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Idle Mixture Ratio Adjustment: Preparation

WARNING: This page is about a different car, the 2005 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. Make sure that the following parts are in good order.
    • Battery
    • Ignition system
    • Engine oil and coolant levels
    • Fuses
    • ECM harness connector
    • Vacuum hoses
    • Air intake system

      (Oil filler cap, oil level gauge, etc.)

    • Fuel pressure
    • Engine compression
    • Throttle valve
    • Evaporative emission system
  2. On air conditioner equipped models, checks should be carried out while the air conditioner is OFF.
  3. Checks should be carried out while selector lever is in P or N position.
  4. When measuring CO percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
  5. Turn off headlamp, heater blower, rear window defogger.
  6. Keep front wheels pointed straight ahead.
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