Volkswagen Golf/Jetta 2 manual

Fuel injector - testing, removal and refitting
Fuel and exhaust systems - Mono Jetronic fuel injection / Fuel injector - testing, removal and refitting


Testing
1 Run the engine up to its normal operating temperature, then detach and remove the air inlet duct from the top of the injector unit.

2 With the engine running at idle speed, look into the top of the injector unit and check the fuel spray pattern which should be visible on the throttle valve.

3 Increase the engine speed to 3000 rpm then snap shut the throttle and check that the fuel spray from the injector is momentarily interrupted. Turn the ignition off and then check that no more than two drops of fuel per minute leak from the injector. This indicates that the overrun cut-off is functioning in a satisfactory manner.

Removal
4 Remove the inlet duct and manifold.

5 Undo the retaining screw and lift clear the injector holder and O-ring seal from the top of the injector. Note its orientation, then grip and pull the injector from its location in the housing. Remove the O-ring seals (see illustration).

7.5 Injector unit and upper body components
7.5 Injector unit and upper body components

1 Screw
2 Injector holder
3 Protector cap
4 O-ring
5 Injector
6 Stud
7 Injector upper body
8 Gasket
9 Screw
10 Pressure regulator
11 Fuel pipe adapter
12 Seal ring
13 Connector

Refitting
6 Refit in the reverse order of removal. The O-ring seals must be renewed and lightly lubricated prior to fitting.


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