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(FVCV) Fuel pressure control valve (FPCV) Fuel injection pump failure Air leakage Crankshaft position (CKP) sensor ECM fault
Fuel Charging and Controls Check the fuel injection pump, Fuel Injection Pump For air intake system, Intake Air Distribution and Filtering Check the CKP sensor, Electronic Engine Controls Refer to the warranty policy and procedures manual if an ECM is suspect.
Difficult to start
Glow plug system fault (very cold conditions) Low/contaminated fuel Fuel pump module fault Low pressure fuel system fault Blocked fuel filter Fuel volume control valve (FVCV) Fuel pressure control valve (FPCV) Air leakage Exhaust gas recirculation (EGR) valve(s) fault
Check the glow plug circuits, Glow Plug System Check the fuel level/condition, Fuel Charging and Controls Check the fuel pump module operation, GO to Pinpoint Test G552807p8. Check the low pressure fuel system for leaks/damage, GO to Pinpoint Test G552807p9. Check the fuel filter, check the FVCV and FPCV, Fuel Charging and Controls For air intake system, Intake Air Distribution and Filtering For EGR tests, Engine Emission Control
Rough idle
Low/contaminated fuel Air ingress Low pressure fuel system fault Blocked fuel filter Fuel volume control valve (FVCV) Check the fuel level/condition, Fuel Charging and Controls Check the low pressure fuel system for leaks/damage, GO to Pinpoint Test G552807p9. Check the fuel filter, check the FVCV and FPCV, Fuel Charging and Controls For EGR tests, Engine Emission Control
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