Poor Starting Low Compression Low Cranking Speed   • fuel shut off   • piston blow by   • wrong viscosity oil   • throttle closed   • dry cylinder walls   • worn bearings   • lift pump diapram holed   • valve blow by   • auxiliary gear engaged   • plugged fuel filters   • decompressors levers on   • battery loose   • air in fuel lines   • valve clearances wrong     • no fuel   • blown head gasket Knocks   • dirty fuel   • worn bearings   • air in fuel lines   • defective injectors     • dirty fuel   • poor fuel quality Lack of Fuel   • defective injectors   • injection pump leaking by   • throttle closed   • poor fuel quality   • injection timing advanced   • lift pump diapram holed   • injection timing advanced   • piston blow by   • plugged fuel filters     • dry cylinder walls   • air in fuel lines White Smoke   • valve blow by   • no fuel   • air in fuel lines   • decompressors levers on   • dirty fuel   • dirty fuel   • valve clearances wrong   • injection pump leaking by   • piston blow by   • valves sticking in guides     • dry cylinder walls   • plugged air filter Black Smoke   • valve blow by   • plugged exhaust / turbo   • air in fuel lines   • decompressors levers on   • kink in exhaust hose   • dirty fuel   • valve clearances wrong   • blown head gasket   • defective injectors   • valves sticking in guides   • cracked head   • injection timing advanced   • blown head gasket   • worn bearings   • too much fuel injected     • seized piston   • plugged air filter Blue Smoke   • auxiliary gear engaged   • engine overload   • piston blow by   • battery loose     • unburnt fuel       • burnt lubricating oil     TOP | Page 1 | Page 2