10 Using a 32 mm spanner, unscrew the
stepper motor from the throttle housing.
Refitting
11 Refitting is a reversal of removal.
Throttle potentiometer
Removal
12 Disconnect the throttle potentiometer
wiring harness multiplug.
13 Using a dab of paint, mark the position of
the potentiometer in relation to the throttle
housing, so that if the original unit is refitted,
its position can be restored.
14 Undo the two screws, remove the unit
from the throttle housing, and recover the
gasket (see illustration 11.23).
Refitting
15 Refit the potentiometer and gasket, align
the previously-made mark, then tighten the
two retaining screws. If a new unit is being
fitted, position it centrally within its
adjustment range.
16 Adjust the base idle speed and mixture
settings as described in Section 11.
Throttle housing
Removal
17 Drain the cooling system as described in
Chapter 1.
18 Slacken the hose clip and detach the air
intake trunking from the throttle housing (see
illustration).
19 Disconnect the throttle potentiometer and
stepper motor wiring multiplugs.
20 Disconnect the air valve hose from the top
of the housing, and the breather hose from
below.
21 Slacken the clips and disconnect the two
coolant hoses from the housing.
22 Open the throttle fully by hand, and slip
the accelerator inner cable end out of the slot
on the throttle lever.
23 Slacken the outer cable locknuts, and
unscrew the outer locknut, nearest to the
cable end, fully.
24 Remove the washer and rubber bush,
then withdraw the accelerator cable from the
support bracket.
25 On automatic transmission models,
disconnect the kickdown cable using the
same procedure as for the accelerator cable.
26 Undo the four retaining nuts and remove
the throttle housing from its mounting.
27 If further dismantling is required, the
stepper motor and throttle potentiometer can
be removed, as described earlier in this
Section.
Refitting
28 Refitting is a reversal of removal. Refill the
cooling system as described in Chapter 1
and, on automatic transmission models,
adjust the kickdown cable as described in
Chapter 7, Part B. Adjust the base idle speed
and mixture settings as described in Sec-
tion 11 on completion.
Fuel temperature switch
Removal
29 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
30 Disconnect the wiring multiplug from the
temperature switch, located in the centre of
the fuel rail behind the plenum chamber (see
illustration).
31 Unscrew the switch and remove it from
the fuel rail.
Refitting
32 Refitting is a reversal of removal.
Plenum chamber
Removal
33 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
34 Slacken the hose clip and detach
the air intake trunking from the throttle
housing.
35 Undo the four nuts securing the throttle
housing to the plenum
chamber, ease the housing off the studs, and
move it slightly to one side.
36 Disconnect the two vacuum hoses at the
throttle housing end of the plenum chamber
(see illustration).
37 At the other end of the plenum chamber,
unscrew the brake servo vacuum hose banjo
union bolt, disconnect the vacuum hose
adjacent to the banjo union, and undo the fuel
pressure regulator mounting bracket bolt (see
illustration). Recover the two copper washers
from the banjo union, and note that the hose
locates between two locating pegs in its fitted
position.
38 Remove the fuel temperature switch as
described previously.
39 Undo the two bolts securing the plenum
chamber mounting brackets to the camshaft
cover (see illustration).
40 Undo the six bolts securing the rear of the
4B•6 Fuel and exhaust systems - Lucas multi-point injection engines
12.39 Plenum chamber mounting bracket
to camshaft cover bolt (arrowed)
12.37 Brake servo vacuum hose banjo
union (A), additional vacuum hose (B), and
fuel pressure regulator mounting bracket
bolt (C)
12.36 Vacuum hose connections at the
throttle housing end of the plenum
chamber
12.30 Fuel temperature switch wiring
multiplug
12.18 Air intake trunking retaining clip (A),
air valve hose (B), and throttle housing
upper retaining nuts (C)
1380 Rover 800 Series Remake
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