1990 FORD SIERRA four wheel drive

working on the exhaust system, ensure
that the converter is well clear of any
jacks or other lifting gear used to raise the
car and do not drive the car over rough
ground, road humps, etc., in such a way
as to “ground” the exhaust system.
j)In some cases, particularly when the car is
new and/or is used for stop/start driving, a
sulphurous smell (like that of rotten eggs)
may be noticed from the exhaust. This is
common to many catalytic converter-
equipped cars and seems to be due to the
small amount of sulphur found in some
petrols reacting with hydrogen in the
exhaust to produce hydrogen sulphide
(H2S) gas; while this gas is toxic, it is not
produced in sufficient amounts to be a
problem. Once the car has covered a few
thousand miles the problem should
disappear - in the meanwhile a change of
driving style or of the brand of petrol used
may effect a solution.
k)The catalytic converter, used on a well-
maintained and well-driven car, should
last for between 50 000 and 100 000
miles - from this point on, careful checks
should be made at all specified service
intervals of the CO level to ensure that the
converter is still operating efficiently - if
the converter is no longer effective it must
be renewed.
EEC IV module - warning
Following disconnection of the battery, the
information stored in the EEC IV module
memory will be erased. After reconnecting the
battery, the engine should be allowed to idle for
three minutes. Once the engine has reached
normal operating temperature, the idle speed
should be increased to 1200 rpm and
maintained for approximately 2 minutes, which
will allow the module to “re-learn” the optimum
idle values. It may be necessary to drive the
vehicle in order for the module to “re-learn” the
values under load. The module should complete
its learning process after approximately 5 miles
(8 kilometres) of varied driving.
Refer to Chapter 1, Section 38.
2.0 litre SOHC models
1Disconnect the battery negative lead.
2Depress the locking clip on the airflow
meter wiring plug and disconnect the plug.
Pull on the plug, not the wiring.
3Loosen the securing clip and disconnect
the air inlet hose from the airflow meter.
4Release the four securing clips and lift off
the air cleaner lid with the airflow meter.
5Remove the left-hand front wheel arch liner.
6Working under the wheel arch, unscrew the
three air cleaner securing nuts and washers.
7Disconnect the air inlet tube, and withdrawthe air cleaner from the engine compartment.
8Refitting is a reversal of removal.
2.0 litre DOHC models
9Disconnect the battery negative lead.
10Disconnect the wiring plug from the idle
speed control valve at the front of the plenum
chamber.
11Loosen the clamp, and detach the air inlet
hose from the air inlet tubing.
12Unscrew the securing nut, and release the
air inlet tube from the bracket on the engine
compartment front panel.
13Release the air cleaner lid securing clips,
then lift away the air inlet tube, plenum
chamber and air cleaner lid as an assembly,
disconnecting the breather hose from the air
inlet tube.
14Lift out the air cleaner element then wipe
the inside of the air cleaner lid and casing clean.
15Remove the left-hand front wheel arch liner.
16Working under the wheel arch, unscrew the
three air cleaner securing nuts and washers.
17Disconnect the air inlet tube, and
withdraw the air cleaner from the engine
compartment.
18Refitting is a reversal of removal.
1.6 and 1.8 litre (R6A type) CVH
models
1.6 litre
19Remove the screws from the top of the air
cleaner cover.
20Disconnect the cold air inlet hose from the
air cleaner spout or the inlet on the front body
panel. The hose is secured by toggle clips.
21Disconnect the hot air inlet hose from the
air cleaner spout or the hot air shroud on the
exhaust manifold.
22Where applicable, remove the screw
securing the air cleaner body to the camshaft
cover.
23Withdraw the air cleaner and disconnect
the breather hose from the camshaft cover.
24Refitting is a reversal of removal, ensure
the disturbed hoses are securely connected.
1.8 litre
25Undo the two nuts, lift off the air cleaner
cover, and remove the element.26Disconnect the engine breather hose and
the oil separator hose, then undo the three
nuts and lift up the air cleaner casing (see
illustrations).
27Disconnect the yellow striped vacuum
hose from the underside of the casing, detach
the air inlet hose, and remove the air cleaner
assembly.
28Refitting is a reversal of removal, ensuring
all hoses are correctly attached.
1Disconnect the battery negative lead.
2Remove the air cleaner assembly.
3Position a suitable container (or a sufficient
quantity of absorbent cloth) beneath the fuel
inlet connection on the CFI unit.
4Use an open-ended spanner on the flats of
the inlet union screwed into the CFI unit, to
prevent it from turning while the inlet pipe
union is loosened (see illustration). Allow all
pressure/fuel seepage to dissipate before fully
unscrewing the union if it is to be
disconnected, or tightened if another part of
the system is to be worked on.
4Fuel system (1.6 and 1.8 litre
(R6A type) CVH) - depressurisation
3Air cleaner - removal and
refitting
2Air cleaner element - renewal
4B•4Fuel and exhaust systems - fuel injection
3.26b Air cleaner casing attachments - 1.8
litre (R6A) CVH
A Casing retaining nuts (arrowed)
B Vacuum hose (arrowed)
3.26a Air cleaner cover and hose
attachments - 1.8 litre (R6A) CVH
A Cover retaining nuts
B Engine breather hose
C Oil separator hose
Remember to depressurise the
fuel system before loosening any
connections.
Refer to the precautions in
Section 1 before proceeding. The fuel
system will remain pressurised after the
engine is switched off.
4.4 CFI unit fuel inlet union (arrowed)