LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 236 (Engine Control System) >> Basic Service Procedure >> Idle Mixture Ratio Adjustment >> Preparation
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Idle Mixture Ratio Adjustment: Preparation

WARNING: This page is about a different car, the 2005 Nissan Quest. 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
    • EGR volume control valve operation
    • Throttle valve
    • Evaporative emission system
  2. On air conditioner equipped models, checks should be carried out while the air conditioner is OFF.
  3. On automatic transmission equipped models, when checking idle RPM, ignition timing and mixture ratio, checks should be carried out while shift lever is in 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.
  7. Make the check after the cooling fans have stopped.
scientia non olet · About LEMON Manuals