Injectors are from a bmw 330d with the newer 3.0 m57n engine (don't shoot me, its still a derv 
)... Two injectors are suspected as having excess leak off causing the rail pressure to drop. I'm yet to double check but it is also possible some diesels getting into the sump which fits..
The car doesn't fire up, unless easy start is used which makes sense as it cranks the engine over faster than the starter, raising the pressure over the high (think its ~500bar) threshold required. Have to give it accelerator or it stalls. On warming up, obviously leak off will greater so it appears to miss a slight amount. I'm still waiting for my fancy bmw diagnostics to turn up so that i can check all this shit out but after having eliminated the in line pump and two pick up pumps in the tank.. the injectors are most suspect.. No actual fault codes to record, no eml on either so doubtful its the cam/crank sensors or rail pressure sensor? Can only truly rule them out after my reader turns up (inpa/ediabas if anyones interested!)
SOOO, my question
What is most likely to cause the excessive leakage on crd injectors? Is it simply wear internally in the nozzle? Or could it be a simple seal and dirt issue? Most likely option is to refurb all 6 with new bosch nozzles ... BUT, if its not much more expensive i am planning on fitting 535d nozzles - think they amount to under £500 a set if using my own injector bodies.. If its as simple as opening up my injectors now and shoving the nozzles/body into an ultrasonic bath then i'd give it a shot! Milleage is under 100k!
anyways.. enough of the essay. cheers
)... Two injectors are suspected as having excess leak off causing the rail pressure to drop. I'm yet to double check but it is also possible some diesels getting into the sump which fits..The car doesn't fire up, unless easy start is used which makes sense as it cranks the engine over faster than the starter, raising the pressure over the high (think its ~500bar) threshold required. Have to give it accelerator or it stalls. On warming up, obviously leak off will greater so it appears to miss a slight amount. I'm still waiting for my fancy bmw diagnostics to turn up so that i can check all this shit out but after having eliminated the in line pump and two pick up pumps in the tank.. the injectors are most suspect.. No actual fault codes to record, no eml on either so doubtful its the cam/crank sensors or rail pressure sensor? Can only truly rule them out after my reader turns up (inpa/ediabas if anyones interested!)
SOOO, my question
What is most likely to cause the excessive leakage on crd injectors? Is it simply wear internally in the nozzle? Or could it be a simple seal and dirt issue? Most likely option is to refurb all 6 with new bosch nozzles ... BUT, if its not much more expensive i am planning on fitting 535d nozzles - think they amount to under £500 a set if using my own injector bodies.. If its as simple as opening up my injectors now and shoving the nozzles/body into an ultrasonic bath then i'd give it a shot! Milleage is under 100k!
anyways.. enough of the essay. cheers
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Dturbo GT2259s build thread;
http://306oc.co.uk/forum/thread-3692.html
Daily driver; 330d Msport (doesn't blow up!)