Idle Speed Control Valve (ISCV) - removal, cleaning and refitting
Removal
1 Disconnect the battery negative lead.
2 Disconnect the valve wiring plug (see illustration).
12.2 Idle speed control valve - 1.6 EFI engine
A Wiring plug B Securing bolts
3 Unscrew the two securing bolts, and withdraw the valve from the air cleaner housing.
Cleaning
4 Remove the valve as described earlier in
this Section.
5 Immerse the valve in a container of clean petrol and allow it to soak for approximately three minutes.
6 Use a clean paint brush to clean the bore, slots and piston of the valve.
7 Using a small screwdriver, carefully move the piston up and down in the bore (do not use the slots to do this), then rinse the valve with petrol and dry it, preferably using compressed air (see illustration).
12.7 Using a screwdriver to move the idle speed control valve piston - 1.6
EFI engine
8 Refit the valve as described in the following paragraphs.
Refitting
9 Refitting is a reversal of removal, ensuring
that the mating faces of the valve and air
cleaner are clean.
10 On completion, start the engine and check that the idle speed is stable, and that there are no air leaks. Warm the engine up to normal operating temperature, then switch on all available electrical loads and check that the idle speed is maintained.
See also:
General information
The 2.0 litre DOHC (Double OverHead
Camshaft) engine was introduced in August
1989 to replace the 2.0 litre SOHC engine
used previously in the Sierra range. The
engine is of four-cylinder, in-line ...
Sump - removal and refitting
Note: A new gasket and new sump bolts must
be used when refitting, and suitable sealant will
be required (available from a Ford dealer). Note
that it is preferable to keep the engine upright
until ...
Crankcase ventilation system check (Every 12 000 miles (20 000 km) or 12
months)
1 Inspect the crankcase ventilation system
for blockage or damage. A blocked hose can
cause a build-up of crankcase pressure,
which in turn can cause oil leaks (see
illustration).
35.1 Loosenin ...