Air/Fuel Mixture: Testing and Inspection
INSPECT CO/HCa. Start the engine.
b. Race engine at 2,500 r/min. for approximately 180 seconds.
c. Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into tailpipe during idling.
d. Immediately check CO/HC concentration at idle and/or 2,500 r/min.
HINT:
^ Complete the measuring within 3 minutes.
^ When doing the 2 mode (idle and 2,500 r/min) test, these measuring orders are prescribed by the applicable local regulations.
e. If the CO/HC concentration does not comply with regulations, troubleshoot in the order given.
1) Check heated oxygen sensor operation.
2) See the table for possible causes, and then inspect and correct the applicable causes if necessary.