Reasons for delphi common rail injector exsessive off leak?

Reasons for delphi common rail injector exsessive off leak?

Reasons for delphi common rail injector exsessive off leak?

Posted: 10 Dec 2013 05:07 AM PST

Hello i own a transit connect 2002 TDCI, I have been having issues with long cranking times also low pressure fuel codes on the ecu. P1211 / P0251 (focus have the some injectors) Before i go spend lots of money on new injectors which seem to be the culprit, I removed mine and stripped them down. I brought some tec 2000 injector cleaner cleaned the nozzles and injectors thoroughly, i tested the nozzle by blowing fluid down the nozzle and i had even spray. now I've clean them i have more power when throttling but i still have excessive leak of, actually one of the injectors has improved. But what i would like to know, what parts or part causes the leak off??? the control valve? or Nozzle??? or both??? I'm looking to repair the injectors myself and would like help diagnosing the problem.

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