TM 5-3805-290-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 1. Engine Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
16. Use MSD to observe signal for throttle
1. If signal is erratic, perform Digital
3.
Engine Misfires, Runs
position sensor.
Throttle Position Sensor Circuit Test
Rough, or is Unstable -
Continued.
2. If problem still exits, perform Fuel
Injection Pump Circuit Test (WP 0013
1. Isolate source of noise. Remove
1. If damaged, replace engine
4.
Mechanical Noise (Knock)
accessories.
suspect engine accessories. Inspect
in Engine.
suspect engine accessories.
2. If problem still exists, go to Test 2.
2. Remove valve cover (WP 0024 00) and 1. If damaged, replace rocker arms, shaft
(WP 0156 00), or cylinder head (WP
inspect valve train and cylinder head
0146 00).
for obvious signs of damage.
2. If problem still exist, replace engine
(WP 0145 00).
1. Perform Fuel Quality Test (WP 0011
1. Remove unsatisfactory fuel from tank
5.
Noise Coming from
(WP 0166 00). Install new fuel filters
Cylinder.
(WP 0036 00). Use proper grade of
clean fuel in fuel tank.
2. If problem still exists, go to Test 2.
2. Perform Fuel Injector Nozzle Test (WP 1. If not operating as specified in test
0163 00).
procedure, replace fuel injector
nozzle(s).
2. If problem still exists, go to
Malfunction 7, Excessive Valve Lash in
this work package.
1. Start and run engine through speed
1. Replace damaged or missing parts and
6.
Engine Vibration.
range (TM 5-3805-290-10). Check
tighten any loose bolts.
engine mounts for any of these
2. If problem still exists, go to Test 2.
conditions: loose engine supports,
loose or broken mounting brackets,
loose bolts, or omitted bolts (WP 0145
00).
2. Perform Cylinder Balance Test (WP
If there is not a reduction in engine speed
then there is a problem with that cylinder.
Go to Test 3.
3. Check valve lash (WP 0155 00).
1. Adjust valve lash as necessary.
2. If problem still exists, go to Test 4.
4. Perform Compression Test (WP 0010
1. If compression on one or more
cylinders is low, replace engine (WP
0145 00).
2. If compression is OK or if problem still
exists, go to Test 5.
