mechanico

No codes. Checked continuity between wires from first 3 eups. With ecm unplugged. Have continuity between 2 and 3 also from number 1

Problem is im getting unburned fuel going out stack like the 3 are out of time.

Yes all are pumping fuel

have a 2001 mack rd dump truck with the e7 motor has the eup's. motor was running fine then the next day sitting out in the cold was started and it started to run rough. blowing white smoke. changed first 3 injectors same problem all 3 first cylinders 12 and 3 are cold out exhaust manifold. tried another computer same thing, disconnected jake brake too. the smoke is fuel coming out exhaust. but ran perfect the day before?

Hello. Working on a mack e7. Truck was running fine one day and parked overnight. The next morning when started up it ran rough and blowing smoke . White and it's fuel took a temp reading from each exhaust port and the first 3 are cold 50 deg while running the back 3 were 300 deg. Pulled head looked ok and plugged in another ecu same result. Anyone ever have this problem? Thanks for any input