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
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
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:

    Water pump - removal and refitting
    OHV engines Note: A new gasket and suitable jointing compound must be used on refitting. Removal 1 Drain the cooling system as described in Chapter 1. 2 Slacken the three water pump pulley reta ...

    Thermo-viscous cooling fan (SOHC models) - removal and refitting
    Removal 1 Disconnect the battery negative lead. 2 Remove the four retaining clips and unscrew the two retaining screws, then withdraw the upper section of the fan shroud (see illustrations). 1 ...

    Cylinder head - removal and refitting
    Removal Note: On HCS engines, cylinder head bolts may be used a total of three times (including initial fit) and must be suitably marked to indicate each removal operation. A new cylinder head ga ...