ISM, ISMe, and QSM11 – Engine Noise Excessive — Combustion Knocks

Symptom Tree  t048

This is symptom tree t048
Cause Correction

Refer to Engine Noise Diagnostic Procedures — General Information at the end of this section before using this symptom tree.

Ether starting aid is malfunctioning

Repair or replace the ether starting aids. Refer to the manufacturer’s instructions.


Injector is malfunctioning

Perform the single-cylinder cutout test. Replace the injectors as necessary. Refer to Procedure 006-026.


Overhead adjustments are not correct

Measure and adjust the overhead settings. Refer to Procedure 003-004.


Incomplete combustion (white smoke)

Refer to the Engine Smoke Excessive (White) symptom tree.

Last Modified:  19-Dec-2003