Range Rover 3.5 Litre (non cat) diagnostic checklist symptom 2
ENGINE IDLE SPEED HUNTS (sometimes stalls) DURING WARM UP OR WHEN HOT - vehicle can actually rock. CO can be very low and unadjustable.
2a. Physically check throttle sensor rotation (should be perfectly smooth). Check output voltage at idle - should be between .3V and .36V. Adjust if necessary.
2b. ALWAYS REPLACE water temperature sensor - the one behind the easy one!
2c. If above check out OK then ECU is faulty.
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