DIESEL HARD START,EXCESS SMOKE RESTRICTED FUEL SUPPLY

Poor starting (good cranking speed but limited ignition) and excessive smoke after start up can be the result of a restricted fuel supply. This can be misdiagnosed as a glow plug system condition. This restriction most likely will be from a plugged fuel filter but can also be caused by a pinched or kinked fuel line. After the engine warms up, it generally will run satisfactorily. If the restriction gets progressively worse, top speed and performance will be affected also.

Even though the filters may have relatively few miles, purchase of dirty fuel can plug the filters in a short time. A check of the fuel lines for restrictions should also be made.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.