02-26-2005, 02:28 PM
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#1
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AF Enthusiast
Join Date: Feb 2004
Location: Osceola Mills, Pennsylvania
Posts: 1,066
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How many O2 sensors?
I have a 98 ZR2 with the 4.3.The 8th digit of the VIN is a W.I'm looking for O2 sensors online.Online tells me that I will need 4(2 front & 2 back).I crawled under the truck and I see the 2 up front,but only 1 after the cat.So how many are there,3 or 4? 
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02-26-2005, 03:57 PM
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#2
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AF Fanatic
Join Date: Oct 2004
Location: Muskegon, Michigan
Posts: 2,835
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Re: How many O2 sensors?
3 for all i know, one post cat, and i beleve bank one and two
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02-27-2005, 12:25 AM
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#3
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AF Newbie
Join Date: Feb 2005
Location: Bethlehem, Pennsylvania
Posts: 8
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you have four dude, 3 on your y pipe, and the one right after the cat. you have one on each side of the y-pipe coming off the manifold, one about 1 foot before the cat, and the one right after the cat
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02-27-2005, 12:42 AM
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#4
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AF Fanatic
Join Date: Oct 2004
Location: Muskegon, Michigan
Posts: 2,835
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Re: How many O2 sensors?
Quote:
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Originally Posted by jchupella
you have four dude, 3 on your y pipe, and the one right after the cat. you have one on each side of the y-pipe coming off the manifold, one about 1 foot before the cat, and the one right after the cat
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why the hell did they put so many of them on there??? its waistful and more of a pain in our asses isnt it??
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02-27-2005, 06:12 AM
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#5
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AF Enthusiast
Join Date: Jun 2003
Location: Pittsburgh, Pennsylvania
Posts: 3,552
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Re: Re: How many O2 sensors?
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Originally Posted by dmbrisket 51
why the hell did they put so many of them on there??? its waistful and more of a pain in our asses isnt it??
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ODBII compliancy requires 3-4 02 sensors.
__________________
 
95 s10 Blazer, EGR Mod, ZQ8 Steering box mod, 99 Center console shifter mod and more... See everything at www.pghconsulting.net/teal
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02-27-2005, 08:06 AM
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#6
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AF Enthusiast
Join Date: Feb 2004
Location: Osceola Mills, Pennsylvania
Posts: 1,066
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Re: How many O2 sensors?
Quote:
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Originally Posted by jchupella
you have four dude, 3 on your y pipe, and the one right after the cat. you have one on each side of the y-pipe coming off the manifold, one about 1 foot before the cat, and the one right after the cat
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I have seen the 2 after the exhaust manifolds and the one after the cat.I'm going to crawl under it again and look for this one before the cat.
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02-27-2005, 03:17 PM
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#7
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AF Enthusiast
Join Date: Feb 2004
Location: Osceola Mills, Pennsylvania
Posts: 1,066
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Re: How many O2 sensors?
Confirmed,I only have 3.
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02-27-2005, 03:37 PM
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#8
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AF -Advisor
Join Date: Sep 2003
Location: Sudbury
Posts: 13,562
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Re: How many O2 sensors?
The one after the cat doesn't need to be replaced, it just monitors cat efficiency.
__________________
1995 Factory Blazer Service Manual for sale, PM if interested.
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02-27-2005, 03:38 PM
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#9
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AF Fanatic
Join Date: Oct 2004
Location: Muskegon, Michigan
Posts: 2,835
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Re: Re: How many O2 sensors?
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Originally Posted by movin2stereo
Confirmed,I only have 3.
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thats all i have ever found
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02-27-2005, 03:47 PM
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#10
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AF Enthusiast
Join Date: Feb 2004
Location: Osceola Mills, Pennsylvania
Posts: 1,066
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Re: How many O2 sensors?
Which one is referred to as bank one,that's the one tripping the code.
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02-27-2005, 03:47 PM
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#11
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AF Fanatic
Join Date: Oct 2004
Location: Muskegon, Michigan
Posts: 2,835
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Re: Re: How many O2 sensors?
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Originally Posted by BlazerLT
The one after the cat doesn't need to be replaced, it just monitors cat efficiency.
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so your saying i can cut the cat off with no problems?
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02-27-2005, 03:49 PM
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#12
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AF Enthusiast
Join Date: Feb 2004
Location: Osceola Mills, Pennsylvania
Posts: 1,066
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Re: Re: Re: How many O2 sensors?
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Originally Posted by dmbrisket 51
so your saying i can cut the cat off with no problems?
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I would like to know the answer to that question.I've done that in the past to other cars I've had.
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02-27-2005, 03:57 PM
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#13
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AF -Advisor
Join Date: Sep 2003
Location: Sudbury
Posts: 13,562
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Re: How many O2 sensors?
No, don't cut out the cat.
Does nothing for performance.
What I meant was that you don't need to replace the replace the post cat O2 sensor. You still leave it in there though.
Bank 1 is driver's side.
__________________
1995 Factory Blazer Service Manual for sale, PM if interested.
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02-27-2005, 06:32 PM
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#14
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AF Enthusiast
Join Date: Feb 2004
Location: Osceola Mills, Pennsylvania
Posts: 1,066
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Re: Re: How many O2 sensors?
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Originally Posted by BlazerLT
No, don't cut out the cat.
Does nothing for performance.
What I meant was that you don't need to replace the replace the post cat O2 sensor. You still leave it in there though.
Bank 1 is driver's side.
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Thanks. 
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02-27-2005, 06:57 PM
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#15
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AF Fanatic
Join Date: Oct 2004
Location: Muskegon, Michigan
Posts: 2,835
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Re: How many O2 sensors?
well yes i will get preformence out of it, mine was soooo plugged up b4 i switched to a high flow it was robbing me of all my power and gas mileage, i was just woundern if i would of cut it out, would it have been ok, instead of putting 180 into a highflow cat
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