Does a Federal 85 K1500 have O2 Sensor? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rob1 · 05-03-2011, 03:20 PM

I've seen some conflicting opinions about this, and wonder what the definitive answer is? The wiring diagram I have shows an O2 sensor, but I'm not certain it's showing the federal version. There's not even a hole in the downtube for the sensor on the car, although there is a suspicious-looking cut purple/dark blue wire running up from around the tranny, toward the firewall.

BTW, the car seems to run rich, which led me to look at (well, for) the O2 sensor. Suspect the carb needs a rebuild, in any case.

RandyP · 05-03-2011, 03:37 PM

Here's my guess, they did not put o2 sensors in until the TBI came out in 87. Although 86 was sort of a bastard year engine wise, so I'm not 100%. But I'm fairly confident your 85 would not have one.

*scottsdaleowner75* · 05-03-2011, 03:44 PM

Check your engine decal. Federal standards were usually much looser than CA standards.

Rob1 · 05-03-2011, 06:23 PM

You're correct! There's no evidence of an O2 sensor on the diagram. I hadn't realized they were still building vehicles that way in the mid '80s. Guess it's because it's a truck. Well, at least that's one potential trouble spot eliminated.

05-03-2011, 03:20 PM	#1
Rob1 Registered User Join Date: May 2011 Location: Redmond, WA Posts: 2	Does a Federal 85 K1500 have O2 Sensor? I've seen some conflicting opinions about this, and wonder what the definitive answer is? The wiring diagram I have shows an O2 sensor, but I'm not certain it's showing the federal version. There's not even a hole in the downtube for the sensor on the car, although there is a suspicious-looking cut purple/dark blue wire running up from around the tranny, toward the firewall. BTW, the car seems to run rich, which led me to look at (well, for) the O2 sensor. Suspect the carb needs a rebuild, in any case.

05-03-2011, 03:37 PM	#2
RandyP Getting Old; Going Broke Join Date: Apr 2010 Location: Owasso OK Posts: 2,764	Re: Does a Federal 85 K1500 have O2 Sensor? Here's my guess, they did not put o2 sensors in until the TBI came out in 87. Although 86 was sort of a bastard year engine wise, so I'm not 100%. But I'm fairly confident your 85 would not have one. __________________ *Why is every used 350 sbc out of a corvette?* There's only two things that excite a man, expensive toys and real expensive toys. *VEGETARIAN: That's an old Indian word meaning "I don't hunt so good."* When the going gets tough, switch to power tools.

05-03-2011, 03:44 PM	#3
scottsdaleowner75 Account Suspended Join Date: Mar 2010 Location: So. Cal, Inland Empire Posts: 199	Re: Does a Federal 85 K1500 have O2 Sensor? Check your engine decal. Federal standards were usually much looser than CA standards.

05-03-2011, 06:23 PM	#4
Rob1 Registered User Join Date: May 2011 Location: Redmond, WA Posts: 2	Re: Does a Federal 85 K1500 have O2 Sensor? You're correct! There's no evidence of an O2 sensor on the diagram. I hadn't realized they were still building vehicles that way in the mid '80s. Guess it's because it's a truck. Well, at least that's one potential trouble spot eliminated.



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