High Emission Levels

Emissions Diagnostic Chart.:

IDLE HC/CO CONCENTRATION CHECK

NOTE: This check is used only to determine whether or not the idle HC/CO complies with regulations.

PRE-TEST CONDITIONS:

^ Engine must reach normal operating temperature.

^ Air cleaner installed,

^ All pipes and hoses of air induction system connected.

^ All vacuum lines properly connected.

^ All fuel system wiring connections fully plugged.

^ Transmission in P (Park) or N (Neutral) range.

^ Tachometer and HC/CO meter calibrated and in hand.

TESTING


^ Run engine at 2,500 rpm for approximately two minutes.

^ Insert HC/CO meter testing probe into intermediate pipe at least 40 cm (16 in.).

^ Check HC/CO concentration at idle.

NOTE: Wait at least one minute before measuring to allow the concentration to stabilize. Complete the measuring within three minutes. If the HC/CO concentration does not conform to regulations, see the HC/CO diagnostic chart for possible causes.