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2002 GMC SIERRA
V8
4WD
AUTOMATIC
75,000 MILES

2002 gmc sierra 4.8 litre bank 1 firing ok bank 2 all 4 plugs are black. Checked coils and injecters ok. What could be the problem?

Tuesday, February 15th, 2011 AT 2:25 AM

1 Reply

PROTECH1980

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Is there a check engine light on? If so I would get it scanned and start my diagnosis there. Sounds like a possible o2 sensor problem but without knowing any trouble codes its hard to say. Hope this helps

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