Ford Granada 1985-1994, Owner'S Manual

Page: 127 / 254

20 Checking and adjustment should be
completed within 30 seconds of the meter
readings stabilising. If this has not been
possible, run the engine at 3000 rpm for 15
seconds, then allow the engine to idle. Re-
check the CO content and carry out further
adjustments if necessary.
21 On completion of adjustment, stop the
engine and disconnect the tachometer and the
exhaust gas analyser. Refit the cover to the
adjustment screw.
2.4 & 2.9 litre V6 engines
22 As with the 2.8 V6, idle speed is
electronically controlled. Basic idle speed
adjustment can only be carried out by a Ford
dealer using special equipment.
23 On models not equipped with a catalytic
converter, mixture adjustment can be carried
out as described above.
24 On models equipped with a catalytic
converter, the mixture is controlled by the EEC IV
module and no manual adjustment is possible.
SOHC and V6 engines
1 Disconnect the battery negative lead.
2 Free the throttle position sensor multi-plug
from its clip. On the OHC models this is below
the idle speed control valve, on the underside
of the inlet manifold; on V6 engines it is
located below the throttle valve housing.
3 Relieve the locktabs and unbolt the throttle
position sensor (see illustration). Pull the
sensor off the throttle valve shaft, disconnect
the multi-plug and remove the sensor.
4 Do not rotate the centre part of the sensor
beyond its normal range of movement, or
damage may result.
5 When refitting, line up the flat on the throttle
valve shaft with the flat on the centre of the
sensor. Make sure that the sensor is the right
way round and fit it over the shaft.
6 Fit and tighten the two bolts and secure it
with the locktabs.
7 Reconnect and secure the multi-plug, then
reconnect the battery.
DOHC engine
8 Disconnect the battery negative lead.
9 Free the throttle position sensor wiring plug
from the retaining clip located on the
underside of the throttle body. Disconnect the
wiring plug halves by releasing the locktabs
and pulling on the plug halves, not the wiring
(see illustration).
10 Unscrew the two sensor securing screws,
and withdraw the sensor from the throttle
shaft.
11 Refitting is a reversal of removal, noting
that the sensor fits with the wiring at the
bottom, and ensuring that the sensor
actuating arm engages correctly with the
throttle spindle.
1 On DOHC models, disconnect the battery
negative lead.
2 Free the throttle position sensor wiring plug
from the retaining clip located on the
underside of the throttle body. Disconnect the
wiring plug halves by releasing the locktabs
and pulling on the plug halves, not the wiring.
3 Disconnect the throttle cable and (where
necessary) the speed control cable from the
throttle linkage.
4 Loosen the securing clip, and disconnect
the air inlet hose from the throttle body.
5 Unscrew the four securing bolts and
withdraw the throttle body from the inlet
manifold along with the gasket.
6 Refitting is a reversal of removal, bearing in
mind the following points.
a)
Ensure that the mating faces of the
throttle body and the inlet manifold are
clean, and fit a new gasket.
b) On completion, adjust the throttle cable
and where necessary, adjust the speed
control cable so that there is only a small
amount of slack in the cable.
c) Where applicable, check and if necessary
adjust the idle mixture.
SOHC and all V6 engines
1 Disconnect the battery negative lead.
2 Disconnect the multi-plug from the idle
speed control valve by prising up the retaining
lug and pulling the plug, not the wires (see
illustration).
3 Remove the two securing nuts (OHC) or
bolts (V6) and withdraw the valve (see
illustration). Recover the gasket.
4 If necessary, the solenoid can be separated
from the valve block by removing the two
screws to enable the parts to be cleaned.
Contamination or air leaks in this area will
cause unstable idling. After careful cleaning,
the parts can be reassembled.
5 Refit the valve, using a new gasket, and
tighten the retaining nuts or bolts. Reconnect
the multi-plug and the battery.
6 Start the engine and check that the idle is
steady. Bring the engine to operating
temperature, then switch on all possible electrical
loads (headlights, heated screens, heater blower
etc) and check that the idle remains steady. This
confirms that the valve is working.
DOHC engine
7 Disconnect the battery negative lead.
8 Loosen the securing clip, and disconnect
the air inlet hose from the throttle body.
34 Idle speed control valve -
removal and refitting
33 Throttle body - removal and
refitting
32 Throttle position sensor -
removal and refitting
Fuel and exhaust systems 4•15
4
32.3 Throttle position sensor retaining bolts
(arrowed)
32.9 Throttle position sensor (A) and wiring
plug (B)
34.2 Disconnecting the idle speed control
valve
34.3 Removing the idle speed control valve