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20.4 Coolant temperature sensor multi-plug
2 Disconnect the battery negative lead.
3 Drain the cooling system (Chapter 3). Save
the coolant if it is fit for re-use.
4 Disconnect the multi-plug from the sensor.
Pull on the plug, not on the wiring (see
illustration).
5 Unscrew the sensor and remove it.
6 Refit by reversing the removal operations.
Refill the cooling system.
21 Manifold heater (carburettor
models) - removal and refitting
Note: The manifold heater must not be
removed while it is hot.
1 Disconnect the battery negative lead.
23.2a Octane adjustment lead multi-plug
23.2b Service adjustment lead for timing
and idle adjustment
A Earthing point (coil
C Cut wires not to be
screw)
earthed
B Multi-plug
21.5 Removing the manifold heater
2 Remove the air cleaner to improve access.
3 Remove the three bolts which secure the
heater to the underside of the manifold.
4 Disconnect the electrical feed from the heater.
5 Remove the heater. Recover the gasket and
O-ring (see illustration).
6 Use a new gasket and O-ring when refitting.
Offer the heater to the manifold, insert the
three bolts and tighten them evenly, making
sure that the heater does not tip or jam.
7 Reconnect the electrical feed.
8 Refit the air cleaner and reconnect the
battery.
22 Engine management system
relays - testing
All relays are located behind the facia panel.
Access is gained by removing the facia top
(see illustration).
Testing of a suspect relay is by substitution
of a known good unit.
23 Ignition timing and idle speed
adjustments
1 All models have a facility for retarding the
ignition timing by up to six degrees without
physically disturbing the distributor. The
adjustment is intended for use when the
correct grade of fuel is not available.
2 Adjustment is made by earthing one or two
leads (sometimes called "octane adjustment"
leads) which terminate in a multi-plug next to
the ignition coil (see illustrations). Ideally a
service adjustment lead, available from a Ford
dealer, should be used. Cut and insulate the
wires in the adjustment lead which are not to
be earthed.
3 The amount of ignition retardation is as
follows:
Wire(s)
Degrees retard
earthed
Carb.
injection
Blue
2
4
Red
4
2
Blue and red 6
6
4 Performance and efficiency will suffer as a
result of this adjustment. Normal timing should
be restored (by isolating the adjustment leads)
when the correct grade of fuel is available.
5 If the yellow adjustment lead is earthed, this
Engine electrical systems 5•11
22.1 Engine management system relays
A Power hold
will raise the idle speed by 75 rpm (OHC) or 50
rpm (V6). It may be found that the yellow lead
has already been earthed in production, in
which case disconnecting it will lower the idle
speed by the same amount. This adjustment
does not apply to 1.8 litre carburettor models.
1.8 models from January 1987
6 The effect of the "octane adjustment" leads
on these models fitted with the ESC Hybrid
Module is as follows.
Red lead earthed
Blue lead earthed
Red and blue leads earthed
24 Crankshaft speed/position
sensor - removal and refitting
1 Fitted to DOHC engines,the sensor is
located at the right-hand rear of the cylinder
block, behind the oil filter (see illustration).
2 To remove the sensor, first disconnect the
battery negative lead.
3 Access is most easily obtained from
underneath the vehicle. To improve access,
apply the handbrake, then jack up the front of
the vehicle and support it securely on axle
stands (see "Jacking").
4 Disconnect the wiring plug from the sensor.
5 Remove the securing screw and withdraw the
sensor from the location in the cylinder block.
6 Refitting is a reversal of removal, using a
new sensor O-ring and tightening the retaining
screw to the specified torque setting.
V6
6
3
Forbidden
24.1 Crankshaft speed/position sensor
(viewed from underneath)
B Manifold heater
2° retarded
4° retarded
6° retarded
5
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