17 Disconnect the injector wiring multiplug.
18 Undo the four screws securing the
injector housing to the throttle body, and lift
off the housing (see illustration). The housing
may be initially tight, due to the two locating
dowels. Recover the gasket from the throttle
body.
19 This is the limit of dismantling that can be
undertaken on the injector housing assembly.
Should it be necessary to renew the fuel
injector or fuel pressure regulator, a complete
injector housing assembly must be obtained.
20 Clean the mating faces of the injector
housing and throttle body, and remove all the
old locking compound from the threads of the
retaining screws. Obtain a new gasket if the
original shows any signs of deterioration.
Refitting
21 Place the gasket in position on the throttle
body, and locate the injector housing over the
gasket.
22 Apply a thread-locking compound to the
four retaining screws, then fit and tighten the
screws securely.
23 Reconnect the injector wiring multiplug.
24 Reconnect the two fuel hoses, then locate
the retaining clips 3.0 mm from the hose ends.
25 Refit the air cleaner air box, then adjust
the engine base idle speed as described in
Chapter 1.
Stepper motor unit
Removal
26 Remove the injector housing as previously
described.
27 Disconnect the wiring multiplug from the
side of the stepper motor.
28 Undo the four outermost screws that
secure the stepper motor to the throttle body
(see illustration). Do not remove the two
screws near the centre of the unit.
29 Lift off the accelerator cable support
bracket, with cable still attached, and place it
to one side.
30 Carefully lift off the stepper motor unit
and, where fitted, recover the gasket (see
illustration). Note that the gasket was only
fitted to early models, and if present, discard
it, and do not fit another on reassembly.
31 Clean the components with a clean cloth,
and remove all the old locking compound
from the threads of the retaining screws.
Refitting
32 Refitting is a reversal of removal, but use a
thread-locking compound on the retaining
screw threads.
Throttle body
Removal
33 Remove the injector housing as previously
described.
34 Disconnect the wiring multiplugs to the
stepper motor and throttle potentiometer.
35 Disconnect the two breather hoses on the
side of the throttle body (see illustration).
36 Slacken the accelerator cable locknuts,
open the throttle fully and slip the cable end
out of the throttle cam. Unscrew the lower
cable locknut fully, and remove the
accelerator cable from the support bracket.
37 On automatic transmission models,
disconnect the kickdown cable, using the
same procedure as for the accelerator cable.
38 Undo the four nuts securing the throttle
body to the manifold.
39 Lift off the throttle body, and recover the
manifold spacer, with gaskets.
40 Clean the mating faces on the manifold
and throttle body, and renew the gaskets on
the spacer if they show any sign of
deterioration. If the gaskets are being
renewed, attach them to the spacer using
non-drying jointing compound.
Refitting
41 Place the spacer with gaskets over the
manifold studs, then place the throttle body in
position. Secure the throttle body with the
four nuts tightened securely.
42 Reconnect the breather hoses and the
wiring multiplugs.
43 Refit the accelerator cable and adjust it,
by means of the locknuts, to give a small
amount of free play in the throttle-closed
position.
44 On automatic transmission models, refit
and adjust the kickdown cable as described in
Chapter 7, Part B.
45 Refit the injector housing as described
previously.
Electronic control unit (ECU)
Removal
46 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
47 Disconnect the wiring multiplug from the
ECU, which is located on the left-hand side of
the engine compartment behind the battery.
To do this, press the retaining tab upwards,
release the bottom of the multiplug, then
disengage the top lug (see illustration).
48 Disconnect the vacuum supply hose.
49 Undo the two retaining screws, disengage
the locating lug and remove the unit from its
mounting bracket.
Refitting
50 Refitting is a reversal of removal.
4A•8 Fuel and exhaust systems - single-point injection engines
12.47 Disconnect the ECU wiring
multiplug
12.35 Breather hose attachments at the
throttle body
12.30 . . . and lift off the stepper motor12.28 Undo the four stepper motor
retaining screws (arrowed) . . .
12.18 Injector housing retaining screws
(arrowed)
1380 Rover 800 Series Remake
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