Diagnostic Information Engine Misfires Or Runs Irregularly JC89288,000005D –19–29APR06–1/1 TM2361 (24JUN08) 9010-15-5 450DLC Excavator Operation and Tests 062608 PN=275 Engine Misfires Or Runs Irregularly Diagnostic Procedure Misfiring means that after starting, the engine runs with at least one cylinder functioning improperly. Vibrations, power drop and no smoke are observed. Irregular running means that abnormal vibrations, abnormal running, and black smoke are observed during acceleration at full load conditions and between 1200 to 1500 rpm. Before using this diagnostic procedure check for any active DTCs using the application error code display system.
– – –1/1 9010 15 5 1 Possible causes The following items could cause or be mistaken as miss/rough running: 1. Transmission problems. 2. Engine accessories such as A/C cycling on and off. 3. Electromagnetic interference (EMI) from improperly installed radios, etc. 4. Intake manifold air leaks. 5. Fuel system problems (presence of air or water). 6. Engine mechanical problems. 7. Check for excessive load applied to machine. Are any major visible signs noticed? YES: Repair or replace parts as needed and retest. NO: Go to Recreate Conditions. – – –1/1 2 Recreate Conditions Operate engine under conditions where miss or rough running complaint occurs. Could the problem be duplicated? YES:
Go to Active DTC Check. NO: Problem could not be duplicated. Verify complaint and try to reproduce conditions of miss/rough running again. – – –1/1