Note: Before you start, see Chapter 2.
Description
1. On 1.8 liter models, the carburetor is equipped with an idle shut-off valve. This is an electrically operated 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).
2. The idle shut-off valve is on all the time the ignition is on. A winding failure or an open circuit in the power supply may cause the engine to shut down or run erratically at idle, although it may normally run normally at speed.
Examination
3. If you suspect a winding failure, first make sure that battery voltage is present at its clamps 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. Having unscrewed the valve winding from the carburetor, attach 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 unit.
6. A defective shut-off valve must be replaced.
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