1994 Nissan Maxima Car problem

1994 NISSAN MAXIMA
160,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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BAILEY 1031
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Change fuel injector all 6 and when I start up lots of black smoke come through the tail pipe and when I check the spark plug They are also black. What could b the cause
Jun 4, 2015 at 2:14 PM
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WRENCHTECH
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Why were the injectors changed?

Did you have the problem before that?

Jun 4, 2015 at 3:32 PM