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

Kevin45 · 12-27-2006, 10:20 AM

You do not need an air pump. Most air pumps were on trucks on the west coast. If you see a plug in the exhaust pipe, this is where the O2 sensor should be. The thing is that you will need to find the wire that goes to it. I can take a picture of my '89 or '93 if you like to show which direction it is coming from.

Kevin

12-27-2006, 10:20 AM	#15
Kevin45 Registered User Join Date: Oct 2004 Location: Urbana, Ohio Posts: 591	Re: 1991 GMC runs poorly after engine is warm You do not need an air pump. Most air pumps were on trucks on the west coast. If you see a plug in the exhaust pipe, this is where the O2 sensor should be. The thing is that you will need to find the wire that goes to it. I can take a picture of my '89 or '93 if you like to show which direction it is coming from. Kevin __________________ '93 Silverado Reg. Cab Shortbox .060 over 350 Quick and fun!!!