Emission Control Systems: Testing and Inspection
InspectionWARNING: Do not smoke during this procedure. Keep any open flame away from your work area.
1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
2. Connect a tachometer.
3. Check and, if necessary, adjust the idle speed.
4. Warm up and calibrate the CO meter according to the meter manufacturer's instructions.
5. Check idle CO with the headlights, heater blower, rear window defogger, cooling fan, and air conditioner off.
NOTE: (Canada) Pull the parking brake lever up. Start the engine, then check that the headlights are off.
CO meter should indicate 0.1% maximum.
NOTE: '98 D16Y5 engine - If the idle speed increases to 810 ± 50 rpm, this means the EVAP system is purging the canister. To stop the purging temporarily, raise the engine speed above 1,000 rpm with the accelerator pedal, then slowly release the pedal.