Air/Fuel Mixture: Testing and Inspection

INSPECT CO/HC

HINT: The ECM properly controls the CO/HC concentration in the emission gas.

a) Start and warm up the engine.
b) Run the engine at 2,500 rpm for approximately 180 seconds.
c) Insert the CO/HC meter testing probe at least 40 cm (1.3 ft.) into the tailpipe while idling.
d) Inspect the CO/HC concentration while idling and/or at 2,500 rpm.
If the CO/HC concentration is not as specified, perform troubleshooting in this order.
1) See the table for possible causes, and then inspect and repair the applicable causes if necessary.