1995 LAND ROVER DISCOVERY Workshop Manual

19FUEL SYSTEM
6
REPAIR 15.Disconnect hose, plug return hose and rail.
Remove cloth.
16.Remove 6 nuts securing fuel rail and ignition coil
bracket to inlet manifold.
17.Release ignition coil bracket from inlet manifold
studs. Place aside.
18.Release fuel rail and injectors from inlet
manifold.
Do not carry out further dismantling if component
is removed for access only.
19.Remove fuel rail and injectors.
20.Remove 2 bolts securing fuel pressure regulator
to fuel rail.
21.Remove pressure regulator assembly.
22.Remove 'O' ring from fuel pressure regulator and
discard.
23.Remove 8 clips securing injectors to fuel rail.
24.Remove injectors from fuel rail.
25.Remove 2 'O' rings from each injector and
discard.Refit
26.Ensure mating surfaces between inlet manifold
and ram pipe housing are clean.
27.Ensure all locations in fuel rail and inlet manifold
are clean.
28.Lubricate and fit new 'O' rings to injectors and
fuel pressure regulator.
29.Fit fuel pressure regulator to fuel rail. Secure
with bolts. Tighten to
10 Nm.
30.Fit injectors to fuel rail. Secure with clips.
31.Position fuel rail to inlet manifold. Engage
injectors, one bank at a time.
32.Position ignition coil bracket on inlet manifold
studs.
33.Secure ignition coil bracket and fuel rail to inlet
manifold with nuts. Tighten to
8 Nm.
34.Remove plugs from fuel feed and return pipes
and rail.
35.Connect hose and tighten clip.
36.Clean feed pipe union and connect fuel feed
pipe to fuel rail. Tighten union to
16 Nm.
37.Connect multiplugs to fuel injectors and fuel
temperature sensor.
38.Remove cloth from inlet manifold.
39.Apply a thin, uniform coating of Loctite 577
sealant to mating face of inlet manifold.
40.Fit ram housing to inlet manifold. Secure with
bolts. Tighten to
24 Nm.
41.Connect purge hose, crankcase breather hose,
servo and pressure regulator vacuum hoses to
ram housing.
42.Fit plenum chamber.
See Plenum Chamber
43.Reconnect battery negative lead.
44.Start engine. Check for leaks around fuel rail and
injectors.

SFI
7
REPAIR FUEL TEMPERATURE SENSOR
Service repair no - 19.22.08
Remove
NOTE: Because fuel leakage will not occur
when sensor is removed, it is not
necessary to depressurise the fuel system
for this operation.
1.Disconnect battery negative lead.
2.Disconnect multiplug from fuel temperature
sensor.
3.Remove sensor from fuel rail.
Refit
4.Ensure sensor and location in fuel rail are clean.
5.Fit sensor. Tighten to
17 Nm.
6.Connect multiplug.
7.Reconnect battery negative lead.

19FUEL SYSTEM
8
REPAIR IGNITION COILS
Service repair no - 18.20.45 - Set
Service repair no - 18.20.43 - Each
Service repair no - 18.20.44 - Extra - Each
Remove
1.Disconnect battery negative lead.
2.Disconnect H.T. leads from ignition coils. Note
positions of leads.
3.Place H.T. leads aside.
4.Disconnect ignition coil multiplug.
5.Remove 4 nuts securing coil bracket.
6.Release ignition coil bracket from inlet manifold
studs.
7.Manoeuvre coil/bracket assembly from behind
plenum chamber and remove.
8.Remove terminal cover. Note lead positions.
9.Remove 2 nuts securing leads to coil terminals.
10.Remove leads from terminals.
11.Remove 3 Torx screws securing ignition coil to
bracket and remove coil.Refit
12.Fit ignition coil to bracket. Secure with screws.
13.Connect leads to terminals. Secure with nuts.
14.Fit terminal cover.
15.Position ignition coil bracket on inlet manifold
studs.
16.Secure fuel rail and ignition coil bracket with
nuts. Tighten to
8 Nm.
17.Connect multiplug.
18.Connect H.T. leads to respective coil towers.
19.Reconnect battery negative lead.

SFI
9
REPAIR INTAKE AIR TEMPERATURE SENSOR (IAT
SENSOR)
Service repair no - 18.30.09
Remove
1.Disconnect multiplug from IAT sensor.
2.Remove IAT sensor from air cleaner.
Refit
3.Clean sensor and mating face.
4.Fit IAT sensor. Tighten to
8 Nm.
5.Connect multiplug.THROTTLE POSITION SENSOR (TP SENSOR)
Service repair no - 19.22.49
Remove
1.Disconnect multiplug from TP sensor.
2.Remove 2 Torx screws securing TP sensor.
Collect clamp plate.
3.Remove TP sensor.
Refit
4.Clean mating faces.
5.Fit TP sensor. Ensure drive engages correctly
with throttle spindle.
6.Position clamp plate. Secure TP sensor with
Torx screws. Tighten to
2 Nm.
7.Connect multiplug.

19FUEL SYSTEM
10
REPAIR KNOCK SENSOR
Service repair no - 18.30.28 - Sensor - LH
Service repair no - 18.30.30 - Sensor - RH
CAUTION: Due to the sensitivity of the
sensors, do not apply tape or sealant to
sensor threads.
Remove
1.Raise vehicle on ramp.
2. RH Sensor only:Remove bolt securing starter
motor heatshield to RH engine mounting.
3.Release heatshield clip from starter solenoid.
4.Move heatshield aside for access to knock
sensor.
5. Both sensors:
Disconnect sensor multiplug.
6.Remove sensor.
Refit
7.Clean sensor and mating face.
8.Fit sensor. Tighten to
16 Nm.
9.Connect sensor multiplug.
10. RH Sensor only:Manoeuvre heatshield into
position.
11.Secure clip to solenoid.
12.Align bracket to mounting and fit bolt. Fit and
tighten bolt.
13.Lower ramp.
CAUTION: Failure to tighten sensor to
correct torque will result in malfunction or
sensor damage.

SFI
11
REPAIR FUEL PRESSURE REGULATOR
Service repair no - 19.45.06
Remove
1.Disconnect battery negative lead.
2.Depressurise fuel system.
See Fuel System -
Depressurise
3.Position cloth over fuel feed union, slacken union
to release fuel pressure, then re-tighten union.
4.Release fuel return hose clip. Remove fuel
return hose from regulator connecting pipe.
5.Plug connections.
6.Remove 4 nuts ignition coil bracket to inlet
manifold.
7.Release ignition coil bracket from inlet manifold
studs and place aside.
8.Release regulator connecting pipe from clip.
9.Disconnect vacuum hose from fuel pressure
regulator.
10.Remove 2 bolts securing fuel pressure regulator
to fuel rail.
11.Remove fuel pressure regulator assembly.
12.Remove 'O' ring and spacer ring from fuel
pressure regulator. Discard 'O' ring.
13.Release clip and remove connecting pipe from
regulator.
14.Fit plugs to regulator and rail.

19FUEL SYSTEM
12
REPAIR Refit
15.Ensure locations on fuel pressure regulator and
fuel rail are clean.
16.Fit new spacer ring and 'O' ring to fuel pressure
regulator. Lubricate 'O' ring with silicone grease.
17.Fit pressure regulator assembly to fuel rail.
18.Secure regulator connecting pipe in clip.
19.Secure with bolts. Tighten to
10 Nm.
20.Align ignition coil bracket to inlet manifold studs.
21.Secure ignition coil bracket and fuel rail to inlet
manifold with nuts. Tighten to
8 Nm.
22.Remove plugs.
23.Connect return pipe to regulator connecting pipe.
Secure with clip.
24.Connect vacuum hose to fuel pressure regulator.
25.Remove cloth.
26.Reconnect battery negative lead.
27.Start engine. Check for leaks around fuel
pressure regulator, fuel feed and fuel return
unions.IDLE AIR CONTROL (IAC)
Service repair no - 19.22.54
Remove
1.Disconnect battery negative lead.
2.Disconnect IAC multiplug.
3.Remove 2 bolts securing IAC to plenum.
4.Remove IAC.
5.Remove gasket and discard.
Refit
6.Ensure all mating faces are clean.
7.Using a new gasket, fit IAC to plenum. Secure
with bolts. Tighten to
2.3 Nm.
8.Connect multiplug.
9.Reconnect battery negative lead.

SFI
13
REPAIR PLENUM CHAMBER
Service repair no - 19.22.46
Remove
1.Disconnect battery negative lead.
2.Slacken clip securing intake hose to plenum
chamber and release hose.
3.Remove split pin from throttle cable clevis pin.
4.Remove clevis pin.
5.Release and remove kick down cable clevis pin.
6.Disconnect vacuum hose from cruise actuator.
7.Release throttle cable from abutment bracket.
8.Remove front locknut from kick down cable.9.Release cable from bracket.
10.Disconnect breather hose from plenum.
11.Release clip and disconnect multiplug from
throttle position sensor (TP Sensor).
12.Disconnect multiplug from idle air control (IAC).
13.Remove 6 bolts securing plenum chamber.
14.Release plenum chamber from ram pipe
housing.
15.Fit approved hose clamp to water jacket coolant
hoses.
16.Tighten clamp.
17.Position cloth to absorb coolant spillage.
Do not carry out further dismantling if
component is removed for access only.
18.Slacken clips securing coolant hoses to plenum.