BASIC TROUBLESHOOTING 110 All information subject to change without notice.
DDC-SVC-MAN-0039 Copyright © 2009 DETROIT DIESEL CORPORATION Abnormal Engine Operation Symptoms and Probable Causes Probable Causes Rough Running or Frequent Stalling Low Power Detonation Misfiring cylinder X X — Insufficient fuel X X — High return fuel temperature X X — Low compression X X — DDEC malfunction X X — High air inlet restriction/ex- haust back pressure — X — Engine application — X — High air inlet temperature — X — High altitude operation — X — Incorrect engine gear train timing — X — Low coolant temperature — — X Oil picked up by inlet airstream — — X Faulty injector operation — — X Incorrect injector height setting — X X