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Servicing Motronic injection system
Removing and installing injectors
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‒ Disconnect wiring and unplug connectors for the following components:
- - Injectors -N30, -N31, -N32, -N33
- - Intake air temperature sender -G42
- - Hall sender -G40
- - Throttle valve control part -J338
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‒ Unscrew retaining bolts for fuel rail.
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‒ Pull fuel rail together with injectors off intake manifold and place it on a clean cloth at the back of the engine compartment.
Warning
Fuel system is under pressure. Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.
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‒ Take off retaining clip and remove injector.
Note:
To install a new fuel rail, first disconnect the fuel hoses.
Installation is carried out in the reverse order. When doing this, note the following:
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● Renew the O-rings at all opened connections. (When renewing the front O-ring, make sure not to remove the plastic cap from the injector head. The O-ring must be pulled off over the plastic cap.)
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● Moisten the O-rings with clean engine oil.
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● Make sure that the injectors are installed in the correct positions.
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● Check to make sure that the retainer clamps are properly seated.
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● Position fuel rail together with injectors (properly secured) against intake manifold and press into place evenly all round.
Tightening torque
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Component
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Nm
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Fuel rail to intake manifold
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10
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