Idle Speed & Ignition Timing

Ensure idle speed and ignition timing are set to specification. See IDLE SPEED SPECIFICATIONS and IGNITION TIMING tables. For adjustment procedures, see ADJUSTMENTS article in the ENGINE PERFORMANCE Section.

IDLE SPEED SPECIFICATIONS

Application

RPM

Prelude ⁽¹⁾

500-600

⁽¹⁾	With Electronic Air Control Valve (EACV) disconnected, headlights and cooling fan off and transmission in Neutral or Park.

IGNITION TIMING (Degrees BTDC @ RPM)

Application

⁽¹⁾ Specification

Prelude

13-17 @ 650-750

⁽¹⁾	Ignition timing is controlled by the Engine Control Module (ECM) and cannot be adjusted.