Cruise Control - Actuator Link Adjustment
Bulletin # 87-032Section: Product
Dated: 7/13/87
Subject:
CRUISE CONTROL ACTUATOR LINK
TO: ALL RANGE ROVER DEALERS
When performing repairs or adjustments to the cruise control actuator diaphragm or link, please check the following:
1. With the throttle fully closed, adjust the actuator link to provide 0.2 to 2.0 mm (0.008" to 0.080") clearance between the link and the groove on the throttle lever.
2. With the throttle fully open, ensure the a gap of at least 3 mm (1/8") exists between the side of the actuator link ("A" in illustration) and the top of the small spring which connects the inner throttle lever to the outer throttle lever ("B" in illustration). Realign the actuator link by bending to achieve the correct gap if it is less than 3 mm. Recheck the clearance at closed throttle/open throttle and check that the actuator link slides smoothly in the groove of the throttle lever.
In addition, should it be necessary to replace or adjust any of the throttle lever or throttle shaft components always perform the above checks before returning the vehicle to the customer.
If the above checks, repairs or adjustments do not solve the problem, the base idle speed should be adjusted.
Important:
All steps must be followed in sequence exactly as listed below. DO NOT attempt this procedure unless the basic throttle/timing/potentiometer adjustments have been made (see Workshop Manual Section 19).
With the engine at operating temperature and an accurate tachometer connected:
1. Center punch and drill (1/8" bit) the tamper proof plug located on the throttle housing. Remove the plug with a sheetmetal screw and pliers. Discard the plug and clean up any metal chips.
2. Switch the ignition on - DO NOT START THE VEHICLE.
3. Disconnect the stepper motor plug
4. Switch ignition off
5. Listen for click from EFI main relay (under the right front seat)
6. Reconnect the stepper motor plug
7. Switch the ignition on - DO NOT START THE VEHICLE
8. Disconnect the stepper motor plug
9. Start the vehicle in neutral without touching the accelerator
10. Adjust the base idle speed with a 3/16" Hex wrench to 550 to 650 RPM by turning the base idle screw. Turning counter clockwise will raise the speed and vice versa.
11. Reconnect stepper motor plug
12. Switch ignition OFF
13. WAIT for main relay click
14. Switch ignition on, start the engine and rev briefly to 2000 RPM
15. Idle speed should stabilize at 665-735 RPM
16. Install new tamper proof plug - Part Number ERC255