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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).
4.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting tasks
Visual inspection.
on Page 2-85
completed.
Injector response times OK.
REASON FOR QUESTION
Injector pulse widths OK.
Does blower bypass valve
Injector timing OK.
A blower bypass valve stuck
move freely (not stuck open
open will reduce amount of air
or closed)?
supplied to cylinders, and may
POSSIBLE PROBLEMS
cause black or gray exhaust
Blower bypass valve faulty.
smoke.
Clogged cylinder air inlet ports.
Low air box pressure.
Replace blower
bypass valve
NO
(Para 4-7).
Verify repair, go to
Step 7 of this Fault.
YES
2-84
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