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Idle Speed & Mixture

NOTE: Engine idle speed and mixture are controlled by ECM based on signals from various sensors and are not adjustable. Values given in IDLE SPEED & MIXTURE SPECIFICATIONS table are for verification purposes only. Always refer to SERVICE INFORMATION underhood label in engine compartment. If underhood label and lemon-25® manual specifications differ, always use underhood label specifications.
IDLE SPEED & MIXTURE SPECIFICATIONS

Application Specification
Base Idle Speed (1)
Discovery Series I
In Neutral With A/C Off 597-653
In Neutral With A/C On 672-728
Discovery Series II (2) 610-710 RPM
Range Rover (2) 660 RPM
CO @ Idle
Range Rover (3)
Discovery Series I & II 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) In Neutral with A/C off.
(3) Information not available from manufacturer.
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