Specialists in Land Rover Parts & Accessories Since 1970 Range RoverRange Rover SportDiscoveryLR3LR4EvoqueFreelanderLR2DefenderSeries

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Over 11,000 Parts In Stock!

From floor mats to filters to complete engines, we carry the widest range of parts and accessories for your Land Rover you will find anywhere!

...And the important word here is stock. We simply don't list part #'s that we can buy - we stock them. We operate over 50,000 square feet of warehouse space at two warehouse locations on both the East and West coast.

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We ship same-day on orders placed before 12:00pm eastern time, Monday - Friday (excluding holidays) from both our East and West Coast Warehouses.

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Atlantic British strives to bring you the BEST QUALITY parts at the BEST PRICE!

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Quality & Service

Since 1970, we've helped more Land Rover owners enhance, modify or repair their vehicle than any other independent parts specialist. Quality products, superior service and a wealth of happy customers are the keys to our success. Getting you what you need, efficiently and effectively - it's what we do.

We appreciate your business - buy with confidence!

Rover Resources Center

Base Idle Setting Procedure

Applies To:

Range Rover Classic | '87-'88

Routine idle speed adjustment during maintenance services is not necessary nor desired. If your idling speed is off, it is often the result of another problem. The bypass air valve (stepper motor) located at the rear of the plenum chamber receives signals from the EFI's electronic control unit and automatically corrects hot idle speed within a range of 665-735 RPM. Use of air conditioning will raise the idle speed slightly above the normal range. This is acceptable.

Problems such as idle surge, excessively high or low idle or off idle hesitation can usually be traced to one or more of the following:

Use the Workshop Manual, Lucas handheld tester and other shop diagnostic equipment to isolate and correct any of the above problems.

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.
  2. Remove the plug with a sheet metal screw and pliers.
  3. Discard the plug and clean up any metal chips.
  4. Switch the ignition on - DO NOT START THE VEHICLE.
  5. Disconnect the stepper motor plug.
  6. Switch ignition off.
  7. Listen for click from EFI main relay (under the right front seat).
  8. Reconnect the stepper motor plug.
  9. Switch the ignition on - DO NOT START THE VEHICLE.
  10. Disconnect the stepper motor plug.
  11. Start the vehicle in neutral without touching the accelerator.
  12. 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.
  13. Reconnect stepper motor plug.
  14. Switch ignition off.
  15. WAIT for main relay click.
  16. Switch ignition on, start the engine and rev briefly to 2000 RPM.
  17. Idle speed should stabilize at 665-735 RPM.
  18. Install new tamper proof plug.

Complete Tech Tips List Page

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