ad blue FORD SIERRA 1988 2.G Routine Manintenance And Servicing Workshop Manual

Pierburg 2V carburettor
9Proceed as described for the Ford VV
carburettor. For adjustment screw location
(see illustration).
Weber 2V TLD carburettor
10Proceed as described for the Ford VV
carburettor, noting the following points:
11Ensure that the vacuum pipe and the
camshaft cover breather hose are securely
connected to the air cleaner and are free from
restrictions.
12When warming-up the engine, run the
engine until the cooling fan cuts in.
13For adjustment screw location (see
illustration).
Fuel injection
2.0 litre SOHC models
14Idle speed is controlled by the EEC IV
module and the only means of adjustment
provided is by the yellow “idle speed
adjustment” wire (Chapter 5, Section 17) which
allows the idle speed to be raised by 75 rpm.
2.0 litre DOHC models
15Idle speed is controlled by the EEC IV
module, and manual adjustment is not
possible.
16The “base” idle speed can be adjusted,
but only by a Ford dealer, using special
equipment.
Ford VV carburettor
1Ensure that the air cleaner is correctly fitted
and that all vacuum hoses and pipes are
securely connected and free from restrictions,
then run the engine until it is at normal
operating temperature.
2Stop the engine, and connect a tachometer
and an exhaust gas analyser in accordance
with the manufacturer’s instructions.
3Start the engine and run it at 3000 rpm for 30
seconds, ensuring that all electrical loads are
switched off (headlamps, heater blower etc),
then allow the engine to idle and check the idle
speed and CO content. Note that the CO
reading will initially rise, then fall and finally
stabilise after between 5 and 25 seconds.
4If the reading noted in paragraph 3 is not as
specified, proceed as follows.
5Using a thin screwdriver, remove the
tamperproof seal from the mixture screw.6Run the engine at 3000 rpm for 30 seconds,
then allow the engine to idle, and using a
small screwdriver or a 4.0 mm Allen key, as
applicable, adjust the mixture screw to give
the specified CO content.
7Checking and adjustment should be
completed within 30 seconds of the meter
readings stabilising. If this has not been
possible, then repeat paragraph 6.
8If necessary adjust the idle speed, then
recheck the CO content.
9On completion of the adjustments, stop the
engine and disconnect the tachometer and
exhaust gas analyser. Fit a new tamperproof
seal to the mixture screw.
Weber 2V carburettor
Models without stepper motor
10Proceed as described for the Ford VV
carburettor but note the following:
11To remove the mixture screw tamperproof
seal, it will be necessary to drill the seal in
order to prise it from the mixture screw
housing. Alternatively a self-tapping screw
can be used to draw out the seal. If the
tamperproof seal is to be renewed, ensure
that a blue-coloured replacement seal is
fitted.
12It is permissible to loosen the air cleaner
securing screws to allow easier access to the
carburettor adjustment screws, but ensure
that all vacuum hoses and pipes are securely
connected.
Models with stepper motor (ESC II
system)
13If necessary, the mixture can be adjusted
as described for the Ford VV carburettor with
reference to paragraphs 11 and 12 of this
Section. Do not attempt to adjust the idle
speed on completion of mixture adjustment.
For adjustment screw location (see
illustration).
Pierburg 2V carburettor
14Proceed as described for the Ford VV
carburettor.
Weber 2V TLD carburettor
15Proceed as described for the Ford VV
carburettor, noting the following points:
16Ensure that the vacuum pipe and the
camshaft cover breather hose are securely
connected to the air cleaner and are free from
restrictions.
17When warming-up the engine, run the
engine until the cooling fan cuts in.
18If adjustment of the mixture (CO content)
is required, the air cleaner must be removed
for access to the adjustment screw, as
follows.
19Remove the air cleaner, and prise the
tamperproof seal from the mixture screw.
20Loosely refit the air cleaner, ensuring that
the vacuum pipe and the camshaft cover
breather hose are securely connected and
free from restrictions (there is no need to
secure the air cleaner in position).
21On completion, fit a new tamperproof seal
to the mixture screw (the service replacement
plug is coloured blue), and refit the air cleaner
assembly.
Fuel injection
2.0 litre SOHC models
22The idle mixture can be checked and if
necessary adjusted as follows:
23Run the engine until it is at normal
operating temperature.
24Stop the engine and connect a
tachometer and an exhaust gas analyser in
accordance with the manufacturer’s
instructions.
16Mixture adjustment check
1•12Every 6000 miles or 6 months
15.9 Pierburg 2V carburettor adjustment
screw locations
A Idle speed screwB Idle mixture screwA Idle mixture screwB Idle speed screw
16.13 Weber 2V carburettor idle mixture
adjustment screw location (arrowed) -
2.0 litre models from 1985
15.13 Weber 2V TLD carburettor
adjustment screw locations
Caution: Refer to the
precautions in Section 1,
Chapter 4, Part A or B (as
applicable), before proceeding.
Before carrying out any carburettor
adjustments, ensure that the ignition
timing and spark plug gaps are set as
specified. To carry out the adjustments an
accurate tachometer and an exhaust gas
analyser (CO meter) will be required.