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|West Coast British -
Blvd., Livermore, CA. 94551. Phone 925-606-8301/Fax 925-606-8302
Date: July 31, 1987
Subject: Base Idle Setting
Vehicle: Range Rover 1987 & ’88 Model
Required Equipment: Service Manual, 3/16 hex Allen, Lucas Handheld
Route idle adjustment during maintenance is not necessary. The bypass air
valve (stepper motor) located at the rear of the plenum chamber. This
receives signals from the EFI’s ECU and automatically corrects the hot idle
speed. Idle range is 665-735 rpm. The use of A/C will raise the idle speed.
Owners complaints of “surging”, “excessive high or low”, or even
“hesitation” can be traced to one of the following:
A) Incorrect throttle plate/lever position.
B) Throttle potentiometer adjust (on the early cars it was adjustable,
replacement unit is not).
C) Incorrect throttle cable adjustment.
D) Defective/disconnected road speed transducer.
E) Ignition Timing (or failed Vacuum Advance and/or seized Mechanical
F) Vacuum Leak(s).
G) Fuel pressure (filter clogged or pump failure).
H) Crankcase venting (dipstick o-ring failed, or oil filler cap and/or vent
I) Defective Stepper Motor.
J) Carbon build up in throttle housing, breather hoses, etc.
K) Poor engine condition (compression low, valve hung open from carbon or
bent, flat camshaft, etc).
If all else fails, Base Idle should be re-set EXACTLY as shown. RRNA (LRNA)
warns. “DO NOT attempt this procedure unless the basic
throttle/timing/potentiometer adjustments have been made (see Workshop
Manual Section 19)”.
1) Engine must be at full operating temperature.
2) Remove the blanking plug located on the throttle housing (punch 1/8” hole
and use a sheet metal screw to remove plug).
3) Switch ignition ON – DO NOT START ENGINE.
4) Disconnect Stepper Motor.
5) Switch Ignition OFF.
6) Listen for EFI Relay to click (it’s under passenger seat).
7) Reconnect Stepper Motor.
8) Switch Ignition ON – DO NOT START ENGINE.
9) Disconnect Stepper Motor.
10) Start ENGINE in neutral (without touch throttle).
11) Adjust IDLE using the 3/16” Allen Hex to 550-650 rpm (turn counter
clockwise to INCREASE idle).
12) Reconnect Stepper Motor.
13) Switch Ignition OFF.
14) Listen for EFI Rely to click.
15) Start ENGINE and Rev briefly to 2000 rpm.
16) Idle should stabilize at 665-735 rpm.
17) Fit new tamper proof plug (Part# ERC255).
Originally issued by: Service
Department, Range Rover of North America Inc. 4390 Parliament Place, P.O.
Box 1503, Lanham, Maryland. 20706. On July 6, 1987, Bulletin# 87-033,
Technical Bulletin main page