The glow plugs are located under the intake manifold.
If you have difficulty starting the engine, first measure the engine compression. If the compression value is low, the engine will not start at low temperatures.
The DDE control unit is equipped with a fault memory for the electrical parts of the diesel injection system. In OPEL workshops, fault codes can be read using a special device.
Checking glow plugs
For a thorough check (in a workshop environment) it is necessary to use an ammeter.
1. Remove the engine cover and the air intake pipe above the glow plugs.
2. Unscrew the connecting cables from the glow plugs (arrow).
3. Connect the voltage tester to the positive (+) battery terminal and test each glow plug.
4. If the LED lights up, the glow plug is OK.
5. If the LED does not light, the glow plug is faulty, replace it.
Removal
1. Remove the intake manifold.
2. Disconnect the cables (1 and 2), unscrew and visually inspect the glow plugs. Burnt glow plug tips are usually the result of faulty injectors. Such faults cannot be caused by damage in or on the glow plugs.
3. If a burnt glow plug is found (indicated by the arrow), it is not enough to just replace it. It is also necessary to check the injectors for injection pressure and tightness (in a workshop environment).
Installation
1. Screw in the glow plugs, tightening torque: 25 Nm.
Warning! The tightening torque must not be higher, as this may cause the glow plug to fail.
2. Connect the glow plug cable, tighten the nut with a torque of 5 Nm.
3. Screw the intake manifold to the cylinder head with a torque of 25 Nm, replace all seals.
4. Screw the oil filter housing support and the EGR pipe onto the intake manifold with a torque of 25 Nm.
5. Reinstall the engine cover and air intake manifold.
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