TM 5-2420-230-24-2
3.9 and B5.9 Series Engines
Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms
Page TS-75
Smoke, Black -- Excessive
This is symptom tree T116.
Cause
Correction
Engine is being lugged down
.......
Use lower gear.
OK
P
Inspect the air cleaner element. Replace as
lugged air filter
.......
needed. Refer to the OEM service manual.
OK
I
If the vehicle is equipped with a valve switch
ntake air source is incorrect
.......
the intake source from under the hood to
outside, position and valve for the season.
OK
I
Inspect and clean any debris from the front of
ntake air overheated
.......
the charge-air cooler. Refer to Procedure
010-024.
OK
A
Inspect for plugged passages in the after-
ftercooler restricted (if equipped)
.......
cooler. Refer to Procedure 010-001.
OK
E
Check the exhaust system for any restrictions.
xhaust system restriction
.......
Refer to Procedure 011-009.
OK
C
Inspect the CAC for air restrictions or leaks.
harge-air cooler (CAC) is restricted or leaking
.......
Refer to Procedure 010-027.
OK
A
Check for leaks in the air crossover tube,
charge-air cooler connections, hoses, or
ir leak between the turbocharger and the
.......
intake manifold
through holes in the manifold cover and repair
or replace if necessary. Refer to Section 10.
OK
B
(Continued)
L-659
