Ford Sierra Manual

Spark control system components (carburettor models) - removal and refitting
Engine electrical systems / Spark control system components (carburettor models) - removal and refitting


Spark delay and sustain valves 1 Disconnect the vacuum pipes at the valve and withdraw the valve.

2 When refitting a spark delay valve, the valve must be positioned with the black end (marked CARB) towards the carburettor and the coloured end (marked DIST) towards the distributor or electronic module (as applicable).

3 When refitting a spark sustain valve, the valve must be positioned with the end marked VAC towards the carburettor and the side marked DIST towards the distributor or electronic module (as applicable).

Ported vacuum switch
4 Where fitted, the switch(es) may be located in the inlet manifold and/or in an adapter fitted in one of the coolant hoses.

5 To remove a switch, partially drain the cooling system. Note that there is no need to remove the cylinder block drain plug.

6 Mark the vacuum pipes for location so that they can be refitted in their correct positions, then disconnect the pipes from the switch.

7 Unscrew the valve from its location.

8 Refitting is a reversal of removal, ensuring that the vacuum pipes are correctly connected. Refill the cooling system.

Fuel trap
9 Disconnect the vacuum pipes at the fuel trap and withdraw the fuel trap.

10 When refitting, the fuel trap must be positioned with the black end (marked CARB) towards the carburettor, and the white side (marked DIST) towards the distributor, electronic module, or ported vacuum switch (as applicable) (see illustration).

22.10 Fuel trap vacuum connection markings
22.10 Fuel trap vacuum connection markings

Spark control system additional components
11 According to model, engine and equipment, additional components such as one-way valves or solenoids may also be fitted as part of the spark control system.

12 The removal and refitting procedures for these components are basically as described previously, and provided that all attachments are marked for position prior to removal, no problems should be encountered.


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