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 TM 9-2815-220-24
ENGINE LOW IDLE ABNORMAL OPERATION
0009 00
MALFUNCTION 1: (Continued)
Low idle speed, below 650 rpm.
PROBABLE CAUSE
CORRECTIVE ACTION
c. (Continued) One bank not firing.
(2) Check inlet filter (watchdog) on fuel
injection pump (TM9-2910-212-34 & P).
MALFUNCTION 2:
Low-idle speed erratic (unsteady or surge).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Idle speed too low.
(1) Adjust idle speed (WP 0043, Throttle
Adjustments).
b. Accelerator or throttle linkage loose, worn,
(1) Inspect linkage (WP 0122, Throttle Control
or cross-shaft shock spring defective.
and Manual Fuel Shutoff Replace/Repair).
c. One or more cylinders partially firing.
(1) Refer to WP 0020, Fuel System Abnormal
(Water or air in fuel system).
Conditions.
d. Injector nozzles defective.
(1) Remove and check nozzles (WP 0114, Fuel
Injector Nozzle Replace/Repair).
e. Fuel-injection pump governor defective.
(1) Replace defective fuel-injection pump
Replacement).
f. Fuel injection-pump improperly timed.
(1) Check timing (WP 0036, Injection Pump
Timing).
MALFUNCTION 3:
Misfires at idle (usually accompanied by white exhaust smoke, oily or heavy carbon deposits
on exhaust grilles).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Engine operating at idle for extended period
(1) Increase engine idle speed to 1000 - 1200
during cold weather.
rpm.
END OF WORK PACKAGE
WP 0009 00-2
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