Variable Induction Control Valve: Service and Repair

Removing and Installing Tuning Pipe

Preliminary work

Preliminary work for removing tuning pipe
1. Disconnect the battery.
2. Remove air cleaner housing.

Removing tuning pipe

Throttle Body:

1. Remove distributor pipe. To do this, remove the fastening nut M6 of the throttle body from the rubber mount of the servo pump -2-.
2. Release cable plug on throttle body, and pull out and release cable -1-.
3. Release crankcase venting pipe connection from distributor pipe and remove -3-.

Distributor Pipe:

Tuning Pipe:

4. Loosen the four screw-type hose clamps on the rubber sleeves to the side intake distributors and push the rubber sleeves onto the distributor pipe -arrows-. Remove distributor pipe together with mounted throttle body. Remove distributor pipe from the engine compartment.

NOTE: Before removing tuning pipe, a mark should be made with a felt-tip pen on the intake distributor, rubber sleeve and tuning pipe so that the position for re-installation is correct.

5. Loosen the four screw-type hose clamps of the tuning pipe on the rubber sleeves to the side intake distributors -arrows- and push the rubber sleeves onto the intake distributor pipe as far to the side as possible.

Removing Tuning Pipe:

6. Pull tuning pipe out of the rubber sleeves and remove vacuum hose from the rear vacuum modulator of the resonance flap. Remove tuning pipe from the engine compartment.

Installing tuning pipe
1. Wipe out engine oil residues in the intake manifolds and sleeves with a cloth.

Removing Tuning Pipe:

2. Loosen the four screw-type hose clamps of the tuning pipe and push the rubber sleeves as far as possible onto the side intake distributors.

Tuning Pipe:

3. Guide tuning pipe between the intake distributors of both cylinder banks and connect vacuum line to the vacuum modulator of the tuning pipe. If necessary, clip vacuum line into the rear holder.

NOTE: Before removing tuning pipe, a mark should be made with a felt-tip pen on the intake distributor, rubber sleeve and tuning pipe so that the position for re-installation is correct.

4. Press tuning pipe between the side rubber sleeves and align with the marking. Make sure that the rubber sleeves and screw-type hose clamps are pushed equally onto the tuning pipe and intake distributors. Tighten screw-type hose clamps-arrows-.

Distributor Pipe:

5. Fit distributor pipe together with throttle body. To do this, push four screw-type hose clamps and the rubber sleeves onto the distributor pipe -arrows-. Guide distributor pipe together with mounted throttle body between the intake distributors. Align and tighten the rubber sleeves screw-type hose clamps.
6. Fit the crankcase ventilation line, cable plug and hexagon nut. Tightening torque 7.5 ftlb..

Subsequent work

Work subsequent to installing tuning pipe
1. Install air cleaner housing.
2. Connect the battery.