Idle Mixture Inspection
WARNING: This page is about a different car, the 2004 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Perform "Engine Tune-up Preparation".
- Verify that the idle speed and ignition timing are within the specification. (See IGNITION TIMING INSPECTION .)
- Insert an exhaust gas analyzer to the tailpipe.
- Verify that the CO and HC concentrations are within the specified limits.
- If not within the specified limits, inspected the following:
- On-board diagnostic system. (See ON-BOARD DIAGNOSTIC TEST .)
- HO2S. (See HEATED OXYGEN SENSOR (HO2S) INSPECTION .)
- Intake manifold vacuum. (See INTAKE MANIFOLD VACUUM INSPECTION .)
- Fuel line pressure. (See FUEL LINE PRESSURE INSPECTION .)
- Ignition timing control. (See IGNITION TIMING INSPECTION .)
- If the systems and devices are normal, replace the TWC. (See WARM-UP THREE-WAY CATALYTIC CONVERTER (WU-TWC) INSPECTION .)