Re: 1991 GMC runs poorly after engine is warm
On my 93 4.3 the O2 sensor is just before the cat on the passenger side. It was angled up toward the cab at about a 30* angle. I would assume yours should be in the same place if the PO didn't remove it. There should be a wire for it somewhere around that area too.
Mike
Also Welcome to the board!!
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2012 Chevrolet Silverado 1500 Z71 4WD
1993 Chevrolet C-1500 W/T - Blue - 4.3L V-6, 4 speed auto - Dad's (RIP)
1992 Chevrolet S10 - LS swap project
1968 Chevrolet C-10 longbed fleetside - sold
Last edited by 68haywagon; 12-24-2006 at 11:57 PM.
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