Idle Air Cutoff Valve (1.8L Models) — Description and Testing (Opel Vectra A)

Note: Before you begin, see. Chapter 2.

Description

1. On 1.8 liter models, the carburetor is equipped with an idle cut-off valve. This is an electrically controlled valve that closes the idle mixture circuit when the ignition is turned off, thus preventing the engine from running after the ignition is turned off (see illustration).



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2. The idle air cut-off valve is on all the time the ignition is on. A faulty winding or a break in the power supply circuit can cause the engine to shut off or run erratically at idle, although it may normally run fine at speed.

Examination

3. If you suspect a winding malfunction, first make sure that there is battery voltage at its terminals with the ignition on.

4. If there is no voltage, then the wiring to the winding is damaged. If there is supply voltage at the terminals, the winding can be checked as follows.

5. After unscrewing the valve winding from the carburetor, connect its body to the negative terminal of the battery. When touching the positive terminal of the battery with the central clamp of the winding, a click should be heard, and the needle should be drawn into the tip of the electromagnetic block.

6. The faulty shut-off valve must be replaced.