1999 LAND ROVER DISCOVERY engine

ENGINE MANAGEMENT SYSTEM - V8
REPAIRS 18-2-93
6.Remove 4 bolts securing fuel rail to inlet
manifold.
7.Release injectors from inlet manifold and
remove fuel rail and injectors.
8.Release spring clips securing injectors to fuel
rail and remove fuel injectors.
9.Remove and discard 2 'O' rings from each
injector.
10.Fit protective caps to each end of injectors. Refit
1.Clean injectors and recesses in fuel rail and
inlet manifold.
2.Lubricate new 'O' rings with silicone grease
and fit to each end of injectors.
3.Fit injectors to fuel rail and secure with spring
clips.
4.Position fuel rail assembly and push-fit each
injector into inlet manifold.
5.Fit bolts securing fuel rail to inlet manifold and
tighten to 9 Nm (7 lbf.ft).
6.Connect fuel feed hose to fuel rail.
7.Connect injector harness multiplugs and
secure to fuel rail.
8.Carefully position ignition coil assembly
between inlet manifold and bulkhead.
9.Fit upper manifold.

+ MANIFOLDS AND EXHAUST
SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.

ENGINE MANAGEMENT SYSTEM - V8
18-2-94 REPAIRS
Actuator - cruise control
$% 19.75.05
Remove
1.Release clip and disconnect inner cable from
actuator.
2.Release outer cable from actuator mounting
bracket.
3.Release vacuum hose from actuator.
4.Remove nut, and remove actuator from
mounting bracket.
Refit
1.Position actuator and tighten retaining nut.
2.Connect vacuum hose to actuator.
3.Connect outer cable to mounting bracket.
4.Connect inner cable to actuator.
Vacuum control unit - up to 03MY
$% 19.75.06
Remove
1.Disconnect vacuum hose from actuator.
2.Disconnect multiplug from vacuum control unit.
3.Release 3 rubber mountings securing control
unit, and remove from mounting bracket.
4.Remove vacuum hose from control unit.
Refit
1.Position vacuum hose to control unit.
2.Position control unit and secure mountings.
3.Connect multiplug and vacuum hose.

ENGINE MANAGEMENT SYSTEM - V8
REPAIRS 18-2-95
Vacuum control unit - from 03MY
$% 19.75.06
Remove
1. If fitted: Remove 2 nuts securing heat shield
and remove heat shield.
2.Disconnect vacuum hose from actuator.3.Disconnect multiplug from control unit.
4.Release 3 rubber mounting securing control
unit to mounting bracket and remove control
unit.
Refit
1.Position control unit and secure mountings.
2.Connect multiplug and vacuum hose.
3. If fitted: Fit heat shield, fit nuts and tighten to
10 Nm (7 lbf.ft).

ENGINE MANAGEMENT SYSTEM - V8
18-2-96 REPAIRS
Cable - cruise control
$% 19.75.10
Remove
1.Release clip and disconnect inner cable from
actuator.
2.Release outer cable from actuator mounting
bracket.
3.Loosen cable locknuts, release outer cable
from abutment bracket and retaining clip.
4.Release inner cable from operating lever and
remove cable.
Refit
1.Position cable and connect to operating lever.
2.Position cable to abutment bracket.
3.Position outer cable to actuator mounting
bracket and connect inner cable to actuator.
4.Adjust cruise control cable.

+ ENGINE MANAGEMENT SYSTEM -
V8, ADJUSTMENTS, Cable - cruise control.
Switch - cruise control (on/off)
$% 19.75.30
Remove
1.Carefully remove switch from instrument cowl.
2.Disconnect multiplug and remove switch.
Refit
1.Position new switch and connect multiplug.
2.Carefully push switch into instrument cowl.

ENGINE MANAGEMENT SYSTEM - V8
REPAIRS 18-2-97
Switch - cruise control (set/resume)
$% 19.75.33
Remove
1.Remove the key from the starter switch.
Disconnect both battery leads, negative lead
first. Wait ten minutes before starting work.
2.Remove driver's airbag module.

+ RESTRAINT SYSTEMS, REPAIRS,
Airbag module - drivers.
3.Release remote control switches multiplug and
leads from steering wheel base.
4.Disconnect remote control switches multiplug
from harness.
5.Remove 2 screws securing remote control
switches to steering wheel base.
6.Release and remove remote control switches
from steering wheel.
Refit
1.Fit remote control switches to steering wheel
and secure with screws.
2.Connect remote control switches multiplug to
harness.
3.Secure leads and multiplug to base of steering
wheel.
4.Fit driver's airbag module.

+ RESTRAINT SYSTEMS, REPAIRS,
Airbag module - drivers.
Switch - clutch pedal - cruise control
$% 19.75.34
Remove
1.Remove 3 fasteners and move driver's side
lower closing panel aside.
2.Disconnect multiplug from clutch pedal switch.
3.Remove switch from pedal bracket.
Refit
1.Engage switch fully into pedal bracket location
and connect multiplug.
2.Position lower closing panel and secure with
fasteners.

ENGINE MANAGEMENT SYSTEM - V8
18-2-98 REPAIRS
ECU - Cruise control
$% 19.75.49
Remove
1.Remove fixings securing fascia RH closing
panel and remove panel.
2.Remove 2 fixings and remove 'A' post lower
trim.
3.Remove 2 nuts and remove ECU from studs.
4.Disconnect multiplug from ECU and remove
ECU.
Refit
1.Position new ECU and connect multiplug.
2.Fit ECU to studs and secure with nuts.
3.Fit lower trim panel to 'A' post and secure with
fixings.
4.Fit closing panel and secure with fixings.
5.Programme the ECU using TestBook.

FUEL DELIVERY SYSTEM - V8
DESCRIPTION AND OPERATION 19-2-1
FUEL DELIVERY SYST EM - V8 DESCRIPTION AND OPERAT ION
Fuel delivery system
1Fuel pressure regulator (hidden)
2Schraeder valve
3Fuel rail
4Injectors
5Engine block6Fuel feed pipe
7Coarse filter
8Fine filter
9Fuel pump and fuel gauge sender assembly

FUEL DELIVERY SYSTEM - V8
19-2-4 DESCRIPTION AND OPERATION
Description
General
The fuel delivery system comprises a fuel tank, fuel pump and regulator and eight injectors. The system is controlled
by the Engine Control Module (ECM) which energises the fuel pump relay and controls the operation and timing of
each injector solenoid.

+ ENGINE MANAGEMENT SYSTEM - V8, DESCRIPTION AND OPERATION, Description - engine
management.
The multiport fuel injection system is a returnless system with the fuel pressure maintained at a constant level by a
fuel pressure regulator. The regulator is located in the fuel pump housing and returns excess fuel directly from the
pump to the tank.
An electrically operated fuel pump is located in the top of the fuel tank and supplies fuel at pressure to two fuel rails
via a flexible hose. The hose is attached to the feed pipe on the fuel rail at the rear of the engine and the fuel pump
with sealed quick release couplings.
A moulded fuel tank is located at the rear underside of the vehicle between the chassis longitudinals. The tank
provides the attachment for the fuel pump and fuel gauge sender unit which is located inside the tank. The fuel system
is pressurised permanently with pressurised fuel vapour venting to an EVAP canister.

+ EMISSION CONTROL - V8, DESCRIPTION AND OPERATION, Emission Control Systems.
Fuel tank and breather
The fuel tank and breather system is a major part of the fuel delivery system. The fuel tank and breathers are located
at the rear of the vehicle between the chassis longitudinals.
Fuel tank
The moulded fuel tank is made from High Molecular Weight (HMW) High Density Polyethylene (HDPE). Continuous
layers of nylon additive are used during the moulding process. The nylon layers give an improved limit of fuel
permeation through the tank wall and are also resistant to alcohol based fuels used in the NAS market.
The tank is retained in position by a metal cradle which is secured to the chassis with two nut plates and bolts at the
rear and a stud plate and two nuts at the front. A strap above the tank is bolted to the chassis and restrains the tank
from moving upwards. The fuel tank has a useable capacity of approximately 95 litres (25 US Gallons).
An aperture in the top surface of the tank allows for the fitment of the fuel pump, regulator and fuel gauge sender unit
which is retained with a locking ring.
A reflective metallic covering is attached to the tank with two scrivets to shield the tank from heat generated by the
exhaust system.
The fuel filler is located in the right hand rear quarter panel, behind an access flap. The flap is opened electrically
using a switch on the fascia.
The filler is closed by a threaded plastic cap which screws into the filler neck. The cap has a ratchet mechanism to
prevent over tightening and seals against the filler neck to prevent the escape of fuel vapour. The filler cap has a valve
which relieves fuel pressure to atmosphere at approximately 0.12 to 0.13 bar (1.8 to 2.0 lbf.in
2) and opens in the
opposite direction at approximately 0.04 bar (0.7 lbf.in2) vacuum.
All markets except NAS: A moulded filler tube, made from HMW HDPE with no additional additives, connects the
filler to the tank via a flexible rubber hose. The filler tube is connected at its top end behind the filler flap.
NAS markets: A fabricated filler tube, made from stainless steel, connects the filler to the tank via a flexible rubber
hose. The filler tube is connected at it's top end behind the filler flap.
On all vehicles that use unleaded fuel, the filler neck is fitted with an inhibitor. The inhibitor is a tapered nozzle in the
mouth of the filler neck which will only allow the use of a standard unleaded fuel filler gun. A spring loaded flap valve
prevents the incorrect fuel from being trickle filled from an incorrect filler gun.