Engine Power Output Low

Size: px

Start display at page:

Download "Engine Power Output Low"

Mitchell Miles
5 years ago
Views:

1 File: t057-tr Page 1 of 5 STEP 1 Engine under excessive load STEP 2 Fuel shutoff lever (mechanical) partially engaged STEP 3 Engine will not reach full throttle STEP 4 Poor fuel quality or wrong fuel grade STEP 5 Fuel temperature is above specification STEP 6 Fuel leak STEP 7 Air in the fuel system Check for added loading from malfunctioning accessories or driven units, brakes dragging, and other changes in vehicle loading. Check for correct solenoid operation. Refer to Procedure in Section 5. Make sure the throttle linkage is not misadjusted or damaged. Adjust and repair as necessary. Check the fuel lever for stop-to-stop travel. Refer to the OEM service manual or the Operation and Maintenance Manual, Automotive, Recreational Vehicle, Bus, and Industrial B3.9 and B5.9 Series Engines, U.S.A., Canada, Australia, New Zealand, and Puerto Rico, Bulletin or Operation and Maintenance Manual, Automotive, Recreational Vehicle, Bus, and Industrial B3.9 and B5.9 Series Engines, Worldwide excluding U.S.A., Canada, Australia, New Zealand and Puerto Rico, Bulletin Verify by operating the engine from a temporary supply of number 2 diesel fuel. Check fuel specifications for proper fuel grade. Refer to Fuels For Cummins Engines, Bulletin Fill the fuel tanks. Verify the fuel heater is off during warm weather. Refer to the OEM service manual. Check the fuel lines, fuel connections, fuel delivery valve seals, and fuel filters for leaks. Check the fuel lines from the supply tank(s). Refer to the OEM service manual. Check for air in the fuel system. Repair source of leak and bleed air from the system. Refer to Procedure in Section 6.

2 File: t057-tr Page 2 of 5 STEP 8 Fuel filter or fuel inlet restriction STEP 9 Fuel drain line is restricted STEP 10 Fuel transfer pump malfunctioning Check the flow through the fuel filter. Replace the fuel filter if necessary. Refer to Procedure in Section 6. Clean all prefilters and screens. Check the fuel suction line for restriction. Check the fuel drain lines for restriction. Clear or replace the fuel lines, check valves, or tank vents as necessary. Refer to Procedure in Section 6. Inspect the fuel transfer pump. Replace if necessary. Refer to Procedure in Section 5. STEP 11 Fuel pump return overflow valve is malfunctioning Inspect the return overflow valve. Replace if necessary. Refer to Procedure in Section 6. STEP 12 Lubricating oil level is above or below specification Check the oil level. Add or drain oil, if necessary. Refer to Procedure in Section 7. STEP 13 Plugged air filter STEP 14 Intake air source is incorrect STEP 15 Air-fuel tube leaking, wastegate diaphragm ruptured, or wastegate plumbing damaged STEP 16 Intake air overheated Inspect the air cleaner element. Replace as needed. Refer to the OEM service manual. If the vehicle is equipped with a valve to switch the intake source from under the hood to outside, position and set valve for the season. Tighten the fittings, repair plumbing, replace wastegate diaphragm. Refer to Procedure in Section 10. Inspect and clean any debris from the front of the charge-air cooler. Refer to Procedure in Section 10.

3 File: t057-tr Page 3 of 5 STEP 17 Aftercooler restricted (if equipped) STEP 18 charge-air cooler restricted (if equipped) STEP 19 Intake and exhaust system restricted STEP 20 Closed crankcase ventilation hoses are leaking or damaged STEP 21 Close crankcase ventilation valve is leaking or malfunctioning STEP 22 Air leak between the turbocharger and the intake manifold STEP 23 Turbocharger is worn or malfunctioning STEP 24 Fuel injection pump timing is not correct Inspect for plugged passages in the aftercooler. Refer to Procedure Inspect the air cooler for internal and external restrictions. Replace the restricted cooler if necessary. Refer to Procedure in Section 10. Check the intake and exhaust systems for restrictions. Inspect the intake air filter and replace as necessary. Refer to Procedure in Section 10 or Procedure in Section 11. Inspect the closed crankcase ventilation system hoses and connections for leaks, obstruction, or damage. Refer to Procedure in Section 3. Inspect the closed crankcase ventilation valve for obstruction or damage. Refer to Procedure in Section 3. Check for leaks in the air crossover tube, charge-air cooler connections, hoses, or through holes in the manifold cover and repair or replace if necessary. Refer to Procedure , Procedure , and Procedure in Section 10. Check for the specified boost pressure. Inspect the turbocharger. Replace if necessary. Refer to Procedure in Section 10. Put the engine at top dead center. Check and adjust the fuel timing. Refer to Procedure , Procedure , or Procedure in Section 5.

4 File: t057-tr Page 4 of 5 STEP 25 Valves are not sealing correctly STEP 26 Injector sealing washer not correct STEP 27 Injectors worn or malfunctioning STEP 28 Engine compression is low STEP 29 Fuel injection pump is malfunctioning Check and adjust the valves. Refer to Procedure in Section 3. Check to see if an extra sealing washer is installed under injector. Remove any additional sealing washer. Only one is required. Refer to Procedure in Section 6. Check the injectors and replace any malfunctioning injectors. Refer to Procedure in Section 6. Perform the compression check to identify the malfunction. Correct as required. Refer to Procedure in Section 14. Remove the fuel pump. Refer to Procedure or Procedure in Section 5. Calibrate the fuel pump.

5 File: t057-tr Page 5 of 5

Oregon Fuel Injection

Oregon Fuel Injection Cummins PT Fuel Pump Diagnostic No Start, with no smoke 1. This could be caused by the fuel pump not turning or a seized gear pump. Remove the fuel supply hose and the fuel inlet fitting from the gear