Air/Fuel Mixture: Testing and Inspection
INSPECT CO/HCa. Start the engine.
b. Run the engine at 2,500 rpm for approximately 180 seconds.
c. Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.
d. Check CO/HC concentration at idle and/or 2,500 rpm.
HINT: When doing the 2 mode (with the engine is in the idle and 2,500 rpm) test, these measuring order are prescribed by the applicable local regulations.
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 repair the applicable causes if necessary.