Question about 2005 Chevrolet Silverado

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2005 silverado..5.3...motor idle rough.. getting 3 codes

Ok.. here we go.. engine is idleing rough blows black smoke when motor is revved up..poor gas mileage.. and get 3 codes coming up..and they r PO171 PO174 and PO300.. i changed the o2 sensor on bank1 didnt help..any suggestions??..

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  • terickster21 Aug 11, 2009

    changed both o2 sensors on right and left side...runs fine now..

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P0171 and o0174 is lean replace intake gasket they will be a teal color,the old ones are red. i work for chevrolet.this is a common problem

Posted on Feb 12, 2009

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