INSPECTION
HINT
This check is used only to determine whether or not the idle CO/HC complies with specifications.
Scheme 27
Scheme 28
- INITIAL CONDITIONS Engine at normal operating temperature Air cleaner installed Air pipes and hoses of air induction system connected All accessories switched OFF All vacuum lines properly connected SFI system wiring connectors fully plugged Ignition timing check correctly Transmission in neutral position Tachometer and CO/HC meter calibrated by hand
- START ENGINE
- RACE ENGINE AT 2,500 RPM FOR APPROX. 180 SECONDS
- INSERT CO/HC METER TESTING PROBE AT LEAST 40 cm (1.3 ft) INTO TAILPIPE DURING IDLING
- IMMEDIATELY CHECK CO/HC CONCENTRATION AT IDLE AND/OR 2,500 RPM Complete the measuring within 3 minutes. HINT: When performing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations. If the CO/HC concentration does not conform to specifications, perform troubleshooting in the order given below. Check the A/F sensor operation (see «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-180979-S04551230812005073000000) ). (Scheme 28)for possible causes, and then inspect and correct the applicable causes if necessary.
HINT
If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
Scheme 29
- WARM UP AND STOP ENGINE Allow the engine to warm up to normal operating temperature.
- REMOVE IGNITION COILS (See «IGNITION COIL»(ref-209172-S26715258122005120900000) )
- REMOVE SPARK PLUGS
- INSPECT CYLINDER COMPRESSION PRESSURE Insert a compression gauge into the spark plug hole. Fully open the throttle. While cranking the engine, measure the compression pressure. HINT: Always use a fully charged battery to obtain engine speed of 250 rpm or more. Repeat steps ( a ) through ( c ) for each cylinder. NOTE: This measurement must be done in as short a time as possible. Compression pressure: 1.300 kPa (13.8 kgf/cm 2 , 196 psi) Minimum pressure: 1.00 MPa (10 kgf/cm 2 , 142 psi) Difference between each cylinder: 100 kPa (1.0 kgf/cm 2 , 14 psi) If the cylinder compression in one more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps a ) through ( c ) for cylinders with low compression. If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage through the gasket.
- REINSTALL SPARK PLUGS
- REINSTALL IGNITION COILS (See «IGNITION COIL»(ref-209172-S26715258122005120900000) )