Symptom Tree
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Condition occurs only at idle |
Refer to the Engine Runs Rough at Idle symptom tree. |
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Engine is operating at low ambient temperature |
Check the shutters and engine compartment air. Refer to Procedure 101-015 (Operating the Engine) in Section 1. |
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Electronic fault codes are active |
For instructions on how to read active fault codes, refer to Procedure 101-007 (Electronic Controlled Fuel System) in Section 1 for fault code troubleshooting. If fault codes are active, contact a Cummins Authorized Repair Facility. |
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Fuel leak |
Check the fuel lines, fuel connections, and fuel filters for leaks using the combustible gas detector service tool. Refer to the OEM service manual. |
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Fuel grade is not correct for the application or the fuel quality is poor |
Operate the engine from a tank of high-quality fuel. Refer to Procedure 018-002 (Fuel Recommendations and Specifications) in Section V. |
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Air in the fuel system |
Check for air in the fuel system. Tighten or replace the fuel connections, fuel lines, fuel tank standpipe, and fuel filters as necessary. |
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Fuel inlet restriction |
Check for fuel inlet restriction. Contact a Cummins Authorized Repair Facility. |
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Overhead adjustments are not correct |
Adjust the overhead settings. Refer to Section Procedure 003-004 (Overhead Set) in Section 5. |
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| Contact a Cummins Authorized Repair Facility |
