Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSATURN2000SC2 AUTOMATIC, MP6REPAIR AND DIAGNOSISENGINE MECHANICALFUEL SYSTEMDIAGNOSTICSIDLE HC/CO CONCENTRATION CHECK
2000 Saturn SC2 Automatic, MP6
Idle HC/Co Concentration Check
2000 Saturn SC2 Automatic, MP6SECTION Idle HC/Co Concentration Check
NOTE:
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.
- Tachometer and HC/CO meter calibrated and in hand.
- Run engine at 2500 RPM for approximately 2 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 1 minute before measuring to allow the concentration to stabilize. Complete the measuring within 3 minutes. If the HC/CO concentration does not conform, see the following HC/CO diagnostic chart for possible causes. See Figure
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.