Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1997 Land Rover Defender 90 AutomaticFACTORY OEM SERVICE PROCEDURE
Idle Speed & Mixture
NOTE:
Engine idle speed and mixture are controlled by ECM based on signals from various sensors. Engine idle speed and mixture are not adjustable. Values given in IDLE SPEED & MIXTURE SPECIFICATIONS
are for verification purposes only. 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% | |||||
|
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Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.