
Central Injection Unit
Removal and refitting
Select the neutral position of the gearchange lever and apply
the handbrake.
Since, after the engine is stalled, fuel remains under pres-
sure, always depressurize the fuel system. To do this, disconnect
the fuel pump wiring plug from the injection wiring harness. Start
the engine and run it until it cuts off. Operate the starter motor for
three seconds to equalize pressure in the pipework. Reconnect
the fuel pump wiring plug to the injection wiring harness.
Disconnect the battery negative lead.
Remove the air cleaner and disconnect the throttle cable from
the central injection unit.
Detach the fuel pipes from the central injection unit and plug
the pipe ends to prevent fuel leakage.
Disconnect the wiring plug (Fig.9-3) of throttle position sensor
4, injector 2 and idle air control valve 9.
On the central injection unit detach the vacuum hoses to the
canister and MAP sender, along with the crankcase vent hose.
Make certain everything is reconnected properly.
Undo the retaining pins and remove the central injection unit
from the intake pipe complete with the gasket. Plug the intake
pipe end to prevent entry of extraneous matter.
Refitting is the reverse order of removing. Pay attention to the
condition of the seals and gaskets, renew if applicable.
On completion, check the fuel pressure as described below.
WARNING. Never re-use the gasket mounted under the
central injection unit and sealing rings of fuel pipes.
Dismantling and reassembly.
Undo the retaining screws and remove throttle position (TP)
sensor 10 (Fig. 9-4), injector 6, fuel pressure regulator, vacuum
hose manifold housing 13 and idle air control valve 14.
Undo two retaining screws and disconnect the fuel supply
part from the throttle housing.
Reassembly is a reverse of dismantling. Examine the seals,
renew if applicable. When refitting the TP sensor, align the throt-
tle shaft flats with the TP sensor pickup lever.
Examination and repair
Injector
is a one-piece unit. When removing the injector,
take care not to damage the wiring plug or atomizer head.
WARNING. Never clean or wash the injector with petrol
or other cleaners.
Renew the injector seals. In the event of deposits on the
injector filters (the major diameter filter is a purge filter, while the
minor diameter filter is an intake filter), blow the filters with com-
pressed air, then flush the fuel tank and fuel pipes.
Apply sealant on the retainer screw thread when refitting the
injector.
Fuel pressure regulator.
Remember that the spring under
the regulator cover is compressed, so exercise care when
unscrewing the cover.
When the regulator is removed, examine the valve seats, use
a magnifying glass if necessary. The seat must not show any pit-
ting, dents or surface irregularities, otherwise renew the fuel sup-
ply housing of the central injection unit.
It is recommended to renew the valve diaphragm after each
dismantling. Always smear the thread of the regulator cover
securing screw with sealant.
WARNING. When refitting the fuel pressure regulator
check to see the diaphragm sits correctly without skewing.
Fuel supply housing of central injection unit.
During
reassembly of the central injection unit always renew the gasket
between the fuel supply housings and throttle plate. Cut-outs in
the gasket should be aligned with the bores in the throttle plate.
186
Fig.9-2. Removing the central injection unit and intake pipe:
1 - intake manifold preheater; 2 - intake manifold; 3 - central injection unit
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