TROUBLESHOOTING
Page 91
ENGINE STALLS AT LOW SPEEDS
ERRATIC ENGINE SPEED
Possible Cause Correction
1. Code(s) present. 1. Correct cause of code(s).
2. Cylinder cutting out. 2. Isolate cylinder and determine cause of cutting out. Refer to item 8
in ENGINE MISFIRES — NO CODE(S) chart.
3. Idle speed set too low. 3. Check idle setting. Adjust as necessary.
4. High parasitic load. 4. Check for excessive loading due to engaged auxiliary attachments.
5. Fuel tank vent clogged or partially clogged. 5. Check fuel tank vents. Repair as necessary.
6. Low fuel supply. 6. Check for sufficient fuel in the fuel tank. Check fuel filters (including
the pre-pump filter screen), replace if necessary. Check fuel supply
lines for restrictions or air in the system. Check fuel return check
valve for free-moving poppet. Check fuel pressure and repair or
replace supply pump as required.
7. Defective fuel injection nozzle. 7. Isolate defective nozzle and replace. Refer to item 8 in ENGINE
MISFIRES — NO CODE(S) chart.
8. Defective unit pump. 8. Refer to item 8 in ENGINE MISFIRES — NO CODE(S) chart.
9. EGR valve stuck open. 9. With the engine running and EGR gases flowing, unplug the EGR
valve. The valve should close. If not, replace the valve.
Possible Cause Correction
1. Air leaks in fuel suction line. 1. Check for air leaks. Repair as necessary.
5-111.bk Page 91 Monday, July 10, 2006 2:26 PM
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