EXCESSIVE BLACK OR GRAY EXHAUST SMOKE (ENGINE AT NORMAL OPERATING TEMPERATURE).

TM 9-2320-364-34-1

2-10. ENGINE TROUBLESHOOTING (CONT).

4. EXCESSIVE BLACK OR GRAY EXHAUST SMOKE (ENGINE AT NORMAL

OPERATING TEMPERATURE).

INITIAL SETUP

References

Tools and Special Tools

TM 9-2320-364-10

Tool Kit, General Mechanic's

TM 9-2320-364-20

(Item 240, Appendix F)

TM 9-4910-571-12&P

Analyzer Set, STE/ICE-R (Item 15, Appendix F)

Cartridge, DDEC (Item 29, Appendix F)

Equipment Condition

Reader, Diagnostic (Item 180, Appendix F)

Engine OFF, (TM 9-2320-364-10)

Parking brake applied, (TM 9-2320-364-10)

Materials/Parts

Gasket (2) (Item 115, Appendix E)

Wheels chocked, (TM 9-2320-364-10)

Gasket (4) (Item 116, Appendix E)

Lockwasher (8) (Item 282, Appendix E)

START

KNOWN INFO

TEST OPTIONS

WARNING

Read WARNING

Unit Troubleshooting tasks

DDEC mode 10 test.

on Page 2-81

completed.

REASON FOR QUESTION

POSSIBLE PROBLEMS

Are injector response times

If injector response times are

correct?

incorrect, excess fuel may be

Injector response times

supplied to cylinders, causing

incorrect.

black exhaust smoke.

Injector pulse widths incorrect.

Injector timing faulty.

Blower bypass valve faulty.

Clogged cylinder air inlet ports.

Low air box pressure.

Replace faulty

injectors (Para 4-2).

Verify repair, go to

Step 7 of this Fault.

YES

2-80