Honda CRX silhouetteCRX

Engine Tune-up — Idle Speed Inspection/Adjustment

5-10prose procedure

Idle speeds vary by engine and market: KQ/SOHC with CATA 750 rpm, KY 780 rpm, DOHC except KQ 800 rpm; with electrical/A/C loads SOHC and KQ 780 rpm, DOHC except KQ 800 rpm.

Idle Speed Inspection/Adjustment

  1. 1
    Start the engine and warm it up to normal operating temperature (the cooling fan comes on).
  2. 2
    Connect a tachometer.
    Tachometer hookup showing the TACHOMETER connected to the battery and the RPM CONNECTING ADAPTER (07JAZ-SH20100) attached to the engine harness.
  3. 3
    Disconnect the 2P connector from the EACV.
    Engine bay view locating the EACV (Electronic Air Control Valve) and its 2P connector.
  4. 4
    Check idling in no-load conditions in which the headlights, blower fan, rear defogger, cooling fan, and air conditioner are not operating. Idle speed should be: 650 ± 50 min⁻¹ (rpm). Adjust the idle speed, if necessary, by turning the idle adjusting screw.
    If the idle speed is excessively high, check the throttle control system (page 6-86).
    Throttle body close-up showing the location of the IDLE ADJUSTING SCREW.
  5. 5
    Reconnect the 2P connector on the EACV, then remove HAZARD fuse in the main fuse box for 10 seconds to reset ECU.
  6. 6
    Idle the engine with no-load conditions in which the headlights, blower fan, rear defogger, cooling fan, and air conditioner are not operating for one minute, then check the idle speed.
  7. 7
    Idle the engine for one minute with headlights (Hi) and rear defogger ON and check the idle speed. Idle Speed should be:
  8. 8
    Idle the engine for one minute with heater fan switch at HI (right end) and air conditioner on, then check the idle speed. Idle Speed should be:
    If the idle speed is not within specifications, see System Troubleshooting Guide on page 6-59.
Step 6 — KQ, SOHC with CATA
750 ± 50 min⁻¹ (rpm)rpm
Step 6 — KY
780 ± 50 min⁻¹ (rpm)rpm
Step 6 — DOHC Ex. KQ
800 ± 50 min⁻¹ (rpm)rpm
Step 7 — KQ, SOHC with CATA
750 ± 50 min⁻¹ (rpm)rpm
Step 7 — KY
780 ± 50 min⁻¹ (rpm)rpm
Step 7 — DOHC Ex. KQ
800 ± 50 min⁻¹ (rpm)rpm
Step 8 — SOHC and KQ
780 ± 50 min⁻¹ (rpm)rpm
Step 8 — DOHC Ex. KQ
800 ± 50 min⁻¹ (rpm)rpm
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