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.

Disconnect the EVAP canister purge valve 2P connector.
Connect a tachometer.
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.
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)
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.

Fig 1: Adjusting The Idle Speed By Turning The Idle Adjusting Screw 1/4-turn Clockwise Or Counterclockwise
Courtesy of AMERICAN HONDA MOTOR CO., INC.
After turning the idle adjusting screw 1/4-turn, check the idle speed again. If it is out of spec, turn the idle adjusting screw 1/4-turn again.
Allow the engine to idle for 1 minute with the heater fan switch at HI and air conditioner on, then check the idle speed.
Idle speed should be:
1. '99-01 models: 730+/-50 rpm (in Park or neutral)
2. '02-04 models: 710+/-50 rpm (in Park or neutral)
NOTE:
- Do not turn the idle adjusting screw when the air conditioner is on.
- If the idle speed is not within specification, see the SYMPTOM TROUBLESHOOTING INDEX .
Reconnect the EVAP canister purge valve 2P connector.