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 TM 9-2815-220-24
ENGINE PERFORMANCE LOW
0019 00
POWER VERIFICATION: Perform engine "stall" test as follows: (Continued)
PROCEDURE
OBSERVATION
ANALYSIS
Repeat the preceding
Engine speed 1800-1950 rpm.
Engine power is
step, but operate
normal.
engine for 30 seconds.
Engine speed below 1800 rpm.
Power is below normal.
Engine speed above 1950 rpm.
Transmission is
slipping or fuel
injection pump is out of
adjustment.
PROBABLE CAUSE
CORRECTIVE ACTION
a. If stall speed is normal (1800-1950 rpm),
(1)
Investigate transmission clutches, brakes,
low performance is vehicle related or
and vehicle suspension for being too tight.
vehicle may be operating under severe
Repair as required (refer to pertinent vehicle
conditions.
technical manual).
(2)
Check vehicle performance on hard road;
and if performance is satisfactory, limit
vehicle operation under severe conditions to
short periods of operation. Possible engine
damage may be prevented.
b. If stall speed is above normal (more than
(1)
Investigate for transmission slippage (refer
1950 rpm) low performance is transmission
to vehicle technical manual).
related and engine is over-powered.
(2)
Replace fuel injection pump (WP 0115,
Fuel Injection Pump Assembly
Replacement).
MALFUNCTION 1:
Low stall with both banks firing and normal smoke.
PROBABLE CAUSE
CORRECTIVE ACTION
a. In-tank fuel pump inoperative.
(1)
Check in-tank fuel pump operation (refer to
pertinent vehicle manual). Repair as
required.
b. Throttle travel limited.
(1)
Inspect accelerator and throttle linkages
Fuel Shutoff Replace/Repair). (WP 0123
for 2DR)
c. Water contaminated fuel or improper fuel.
(1)
Check fuel system for water content
Conditions). Service as required (refer to
pertinent vehicle technical manual for
proper fuel specification).
d. Fuel filter restriction (dirty).
(1)
Inspect fuel filters (refer to pertinent vehicle
technical manual). Service filters as
required.
WP 0019 00-2
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