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Home >> Saturn >> 2002 >> LW100 L4-2.2L VIN F >> Repair and Diagnosis >> Powertrain Management >> Emission Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Idle HC/CO Concentration Check
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Idle HC/CO Concentration Check

IMPORTANT: This check is used only to assist with idle HC/CO Diagnostics.

^ Initial 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.
- HC/CO meter calibrated and in hand.
^ Run engine at 2500 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.

IMPORTANT: Wait at least 1 minute before measuring to allow concentration to stabilize. Complete measuring within 3 minutes. If HC/CO concentration does not conform, see the following HC/CO diagnostic chart for possible causes.
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