The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1991 GMC runs poorly after engine is warm

willymakeit · 12-24-2006, 02:37 PM

Thanks for the welcome chevytech ......

Yes the light never made a appearance until the problems started. I've looked in several places for the o2 sensor without finding it. Is it possible it doesn't have one? Where else might have they have installed this rascal? Also, is it possible that even though the code says O2, that something else could be the main culprit ......

Like I said in the earlier post, I'm not exactly a pro at this mechanic thing but have puttered around with several other different vehicles. This is the first PU I've ever owned, but it just seemed a little odd that when I 1st popped the hood that I could actually see the engine without a lot of the usual clutter and controls you see under the hood now-a-days. Reminded me a little of the cars back from the mid to late 70's.

12-24-2006, 02:37 PM	#3
willymakeit Registered User Join Date: Dec 2006 Location: kansas Posts: 7	Re: 1991 GMC runs poorly after engine is warm Thanks for the welcome chevytech ...... Yes the light never made a appearance until the problems started. I've looked in several places for the o2 sensor without finding it. Is it possible it doesn't have one? Where else might have they have installed this rascal? Also, is it possible that even though the code says O2, that something else could be the main culprit ...... Like I said in the earlier post, I'm not exactly a pro at this mechanic thing but have puttered around with several other different vehicles. This is the first PU I've ever owned, but it just seemed a little odd that when I 1st popped the hood that I could actually see the engine without a lot of the usual clutter and controls you see under the hood now-a-days. Reminded me a little of the cars back from the mid to late 70's.