Intake Manifold: Service and Repair

Removing and Installing Intake Air Manifold (M52TU)
- Refer to Instructions For Disconnecting And Connecting Battery. Service and Repair
- Disconnect negative battery lead.



- Remove cover from fuel injectors.



Caution: Do not mix up oxygen monitor sensors for cylinders 1 to 3 and 4 to 6 at plug connection to wiring harness. Mark plug connections.
- Unclip plug connections (1) from holder.
- Detach retainer (2) from battery positive lead.



- Disconnect plug connection (1) on VANOS solenoid valve.
- Detach vent hose (2) from cylinder head cover.



- Detach retainer (1).
- Disconnect plug connection (2) for intake air temperature sensor.
- Detach terminal strip (3) from fuel injectors and lay to one side.



- Disconnect plug connection (1) on tank venting valve.
- Detach tank venting valve from holder (2) on manifold.



- Unclip fuel hoses and cable for terminal strip from holder (1) on manifold.
Caution: Catch and dispose of fuel as it escapes.
- Instructions for removing and installing fuel hoses. Service and Repair
- Unlock fuel feed line (2).
- Unlock fuel return line (3).
- Release guide tube for dipstick.
- Press lock and detach return line from oil dipstick guide tube.
- Remove throttle assembly. Service and Repair
- Disconnect plug connections and lay cable duct to one side.



- Unclip plug connection (1) for knock sensors from holder.
- Release nut (2) on manifold support.



- Release nuts on manifold.
- Remove intake air manifold.

Installation



- Check gaskets on all cylinders and replace if necessary.



- Check rubber dampers and if necessary replace together with manifold support.