Before proceeding with the test, in order to prevent damage to the injector coil, make sure that the connection for each injector is disconnected with the engine switched off and, once the test is over, switch the engine off again before reconnecting the connection.

In the event of noise or knocking coming from the injectors,

remove the injectors and refit them, inverting the position of injector pair 1-2 with injector pair 3-4.

Make sure that the housings for both injectors are clean (remove any carbon deposits from the copper washer seats)

Check that the injector bracket nut is tightened to the recommended torque of 2 daNm

If the fault has disappeared after this operation, the test is over

1) The noise can be heard on the new supply line. Move on to Step 2.

2) The noise persists even after having inverted the injectors. Move on to Step 3

Replace the injector shown to be faulty

Op. 1060F10

High pressure fuel supply circuit check

Carry out the

See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK

Low pressure fuel supply circuit check

Carry out the

See Test 1060OA LOW FUEL RETURN PRESSURE CIRCUIT CHECK

Fuel return circuit check

Carry out the

See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK

Check if the engine runs badly when idling (e.g. it runs with 3 cylinders)

Switch off the engine and disconnect the electrical connection for the first injector

Start the engine and check if there is a further variation in the idle speed

Repeat the operations described above for the remaining injectors

Check if the engine runs badly at speeds greater than idling

Switch off the engine and disconnect the electrical connection for the first injector

Start the engine and accelerate, without engine load, until the critical engine speed is reached when the injector starts knocking.

Repeat the operations described above for the remaining injectors

If the previous tests have not highlighted any faults, proceed according to the

See table S001 ENGINE KNOCK