Contents - Volkspage

Fuel system: multi-point injection models 4B.5
necessary. It is therefore recommended that
this operation is entrusted to a automotive
electrical specialist.
Throtte body
Removal
23 Refer to Section 4 and detach the
accelerator cable from the throttle valve lever.
24 Slacken the clips and detach the inlet air
ducting from the top of the throttle body inlet.
Remove the bolts, lift off the throttle body inlet
elbow and recover the seal (see illustrations).
25 On engine code 3F, remove the throughbolt
and detach the inlet housing from the top
of the throttle body. On engine code PY,
remove the screws and detach the bypass
valve housing from the top of the throttle
body.
26 Disconnect the battery negative cable and
position it away from the terminal, then unplug
the harness connector from the throttle
potentiometer.
27 Disconnect the vacuum hoses from the
ports on the throttle body, noting their order
of fitment. Release the wiring harness from
the guide clip.
28 Slacken and withdraw the bolts (see
illustration), then lift the throttle body away
from the inlet manifold. Recover and discard
the gasket.
Refitting
29 Refitting is a reversal of removal, noting
the following:
a) Use a new throttle body-to-inlet manifold
gasket.
b) Observe the correct tightening torque
when refitting the throttle body throughbolts/screws.
c) Ensure that all vacuum hoses and
electrical connectors are refitted securely.
d) With reference to Section 4, check and if
necessary adjust the accelerator cable.
Fuel injectors and fuel rail
A
Warning: Observe the
precautions in Section 1 before
! working on any component in
the fuel system. Ideally this
operation should be carried out when the
engine is cold.
Removal
30 Disconnect the battery negative cable and
position it away from the terminal.
31 Refer to the relevant sub-Section in this
Chapter and remove the throttle body.
32 Unplug the injector wiring harness at the
multiway connector, which is located at the
end of the fuel rail (see illustration).
33 Refer to Section 8 and depressurise the
fuel system.
34 Disconnect the vacuum hose from the
port on the top of the fuel pressure regulator
(see illustration).
35 Slacken the clips and disconnect the
fuel supply and return hoses from the ports on
the fuel rail and pressure regulator
5.24a Slacken the clips and detach the
inlet air ducting from the top of the
throttle body inlet
5.24c . . . and recover the seal
(see illustrations). Carefully note the fitted
positions of the hoses - the supply hose is
colour-coded black and the return hose is
colour-coded with a blue band.
5.32 Unplug the injector wiring harness at
the multiway connector
5.35a Slacken the clips and disconnect
the fuel supply hose. . .
5.24b Remove the bolts, lift off the throttle
body inlet elbow . , .
5.28 Slacken and withdraw the
four throttle body retaining bolts
(three arrowed, one hidden)
36 Slacken and withdraw the fuel rail
retaining screws, then carefully lift the fuel rail
away from the inlet manifold, together with the
injectors. Recover the injector lower O-ring
5.34 Disconnect the vacuum hose from the
top of the fuel pressure regulator
5.35b . . . and return hose (arrowed)