine Tune-up Preparation".
2. Verify that the idle speed and ignition timing are within the specification.
3. Warm up the engine by holding the engine speed at 2,500 - 3,000 rpm for approx. 3 minutes.
4. Insert an exhaust gas analyzer to the tailpipe.
5. Verify that the CO and HO concentrations are within the specified limits.
- If not within the specified limits, inspect the following:
- On-board diagnostic system
- HO2S
- Intake manifold vacuum
- Fuel line pressure
- Ignition timing control
- If the systems and devices are normal, replace the TWC.