Dropped #6&7 injectors Twice!

[00Wildcat]

I'm new to the board so sorry if i mess this first post up.
Anyway I completely dropped #4 injector about 6 months ago and sent all 8 injectors to a shop to be rebuilt (against all local diesel mechanics recommendations) they were suppose to install new barrels, plungers, tips and o-rings. I installed the 8 reman injectors ran a tank of fuel through it and it ran like poo, white smoke and way rich smelling from start and never cleared up. buzzed injectors 6 & 7 were bad. pulled them the tips were covered with burnt deposits. Installed 2 more remans from same place fired it up and still had miss not nearly as bad though. drove about 50 miles buzzed injectors and 6 wasn't quite as strong as rest but 7 sounded fine.
Ran about 3 tanks through it like that, it progressively got worse, until it quit on me last week. scaned and buzzed it 6 and 7 bad again and i think i got a 1209 code and 1211 code fuel system/oil pressure codes. and cam sensor. but got same codes before when it droped #4 and the cam sensor was fine and i tried a different cam senor and no luck.

this is a 2000 Van w/160,xxx miles, no mods, frequent oil changes, new fuel filter every 15,000, fresh air filters as needed 1 owner. Vans suck to wrench on about 4-6 hour job pulling and replacing both valve covers with an assistant.

[bigcountrysg]

Have you done cylinder contribution test. Have you ohm tested the harness to make sure it is good. Harness is a lot cheaper then injectors.

[00Wildcat]

I already had all 8 injectors rebuilt and they have warranty. I can't do contrabution test, it won't run. won't even smoke while cranking.

[szyd]

could be ICP or weak HPOP causing problems or maybe fuel pump. You have got to have good presures going to the injectors to keep them happy.

[badazzstroker]

yea sounds like weak hpop is making problems for your injectors.i would test for psi.

[00Wildcat]

pretty familar with the mechanics of what goes on with engines but not familar with the terms. what is ICP and HPOP?

[Motown Fire]

ICP is the sensor on the Drivers side head towards the front. Pull the plug and check for oil in the connection, should be dry. HPOP = High Pressure Oil Pump.