2004 Honda Odyssey LXFACTORY OEM SERVICE PROCEDURE

Idle Speed Adjustment

Adjust the idle speed using the HDS procedure, if possible. If not, use the following procedure:

NOTE:
  • Leave the IAC valve connected.
  • Before setting the idle speed, check these items:
    • The MIL has not been reported on.
    • Ignition timing
    • Throttle cable adjustment
    • Spark plugs
    • Air cleaner
    • PCV system
    • No vacuum leaks
  • On Canadian models, press the parking brake pedal. Start the engine, then check that the headlights are off.
  1. Disconnect the EVAP canister purge valve 2P connector.
  2. Connect a tachometer.
  3. 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.
  4. Check the idle speed with no-load conditions: headlights, blower fan, rear window defogger, radiator fan, and air conditioner off.

    Idle speed should be: 

    1. '99-01 models: 730+/-50 rpm (in Park or neutral)
    2. '02-04 models: 710+/-10 rpm (in Park or neutral)
  5. Adjust the idle speed, if necessary, by turning the idle adjusting screw (A) 1/4-turn clockwise or counterclockwise.
    NOTE: Do not turn the idle adjusting screw more than 1/4-turn without checking the idle speed.
Factory Service Tools

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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.