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TM 10-3930-669-34
2-11. ENGINE SYSTEM TROUBLESHOOTING (CONT).
6. ENGINE RUNS ROUGH OR MISFIRES.
INITIAL SETUP
Tools and Special Tools
References
Tool Kit, General Mechanic’s: Automotive
TM 10-3930-669-10
(Item 1, Appendix E)
TM 10-3930-669-20
Pressure Test Kit (Item 5, Appendix E)
STE(Optional) (Item 14, Appendix E)
Retainer (Item 13, Appendix E)
Equipment Condition
Engine OFF (TM 10-3930-669-10)
MAIN POWER switch OFF (TM 10-3930-669-10)
Personnel Required
Parking brake applied (TM 10-3930-669-10)
Two
Wheels chocked (TM 10-3930-669-10)
Materials/Parts
Cap and Plug Set (Item 5, Appendix B)
Tags, Identification (Item 21, Appendix B)
KNOWN INFO
Nothing.
POSSIBLE PROBLEMS
Injection pump faulty.
Injection pump timing incorrect.
Low engine compression.
Cylinder head(s) or gasket(s)
faulty.
Camshaft faulty.
TEST OPTIONS
Injection pump pressure test.
REASON FOR QUESTION
If injection pump is faulty,
engine will run rough or misfire
WARNING
Read WARNING
on Page 2-53
Replace injection
(Para 4-5). Go to
Step 5 of this Fault
2-52
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