Idle Speed Regulator — Removal and Installation (Opel Vectra A)

Note: Idle speed adjustment is not possible on models equipped with the Multec system, as it is controlled by the ECU. Please refer to Chapter 1.

Removal

Single overhead camshaft models (except for the Multec system)

1. Disconnect the negative cable from the battery.

2. Disconnect the wiring from the idle speed controller (see illustration).



3. The regulator can be removed together with the connecting hoses or separately, leaving the hoses in place.

4. Loosen the corresponding screws, then disconnect the hoses and remove the idle speed control valve (see illustration).

Models with two overhead camshafts

5. Disconnect the negative cable from the battery.



6. Loosen the screw, disconnect the hose from the bottom of the air block on the throttle body. Remove the clamp from the hose.

7. Apply the handbrake, then jack up the front of the vehicle and support it on axle stands placed under the sides of the body frame.

8. Remove the lower engine skid plate as described in Section 1.

9. Working under the vehicle, disconnect the wiring from the idle speed control valve, which is located between the intake manifold and the starter (see illustration).



10. Loosen the screw and disconnect the remaining idle speed control hose from the intake manifold, then pull the control down along with the hoses.

11. If the hoses need to be disconnected from the regulator, mark their location to avoid confusion when connecting.

Installation

12. Install in reverse order. On dual overhead camshaft models, ensure that the idle speed control valve is horizontal and that the wiring runs on top of the coolant hose.

If the wiring runs under the coolant hose, this may cause the regulator to move downwards, which may result in the air hose going to the intake manifold being broken.