TM-9-2320-272-23-1

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-1 - Page 330 of 1313

FIELD MAINTENANCE

ENGINE RUNS, BUT MISFIRES

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Personnel Required

(2)

References

Point to Point Schematics

TM 9-2320-272-10

Volume 2, WP

0225

References (cont.)

Volume 2, WP

0239

Volume 2, WP

0251

Volume 2, WP

0254

Volume 2, WP

0258

Volume 2, WP

0268

Volume 2, WP

0269

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

ENGINE RUNS, BUT MISFIRES

NOTE

Conduct these malfunction tests if engine misfires while running. This procedure will check

for fuel contamination, air intake system clogs or restrictions, proper working condition of

throttle linkage, fuel line damage, proper fuel supply pressure and engine compression

unbalance.

TM 9-2320-272-23-1

0012

0012-1