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Page Title:
EXCESSIVE BLACK OR GRAY EXHAUST SMOKE (ENGINE AT NORMAL OPERATING TEMPERATURE). (Cont) |
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 TM 9-2320-364-34-1
4. EXCESSIVE BLACK OR GRAY EXHAUST SMOKE (CONT).
2.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting tasks
DDEC mode 11 test.
on Page 2-83
completed.
Injector response times OK.
REASON FOR QUESTION
Are all of the injector pulse
POSSIBLE PROBLEMS
Pulse widths less than the base
widths equal to or greater
pulse width or different than
than the NO CUT OUT PW
other injector pulse widths
Injector pulse widths incorrect.
indicate that injector is faulty.
(pulse widths)?
Injector timing faulty.
A misadjusted injector will cause
Blower bypass valve faulty.
black or gray exhaust smoke.
Clogged cylinder air inlet ports.
Low air box pressure.
Replace injector
(Para 4-2).
NO
Verify repair, go to
Step 7 of this Fault.
YES
3.
KNOWN INFO
TEST OPTIONS
Unit Troubleshooting tasks
Injector timing check.
Is injector timing within
completed.
specification?
Injector response times OK.
REASON FOR QUESTION
Injector pulse widths OK.
Improperly timed injectors will
POSSIBLE PROBLEMS
cause fuel to burn unevenly and
may cause black or gray exhaust
Injector timing faulty.
smoke.
Blower bypass valve faulty.
Clogged cylinder air inlet ports.
Low air box pressure.
Tune-up engine
(Para 3-2).
NO
Verify repair, go to
Step 7 of this Fault.
YES
2-82
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