TM 5-3805-291-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 1. Engine Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. When the engine is not running, the
15. Use MSD to monitor the status of
15. Poor Acceleration or
correct intake manifold pressure is 0 psi
"Intake Manifold Pressure" and
Response - Continued.
(0 kPa).
"Atmospheric Pressure" for normal
2. If problem still exists, go to Test 16.
operation.
1. If signal is erratic, perform Throttle
16. Use MSD to monitor the status for
Position Sensor Circuit Test (WP 0013
"Throttle Position." Verify the status
for "Throttle Position" is stable and that
00).
the engine is able to reach high idle
2. If problem still exists, go to Test 17.
speed.
17. Use MSD to perform Injector Solenoid If problem still exists, go to Test 18.
Test. Determine if all injector solenoids
are being energized by the ECM and
correct as necessary. If not, perform
Injector Solenoid Circuit Test (WP
N OT E
It is not necessary to swap the injector trim files for this temporary exchange
of two injectors. Injectors must be properly installed and adjusted for this
test.
18. Use MSD to perform Cylinder Cutout
1. If misfire problem stays with the
Test. Identify any misfiring cylinders.
suspect injector, replace the suspect
Temporarily swap suspect injector
injector and install new trim file for it
from the misfiring cylinder with an
(WP 0187 00). The other good injector
injector from a cylinder that is not
that was moved must first be returned
misfiring (WP 0187 00). Repeat the
to its original position or its trim file
cylinder cutout test to determine
must be moved to its new location.
whether the misfire stays with the
2. If the cylinder cutout test indicates the
suspect injector or with the original
misfire continues to be in the same
cylinder.
cylinder, the suspect injector is not the
problem. Return the injectors to their
original position or move the trim files
to the new location. Investigate other
possible causes of misfire for the
problem cylinder, check valve lash
(WP 0179 00).
3. If problem still exists, go to Test 19.
19. Remove valve cover (WP 0024 00) and Make any necessary repairs.
oil pan (WP 0181 00). Check for worn
cam lobes, lifters, or push rods for the
misfiring cylinder. Check for
mechanical problems.
0008 00-17