Changing O2 sensor on 85 vette. [Forums - C4 Technical]

C4 Technical > Changing O2 sensor on 85 vette.
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85L98-84L83	Changing O2 sensor on 85 vette.	#1
Guru Newb 113 Posts Member since: 2008/1/7 0:00	I was watching a show and they changed the o2 sensors on a truck just because of the milege on it. Would this help on a vette for performance and fuel economy? Should these o2 sensors be changed?
	Posted on: 2008/12/18 20:17
	_________________ 85 vette - 3.54 gears,pulleys,160 stat,hypertech chip,K&N,no cat,B&B cat back,cut air lid,TB bypass,air pump elim pulley,air foil,Torque thrust II wheels,maaco paint job 84 vette - K&N,renegade,2 inch TB's,adustable fuel pressure to 15 psi,air pump e...
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jsup	Re: Changing O2 sensor on 85 vette.	#2
Elite Guru 1778 Posts Member since: 2005/9/9 0:00	They are cheap. But typically unless you get a code, it will make no difference on performance.
	Posted on: 2008/12/18 20:22
	_________________ Parts don't make power, engines make power.
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CentralCoaster	Re: Changing O2 sensor on 85 vette.	#3
Senior Guru San Diego, CA 9454 Posts Member since: 2007/10/28 0:00	An o2 sensor has to stray pretty far before it throws a code, and it will effect performance before that. Supposedly they can be tested. If you're on your original, I would recommend changing it. What is your mpg on the freeway?
	Posted on: 2008/12/18 20:44
	_________________ 1985 Z51, ZF6
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Matatk	Re: Changing O2 sensor on 85 vette.	#4
Webmaster SW Chicago Burbs 22805 Posts Member since: 2008/1/7 0:00	I've never really looked in to it much, but your post made me wonder so I've been looking stuff up on the internet. Found a replacement schedule on a few automotive sites: Quote: OXYGEN SENSOR REPLACEMENT Any O2 sensor that is defective obviously needs to be replaced. But there may also be benefits to replacing the O2 sensor periodically for preventative maintenance. Replacing an aging O2 sensor that has become sluggish can restore peak fuel efficiency, minimize exhaust emissions and prolong the life of the converter. Unheated 1 or 2 wire wire O2 sensors on 1976 through early 1990s vehicles can be replaced every 30,000 to 50,000 miles. Heated 3 and 4-wire O2 sensors on mid-1980s through mid-1990s applications can be changed every 60,000 miles. On OBD II equipped vehicles (1996 & up), a replacement interval of 100,000 miles can be recommended. Guess it's time to replace mine since I'm sure it's the original one. Can't hurt for what, $25? Matthew PS - I read you have to coat the threads with conductive anti-seize before installing the new one.
	Posted on: 2008/12/18 22:39
	_________________ 2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP
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Matatk	Re: Changing O2 sensor on 85 vette.	#5
Webmaster SW Chicago Burbs 22805 Posts Member since: 2008/1/7 0:00	Thought I'd update. I picked up a new O2 sensor at autozone yesterday since I was out. Paid $23 with tax and everything. Found them on ebay for about $21 shipped so I don't feel bad about that. Came with the anti-seize on the threads already. Matthew FYI - Bosch #12014, oem replacement. I didn't feel like splicing the wire, this one came with the plastic adapter already on it.
	Posted on: 2008/12/23 19:08
	_________________ 2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP
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85L98-84L83	Re: Changing O2 sensor on 85 vette.	#6
Guru Newb 113 Posts Member since: 2008/1/7 0:00	Does the 85 vette have one or two O2 sensors? Anybody know the part number?
	Posted on: 2008/12/23 23:11
	_________________ 85 vette - 3.54 gears,pulleys,160 stat,hypertech chip,K&N,no cat,B&B cat back,cut air lid,TB bypass,air pump elim pulley,air foil,Torque thrust II wheels,maaco paint job 84 vette - K&N,renegade,2 inch TB's,adustable fuel pressure to 15 psi,air pump e...
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Jeffvette	Re: Changing O2 sensor on 85 vette.	#7
Elite Guru Not on CF 1297 Posts Member since: 2007/12/29 0:00	Quote: 85L98-84L83 wrote: Does the 85 vette have one or two O2 sensors? Anybody know the part number? Delco AFS21 requires only 1.
	Posted on: 2008/12/23 23:22

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Schrade	Re: Changing O2 sensor on 85 vette.	#8
Elite Guru eastern NC / e-i-e-i-o 1909 Posts Member since: 2008/8/15 2:01	Quote: jsup wrote: They are cheap. But typically unless you get a code, it will make no difference on performance. Yup. If your tune is good, you don't even NEED an O2 nope. BUT, if you've been runnin' with a bad burn, and some heavy carbon fouling is left on the sensor heads, it might need a toothbrush goin' through the grooves to clean it. Even then, you gotta' make sure the burn is right first...
	Posted on: 2008/12/24 5:18
	_________________ LT5, Marc Haibeck ECM module, AUTOMATIC!!!
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