Sitting at the traffic lights, my P39 2.5 diesel stuttered and almost stalled whilst idling. This happened again on the motorway, a brief and sudden loss of power every few miles. Anyway, got it home then had a quick look. I drained some derv from the filter, thinking that there may be water in the derv. Looked ok. Then I noticed a slight leak from No 4 (4th from the front of engine) injector. Looks like a seal is fecked.

Musicmaker said:

Sitting at the traffic lights, my P39 2.5 diesel stuttered and almost stalled whilst idling. This happened again on the motorway, a brief and sudden loss of power every few miles. Anyway, got it home then had a quick look. I drained some derv from the filter, thinking that there may be water in the derv. Looked ok. Then I noticed a slight leak from No 4 (4th from the front of engine) injector. Looks like a seal is fecked.

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May be in tank pump. If injector 4 is leaking, it's likely fecked.

Seems to be running OK now except for the leaky injector