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Home >> Honda >> 1998 >> Civic GX, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Idle Control System (GX) >> Idle Speed Setting

Idle Speed Setting

Adjust the idle speed using a Honda PGM Tester if possible. If not, use the following procedure:

NOTE:
  • Leave the IAC valve connected.
  • Before setting the idle speed, check the following items:
    • The MIL has not been reported on.
    • Ignition timing
    • Spark plugs
    • Air cleaner
    • PCV system
  1. Connect a tachometer.
  2. 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.
  3. Check the idle speed under no-load conditions: headlights, blower fan, rear defogger, radiator fan, and air conditioner are not operating.

    Idle speed should be:  700 +/- 50 RPM

    • If the idle speed is within the specification, the procedure is complete.
    • If the idle speed is out of specification, go to step 4.
  4. Remove the cap and turn the idle adjusting screw 1/2-turn clockwise or counterclockwise.
    Fig 1: Removing Cap & Turning Idle Adjusting Screw 1/2-Turn Clockwise
    G02510965Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. After turning the idle adjusting screw 1/2-turn, check the idle speed again. If it is out of spec, turn the idle adjusting screw 1/2-turn again.
    NOTE: Do not turn the idle adjusting screw more than 1/2-turn without checking the idle speed.
  6. Let the engine idle for one minute with heater fan switch at HI and air conditioner on, then check the idle speed.

    Idle speed should be:  830 +/- 50 RPM (in Park or neutral)

    If the idle speed is not within specification, see SYMPTOM CHART on .

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