2000 GMC C3500 Repair Question
I have a dually 4x4 pick up truck when in park it wants to sugers on me and shoot black smoke.
may be a vacuum leak or a bad mass air flow. have it checked for codes and see what comes up.
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Probable causes of an engine running rich are as follows:
1.Excessive fuel pressure can be cause by restricted fuel return line
2.Defective Oxygen Sensors.
3.Leaking injectors and fuel pressure regulator.
4.Coolant temperature sensor out of calibration.
5.Restricted air intake system.
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