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if some leakage is normal even on new engines then I would assume that the effect one the cars performance would be negliable. You can actually observe bubbling around the junction of the head and the injector, the symptoms the car is suffering from is severe kangarooing ( similiar to missing on a petrol engine ) especially when under load (pulling away or uphill) it runs normaaly on flat cruising conditions and it is perfectly normal when the outside air temperature is extremely cold. are you saying the leaky injector would not cause thes symptoms if not what would. Thankyou for your help.