1985 FORD GRANADA octane

Chapter 4
Fuel and exhaust systems
Air cleaner and element - removal and refitting . . . . . . . . . . . . . . . . .2
Air cleaner temperature control - description and testing . . . . . . . . .3
Carbon canister - removal and refitting . . . . . . . . . . . . . . . . . . . . . .44
Carbon canister purge solenoid - removal and refitting . . . . . . . . . .45
Exhaust gas oxygen (HEGO) sensor - removal and refitting . . . . . .43
Exhaust manifold(s) - removal and refitting . . . . . . . . . . . . . . . . . . .41
Exhaust system - inspection, repair and renewal . . . . . . . . . . . . . .42
Fuel cut-off inertia switch - removal and refitting . . . . . . . . . . . . . . . .7
Fuel filter - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Fuel gauge sender unit - removal and refitting . . . . . . . . . . . . . . . . . .6
Fuel-injection system - depressurisation . . . . . . . . . . . . . . . . . . . . .28
Fuel-injection system - idle speed and mixture adjustments . . . . . .31
Fuel-injection system relays - location . . . . . . . . . . . . . . . . . . . . . . .29
Fuel-injectors - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . .36
Fuel pressure regulator - removal and refitting . . . . . . . . . . . . . . . .37
Fuel pump - testing, removal and refitting . . . . . . . . . . . . . . . . . . . . .4
Fuel rail temperature switch - removal and refitting . . . . . . . . . . . . .39
Fuel tank - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . .1
Idle speed control valve - removal and refitting . . . . . . . . . . . . . . . .34
Inlet manifold - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . .40
Mixture adjustment potentiometer - removal and refitting . . . . . . . .38
Pierburg 2V carburettor - dismantling and reassembly . . . . . . . . . .13
Pierburg 2V carburettor - fast idle adjustment . . . . . . . . . . . . . . . . .14
Pierburg 2V carburettor - idle speed and mixture adjustments . . . .11
Pierburg 2V carburettor - removal and refitting . . . . . . . . . . . . . . . .12Throttle body - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . .33
Throttle cable - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . .9
Throttle pedal - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . .8
Throttle position sensor - removal and refitting . . . . . . . . . . . . . . . .32
Unleaded fuel - general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Vane airflow meter(s) - removal and refitting . . . . . . . . . . . . . . . . . .35
Vapour separator - removal and refitting . . . . . . . . . . . . . . . . . . . . .10
Weber 2V carburettor - automatic choke adjustment . . . . . . . . . . .18
Weber 2V carburettor - dismantling and reassembly . . . . . . . . . . . .17
Weber 2V carburettor - idle speed and mixture adjustments . . . . .15
Weber 2V carburettor - removal and refitting . . . . . . . . . . . . . . . . . .16
Weber 2V TLD carburettor - automatic choke unit removal,
refitting and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Weber 2V TLD carburettor - accelerator pump diapragm renewal .25
Weber 2V TLD carburettor - idle speed and mixture adjustments . .19
Weber 2V TLD carburettor - low vacuum enrichment
diaphragm renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Weber 2V TLD carburettor - needle valve and float removal,
refitting and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Weber 2V TLD carburettor - power valve diaphragm renewal . . . . .23
Weber 2V TLD carburettor - removal and refitting . . . . . . . . . . . . .20
Weber 2V TLD carburettor - secondary throttle valve vacuum
diaphragm renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Weber 2V TLD carburettor - throttle kicker removal, refitting
and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
General
System type:
1.8 litre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Twin choke Pierburg carburettor
2.0 litre carburettor:
SOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Twin choke Weber 2V carburettor
DOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Twin choke Weber 2V TLD carburettor
All models with fuel injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multi-point fuel-injection system controlled by EEC IV engine
management system
Fuel tank capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 litres (15.4 gallons) approx
Fuel grade*:
Leaded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 octane RON (UK 4-star)
Unleaded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 octane RON (Premium)
* Models fitted with a catalytic converter must be operated on unleaded fuel at all times. Do notuse leaded fuel as the catalyst will be destroyed.
Idle speed:
1.8 litre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 ± 20 rpm
2.0 litre carburettor:
SOHC* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 or 875 rpm
DOHC:
Manual gearbox* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 ± 25 rpm
Automatic transmission* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 875 ± 25 rpm
2.0 litre fuel-injection:
SOHC* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 or 875 rpm
DOHC* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 875 ± 50 rpm
4•1
Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,
suitable for competent
DIY mechanicDifficult,suitable for
experienced DIY
mechanicVery difficult,
suitable for expert
DIY or professional
Degrees of difficulty
Specifications Contents
4
procarmanuals.com

Models up to July 1990
1The carbon canister is situated in the engine
compartment where it is mounted onto the
right-hand valance next to the suspension
strut mounting.
2To remove the canister first disconnect the
battery negative terminal. If necessary, undo
the two coolant expansion tank retaining
screws and position the tank clear of the
canister to improve access.
3Disconnect the vacuum hose from the top
of the canister.
4Slacken and remove the mounting bolt and
withdraw the canister from the engine
compartment.
5Refitting is a reverse of the removal
procedure.
Models from July 1990
6The carbon canister is situated behind the
right-hand rear wheel where it is mounted onto
the vehicle underbody (see illustration).
7To gain access to the canister, chock the
front wheels then jack up the rear of the
vehicle and support it securely on axle stands
(see “Jacking”).
8Disconnect the battery negative terminal.
9Disconnect the vacuum hose from the top
of the canister and remove the canister
retaining screw.
10Lift the canister upwards to disengage it
from the mounting bracket and remove it from
under the car.
11Refitting is a reversal of the removal
procedure ensuring that the canister retaining
clip is correctly located in the mounting
bracket.1The purge solenoid is located on the right-
hand side of the engine compartment next to the
suspension strut mounting (see illustration).
2Disconnect the battery negative lead.
3Disconnect the solenoid wiring plug halves
by releasing the locktabs and pulling on the
plug halves, not the wiring.
4Note the locations of the two solenoid
pipes, and the orientation of the solenoid to
assist with refitting.
5Disconnect the two pipes from the solenoid,
and withdraw the solenoid from the location.
6Refitting is a reversal of removal, ensuring
that the solenoid pipes are correctly
reconnected, and that the solenoid is correctly
orientated as noted before removal.
SOHC and 2.8 litre V6 engines
1It is generally believed that continuous use
of unleaded fuel can cause rapid wear of
conventional valve seats. Valve seat inserts
which can tolerate unleaded fuel are fitted to
some engines. These engines are identified as
follows:
1.8 litre - S stamped adjacent to No 4 spark
plug
2.0 litre - A, L, P, PP or R stamped adjacent
to No 4 spark plug
2.8 litre - D or E stamped in centre of
cylinder head exhaust flange
2Engines which are marked as above can be
run entirely on unleaded fuel.
3Engines which are not fitted with the specialvalve seat inserts can still be run on unleaded
fuel, but one tankful of leaded fuel should be
used for every three tankfuls of unleaded. This
will protect the valve seats.
4On all models, the ignition timing may have
to be retarded when unleaded fuel is used. For
up to date information consult a Ford dealer.
DOHC engines
5All models can be operated on unleaded
petrol without the need for any adjustments.
Note that models fitted with a catalytic
converter must only be operated on unleaded
petrol, and leaded petrol must notbe used.
2.4 & 2.9 litre V6 engines
6All engines can be run on 95 octane
unleaded fuel (ie Premium grade unleaded).
7On 2.9 litre models equipped with a manual
gearbox produced after approximately
December 1988 and models equipped with
automatic transmission which were produced
after approximately July 1988, there is no
need to adjust the ignition timing to run on
unleaded petrol. These models can be
identified by their ignition module number
suffixes; on manual gearbox models the
module should have a JA suffix and on models
equipped with automatic transmission the
module should have a BD suffix. Refer to your
Ford dealer for further information.
8On all other earlier models, the ignition
timing must be adjusted before the engine can
be run on unleaded petrol. On these models
the timing must be adjusted by the fitment of
an octane adjustment lead, described in
Chapter 5, Section 23. On both the 2.4 & 2.9
litre engines, the lead should be fitted and the
red terminal earthed; this retards the ignition
timing by 4°from the initial setting of 12°
BTDC, to the correct setting of 8°BTDC.
9Models which are equipped with a catalytic
converter must be run on unleaded fuel only.
46Unleaded fuel - general
45Carbon canister purge
solenoid (models with
catalytic converter) - removal
and refitting44Carbon canister (models with
catalytic converter) - removal
and refitting
Fuel and exhaust systems 4•23
4
44.6 Carbon canister location (arrowed) -
models from July 199045.1 Carbon canister purge valve
procarmanuals.com

The ignition system is responsible for
igniting the fuel/air charge in each cylinder at
the correct moment. The components of the
system are the spark plugs, ignition coil,
distributor and connecting leads. Overall
control of the system is one of the functions of
the engine management module. Fuel-
injection models have a subsidiary ignition
module mounted on the distributor.
There are no contact breaker points in the
distributor. A square wave signal is generated
by the distributor electro-magnetically; this
signal is used by the engine management
module as a basis for switching the coil LT
current. Speed-related (centrifugal) advance is
also handled by the module. On carburettor
models, ignition timing is also advanced under
conditions of high inlet manifold vacuum.The engine management models are “black
boxes” which regulate both the fuel and the
ignition systems to obtain the best power,
economy and emission levels. The module
fitted to carburettor models is known as the
ESC II (Electronic Spark Control Mk II) module.
On fuel-injection models the more powerful
EEC IV (Electronic Engine Control Mk IV)
module is used.
Both types of module receive inputs from
sensors monitoring coolant temperature,
distributor rotor position and (on some
models) manifold vacuum. Outputs from the
module control ignition timing, inlet manifold
heating and (except on 1.8 litre models) idle
speed. The EEC IV module also has overall
control of the fuel-injection system, from
which it receives information.
Provision is made for the ignition timing to
be retarded to allow the use of low octane fuel
if necessary. On all except 1.8 litre models
there is also a facility for raising the idle speed.The EEC IV module contains self-test
circuitry which enables a technician with the
appropriate test equipment to diagnose faults
in a very short time. A Limited Operation
Strategy (LOS) means that the car is still
driveable, albeit at reduced power and
efficiency, in the event of a failure in the
module or its sensors.
Due to the complexity and expense of the
test equipment dedicated to the engine
management system, suspected faults should
be investigated by a Ford dealer, or other
competent specialist. This Chapter deals with
component removal and refitting, and with
some simple checks and adjustments.
On DOHC carburettor engines, the basic
operating principles of the ignition system are
as described above. A development of the
ESC II (Electronic Spark Control ll) system is
used to control the operation of the engine.
The ESC II module receives information from a
crankshaft speed/position sensor and an
1General information and
precautions
5•2Engine electrical systems
Ignition coil
Make . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bosch, Femsa or Polmot
Primary resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.72 to 0.86 ohm
Secondary resistance:
All except DOHC fuel-injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5 to 7.0 k ohms
DOHC fuel-injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5 to 8.6 k ohms
Output voltage (open-circuit):
All except DOHC fuel-injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 kV minimum
DOHC fuel-injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 kV minimum
HT leads
Maximum resistance per lead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 k ohms
Distributor
Make . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bosch or Motorcraft
Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Clockwise (viewed from above)
Automatic advance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Controlled by module
Dwell angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Controlled by module
Ignition timing (see text)
SOHC and 2.8 litre V6 engines:
Leaded fuel (97 octane):
Carburettor models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10°BTDC
Fuel-injection models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12°BTDC
Unleaded fuel (95 octane):
Carburettor models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6°BTDC
Fuel-injection models:
2.0 litre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8°BTDC
2.8 litre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12°BTDC (no change)
2.4 & 2.9 litre V6 engines:
Models with catalytic converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15°BTDC
Models without catalytic converter . . . . . . . . . . . . . . . . . . . . . . . . . . .12°BTDC*
* Standard setting for 97 octane leaded fuel.
Torque wrench settingsNmlbf ft
Alternator adjusting strap:
To steering pump bracket (OHC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 to 2616 to 19
To front cover (V6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 to 5130 to 38
Spark plugs:
All models except 2.8 litre V6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 to 2815 to 21
2.8 litre V6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 to 4022 to 30
Air charge temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 to 2515 to 18
Engine coolant temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 to 2515 to 18
Fuel rail temperature sensor (DOHC) . . . . . . . . . . . . . . . . . . . . . . . . . . .8 to 116 to 8
Crankshaft speed/position sensor screw (DOHC) . . . . . . . . . . . . . . . . .3 to 52 to 4
procarmanuals.com

12When the distributor is at the firing point,
the leading edge of one of the vanes should be
in line with the rib on the sensor (see
illustration). Turn the distributor body slightly
if necessary to achieve this.
13Refit the clamp plate and bolt. Just nip up
the bolt for the time being. Tighten it finally
after checking the timing. Also secure the
support bracket, when fitted.
14Refit the rotor arm, distributor cap and HT
leads.
15Reconnect the distributor multi-plug.
16Reconnect the battery. Run the engine
and check the ignition timing as described in
the next Section.
2.4 & 2.9 litre V6 engines
Note: The distributor should not be removed
or disturbed without good cause, since the
accuracy of timing achieved in production is
unlikely to be regained. If difficulty is
experienced in setting the timing after refitting,
or if a new distributor has been fitted, the
timing should be set by a Ford dealer using a
STAR (Self Test Automatic Readout) tester.
17Disconnect the battery negative lead.
18Disconnect the HT leads from the spark
plugs noting the correct fitted locations.
19Release the distributor cap and place it to
one side, complete with the HT leads.
20Turn the engine by means of the vibration
damper centre bolt until No 1 piston is at its
firing point (12°BTDC) (see illustration).
21If there is no mark visible, mark the rim of
the distributor body to indicate the point of
alignment of the contact end of the rotor.
22Mark the position of the distributor
mounting plate in relation to the cylinder
block.
23Disconnect the distributor wiring
connector.
24Scrape the sealant from around the
distributor clamp bolt then unscrew the bolt
and withdraw the distributor.
25Prior to refitting the distributor check that
the crankshaft is still set in the 12°BTDC
position for the No 1 piston.
26Hold the distributor over the hole so that
the mounting plinth and cylinder head marks
are aligned then align the rotor arm contact
end with the mark on the distributor rim (see
illustration).
27As the distributor is inserted, the rotor will
turn due to the meshing of the drive gears.
When the distributor is fully inserted, rotate the
distributor body until the rotor arm aligns with
mark C on the distributor rim.
28Once the rotor arm, cylinder head and
distributor alignment marks are all correctly
aligned, fit the clamp bolt and tighten it
securely.
29Refit the distributor cap then connect the
HT leads, reconnect the vacuum pipe and
wiring plug.
30Run the engine to normal operating
temperature and check the ignition timing,
bearing in mind the note made at the start of
this sub-Section.
All engines except DOHC
1Ignition timing is set very accurately in
production. It does not need to be checked or
adjusted on a routine basis. Adjustment will
only be necessary if the distributor, or an
associated component such as the timing belt,
has been disturbed.
2Before checking the timing, the following
conditions must be met:
a)The engine must be warmed up
b)On carburettor models, the vacuum pipe
must be disconnected from the manifold
and the manifold hole be plugged
c)Idle speed must be below 900 rpm
d)Any earthed “octane adjustment” wires
must be temporarily isolated
3Locate the timing marks. On SOHC engines
the timing scale is on the crankshaft pulley,
and a pointer on the timing cover must be
aligned with the appropriate mark on the
pulley (see illustration). Note that two
alternative types of pulley may be fitted (see
illustration).On V6 engines there is a single
notch on the pulley and the timing scale is on
the timing cover (see illustration).The desiredvalues are given in the Specifications.
Highlight the appropriate marks with white
paint.
4Connect a timing light (strobe) to No 1 HT
lead, following the maker’s instructions. Some
lights require additional power connections to
be made, either to the mains or to the battery.
5Run the engine at idle and shine the timing
light onto the marks. Take care not to get the
timing light leads, clothing etc tangled in the
fan blades or other moving parts. The timing
marks will appear stationary and (if the timing
is correct) in alignment.
14Ignition timing - checking
Engine electrical systems 5•7
5
13.12 Vane leading edge and sensor rib
(arrowed) are aligned at firing point13.20 Crankshaft pulley notch set to the 12°
BTDC position
14.3a Timing marks and pointer
Cast pulley shown
13.26 Rotor arm position before (1) and after (2) refitting the distributor
X = XC Notch
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6If adjustment is necessary, stop the engine.
Slacken the distributor clamp bolt and turn the
distributor body slightly. To retard the ignition
(move the mark nearer TDC) turn the
distributor body clockwise, and vice versato
advance the ignition. Tighten the clamp bolt
and re-check the timing.
7When adjustment is correct, stop the engine
and disconnect the timing light. Reconnect the
vacuum pipe, when applicable, and reconnect
any “octane adjustment” wires.
DOHC engine
8The ignition timing for this engine is
controlled by the ESC II or EEC IV module and
no adjustment is possible.
SOHC and 2.8 litre V6 engines
1Disconnect the battery negative lead.
2Disconnect the distributor multi-plug.
3On V6 models only, make alignment marks
between the distributor body and the engine.
Slacken the distributor clamp bolt and swivel
the distributor to make the module securing
screws accessible.
4Remove the two screws which secure the
module (see illustration). These screws are
deeply recessed. The screws seen here have
Torx heads; ordinary hexagon heads have also
been encountered, and to undo these a thin
socket or box spanner will be required.
5Pull the module downwards and remove it.
6When refitting, coat the rear face of the
module with heat sink compound to Ford spec
815F-12103-AA. This is extremely expensive,
so it may be worthwhile trying to obtain a
smear from a friendly dealer or auto
electrician.
7Plug the module into the distributor and
secure it with the two screws.8On V6 models, return the distributor to its
original position and nip up the clamp bolt.
9Reconnect the distributor multi-plug.
10Reconnect the battery and run the engine
to check for correct function.
11On V6 models, check the ignition timing
and then finally tighten the distributor clamp
bolt.
DOHC engine
12The ignition module is located in the left-
hand front corner of the engine compartment,
beside the air cleaner housing.
13To remove the module, first disconnect
the battery negative lead.
14To improve access remove the air cleaner
housing.
15Release the locking lug and disconnect
the ignition module wiring plug (see
illustration). Pull on the plug, not on the
wiring.
16Remove the two securing screws, and
remove the module from the engine
compartment.
17Refitting is a reversal of removal, ensuring
that the underside of the module and the
corresponding area of the body panel are
clean.
2.4 & 2.9 litre V6 engines
Note: Removal of the ignition module requires
the distributor to be disturbed.
18The ignition module is mounted onto the
side of the distributor.
19To remove the module first disconnect the
battery negative terminal.
20Carefully disconnect the distributor wiring
connector.
21Make alignment marks between the
distributor mounting and cylinder block then
scrape the sealant from around the distributor
clamp bolt and slacken but do not remove the
bolt.
22Rotate the distributor to gain access to the
ignition module retaining bolts.
23Slacken and remove the two retaining
bolts and carefully slide the module
downwards to disengage it from the
distributor, taking great care not to damage
the module wiring pins.
24Apply a coating of the special Ford heat-
sink compound (Part number 815F-12103-AA,
available from a Ford dealer This is extremely
expensive, so it may be worthwhile trying to
obtain a smear from a friendly dealer or auto
electrician) to the rear of the ignition module
and carefully slide the module into position on
the distributor. Note: Do not force the module
15Ignition module (fuel-injection
models) - removal and refitting
5•8Engine electrical systems
15.4 Two screws (arrowed) which secure
the ignition module15.15 Ignition module (viewed with air
cleaner removed)
14.3c Ignition timing marks - V6
A Timing scaleB Pulley14.3b Ignition timing marks - SOHC
A Cast pulleyB Pressed steel pulley
procarmanuals.com

2Disconnect the battery negative lead.
3Drain the cooling system (Chapter 3). Save
the coolant if it is fit for re-use.
4Disconnect the multi-plug from the sensor.
Pull on the plug, not on the wiring (see
illustration).
5Unscrew the sensor and remove it.
6Refit by reversing the removal operations.
Refill the cooling system.
Note: The manifold heater must not be
removed while it is hot.
1Disconnect the battery negative lead. 2Remove the air cleaner to improve access.
3Remove the three bolts which secure the
heater to the underside of the manifold.
4Disconnect the electrical feed from the heater.
5Remove the heater. Recover the gasket and
O-ring (see illustration).
6Use 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.
7Reconnect the electrical feed.
8Refit the air cleaner and reconnect the
battery.
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.
1All 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.
2Adjustment 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.
3The amount of ignition retardation is as
follows:
Wire(s) Degrees retard
earthed Carb. injection V6
Blue 2 4 6
Red 4 2 3
Blue and red 6 6 Forbidden
4Performance 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.
5If the yellow adjustment lead is earthed, thiswill 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
6The effect of the “octane adjustment” leads
on these models fitted with the ESC Hybrid
Module is as follows.
Red lead earthed2°retarded
Blue lead earthed4°retarded
Red and blue leads earthed6°retarded
1Fitted to DOHC engines,the sensor is
located at the right-hand rear of the cylinder
block, behind the oil filter (see illustration).
2To remove the sensor, first disconnect the
battery negative lead.
3Access 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”).
4Disconnect the wiring plug from the sensor.
5Remove the securing screw and withdraw the
sensor from the location in the cylinder block.
6Refitting is a reversal of removal, using a
new sensor O-ring and tightening the retaining
screw to the specified torque setting.
24Crankshaft speed/position
sensor - removal and refitting
23Ignition timing and idle speed
adjustments
22Engine management system
relays - testing
21Manifold heater (carburettor
models) - removal and refitting
Engine electrical systems 5•11
5
20.4 Coolant temperature sensor multi-plug21.5 Removing the manifold heater22.1 Engine management system relays
A Power holdB Manifold heater
23.2a Octane adjustment lead multi-plug
23.2b Service adjustment lead for timing
and idle adjustment
A Earthing point (coil
screw)
B Multi-plugC Cut wires not to be
earthed
24.1 Crankshaft speed/position sensor
(viewed from underneath)
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