Idle Mixture

NOTE: Idle mixture is controlled by GEMS through the ECM. Mixture is not adjustable, but should be checked as part of normal tune-up procedure using an exhaust gas analyzer. If vehicle exhaust emissions are not within specifications, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Always refer to SERVICE INFORMATION underhood label in engine compartment. If underhood label differs from these specifications, always use underhood label specifications.

IDLE SPEED & MIXTURE SPECIFICATIONS

Application

Specification

Base Idle Speed ⁽¹⁾

680-720 RPM

CO @ Idle

Discovery

⁽²⁾

Defender 90

Less Than 0.5%

⁽¹⁾	Idle speed is controlled by ECM through Idle Air Control (IAC) valve. With engine at normal operating temperature, IAC valve should be set to 20-25 steps.

⁽²⁾	Information not available.