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:

    Cylinder head and pistons - decarbonising
    1 With the cylinder head removed as described in Section 7, the carbon deposits should be removed from the combustion surfaces using a blunt scraper. Take great care as the head is of light alloy ...

    Exhaust manifold - removal and refitting
    Removal 1 Disconnect the battery negative lead. 2 Remove the air cleaner and pull the hot air pick-up pipe from the exhaust manifold hot air shroud. 3 Remove the securing screws (1 screw on DOHC ...

    Fuel system (1.6 and 1.8 litre (R6A type) CVH) - depressurisation
    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 sw ...