Go Back   Blazer Forum - Chevy Blazer Forums > Mechanical & Maintenance > Engine & Transmission
Sign in using an external account
Register Forgot Password?
Search


Welcome to Blazer Forum!
Welcome to Blazer Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to start new topics, reply to conversations, privately message other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Blazer Forum today!


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 02-06-2012, 07:44 PM
ComputerNerdBD's Avatar
Senior Member
2007 Chevrolet TrailBlazer
My Garage
 
Join Date: Jan 2009
Location: Eastern Central New York State
Posts: 996
ComputerNerdBD is on a distinguished road
Default Oxygen sensor replacement

Hey everyone. I have almost 114k on this truck and my gas mileage sucks (even with a light load, fresh tune up, good gas, Techron, Mobil1, intake, light on the pedal, etc). The conditions are near perfect for higher MPG). I have reason to believe that it may be the O2 sensors since they are original and may be providing bad data, but not an open, short or out of range. I just got a great deal on 2 of them on Amazon.com ($26.28 each) and I plan to replace the front 2 to start. Now I have a few questions:

1. What is the best way to get them out without damaging the pipe or the threads? I have PB Blaster. Good idea (when the pipes are cool of course)?

2. Do stores normally have O2 Sensor sockets to loan me?

3. What is the purpose of the last sensor? I found 3 on this truck (one on each header and one between the cat and the muffler). From what I understand only the front 2 control the fuel/air mixture, so I am replacing those first to see if things improve.

4. How do I get the connectors unplugged? They look very complex. Do I put anything on the contacts to prevent corrosion?

5. Do I do anything with the computer after the sensors are in? Do I erase the I/M data or unhook the battery?

Thanks
__________________
2007 Chevy Trailblazer LT (22,000 Miles)
Mods: PCM of NC Transmission cooler, Interior LEDs

1998 GMC Jimmy 4x4 SLT (128,000 Miles)
Mods: Eurotails, Cold Air Intake, B&M transmission cooler, Throttle Body Spacer, Posi-Lok, interior LEDs
Reply With Quote
  #2  
Old 02-06-2012, 08:06 PM
BF Veteran
1999 Oldsmobile Bravada
 
Join Date: May 2011
Location: SW Central OH
Posts: 2,252
pettyfog is a jewel in the roughpettyfog is a jewel in the roughpettyfog is a jewel in the rough
Default

No.. spray on the PB carefully when the pipes are very warm, not too hot to touch at all but too hot to hang onto.

Let it soak a few minutes then run the truck a while.

Chqange the O2's while pipes are as warm as you can stand it.
Call autozone and O'reilly;s and ask about the tools.


Yeah.. you gotta helluve deal.. not! Rockauto:

DELPHI Part # ES20317 Click the image to open in full size.
Wrench Size: 7/8 in.; Actual OE PartClick the image to open in full size.
$34.79

The third one has NOTHING to do with mixture
__________________
Taking a long hiatus; totally unrelated blather at....

99 Bravadiva - She's SUCH a Good Girl.
Reply With Quote
  #3  
Old 02-06-2012, 08:16 PM
Little Roober's Avatar
Junior Member
1996 GMC Jimmy
 
Join Date: Feb 2011
Location: Southeast Michigan
Posts: 361
Little Roober is on a distinguished road
RubyDew
Default

Quote:
Originally Posted by ComputerNerdBD View Post
Amazon.com ($26.28 each)
<
Quote:
Originally Posted by pettyfog View Post
Yeah.. you gotta helluve deal.. not! Rockauto:
$34.79
__________________
1996 Jimmy SLT 4 Door 4X4
Vortec 4.3 V6
90,XXX Miles
Vin W
Reply With Quote
  #4  
Old 02-06-2012, 08:32 PM
ComputerNerdBD's Avatar
Senior Member
2007 Chevrolet TrailBlazer
My Garage
 
Join Date: Jan 2009
Location: Eastern Central New York State
Posts: 996
ComputerNerdBD is on a distinguished road
Default

Quote:
Originally Posted by pettyfog View Post
No.. spray on the PB carefully when the pipes are very warm, not too hot to touch at all but too hot to hang onto.

Let it soak a few minutes then run the truck a while.

Chqange the O2's while pipes are as warm as you can stand it.
Call autozone and O'reilly;s and ask about the tools.


Yeah.. you gotta helluve deal.. not! Rockauto:

DELPHI Part # ES20317 Click the image to open in full size.
Wrench Size: 7/8 in.; Actual OE PartClick the image to open in full size.
$34.79

The third one has NOTHING to do with mixture
Ok thanks. So warm pipes are better for changing out the sensors?

I will call Advance. Only shop that would have that tool in this town. Only other 2 shops are Carquest and Napa.

How is $34 each a better deal than I got? Isn't Bosch good? Only real other options were Delphi and the two Japanese brands which I won't use (Denso and NGK) because I don't use Asian parts on an American car. Plus throw in shipping and it gets expensive. I got free 2 day shipping with Amazon Student. RockAuto had the same Bosch sensors for about the same price, but I also had to order a fan for my computer and a belt for the truck so I did all of this in the same transaction and the 2 day shipping was free.

So I will leave the 3rd one alone unless it causes a problem. Thanks
__________________
2007 Chevy Trailblazer LT (22,000 Miles)
Mods: PCM of NC Transmission cooler, Interior LEDs

1998 GMC Jimmy 4x4 SLT (128,000 Miles)
Mods: Eurotails, Cold Air Intake, B&M transmission cooler, Throttle Body Spacer, Posi-Lok, interior LEDs
Reply With Quote
  #5  
Old 02-09-2012, 03:51 PM
ComputerNerdBD's Avatar
Senior Member
2007 Chevrolet TrailBlazer
My Garage
 
Join Date: Jan 2009
Location: Eastern Central New York State
Posts: 996
ComputerNerdBD is on a distinguished road
Default

Got them done earlier. Just the front 2. Did it in the college parking lot since my apartment's lot is just mud. Both were hard to free from the pipe. I borrowed the O2 sensor socket kit from Advance and that was the only way I got them out. Now time will tell if the mileage went up, but some results I am getting so far look promising.

EDIT: Should I use the scan tool and hit the erase code function even if there are no codes or disconnect the battery in case there is data stored in the computer for the old sensors that would be holding my MPGs back?
__________________
2007 Chevy Trailblazer LT (22,000 Miles)
Mods: PCM of NC Transmission cooler, Interior LEDs

1998 GMC Jimmy 4x4 SLT (128,000 Miles)
Mods: Eurotails, Cold Air Intake, B&M transmission cooler, Throttle Body Spacer, Posi-Lok, interior LEDs

Last edited by ComputerNerdBD; 02-09-2012 at 09:45 PM.
Reply With Quote
  #6  
Old 06-18-2012, 12:08 AM
Starting Member
 
Join Date: Oct 2011
Posts: 1
mdivad1234 is on a distinguished road
Default mpg

did you notice any improvement in mpg?
Reply With Quote
  #7  
Old 07-01-2012, 10:18 PM
ComputerNerdBD's Avatar
Senior Member
2007 Chevrolet TrailBlazer
My Garage
 
Join Date: Jan 2009
Location: Eastern Central New York State
Posts: 996
ComputerNerdBD is on a distinguished road
Default

Quote:
Originally Posted by mdivad1234 View Post
did you notice any improvement in mpg?
Depends on driving conditions, but best case I notice several MPGs higher depending on cargo weight.
__________________
2007 Chevy Trailblazer LT (22,000 Miles)
Mods: PCM of NC Transmission cooler, Interior LEDs

1998 GMC Jimmy 4x4 SLT (128,000 Miles)
Mods: Eurotails, Cold Air Intake, B&M transmission cooler, Throttle Body Spacer, Posi-Lok, interior LEDs
Reply With Quote
  #8  
Old 07-01-2012, 10:46 PM
abig84's Avatar
BF Veteran
 
Join Date: Aug 2009
Location: munster indiana
Posts: 2,942
abig84 will become famous soon enoughabig84 will become famous soon enough
Default

since its a emissions related issue, resetting the check engine light wont change anything if you have to take it to get tested. the vehicle has to go through its drive cycles and it will reset itself periodicly

you can pull the battery for the heck of it. i hate doing that cause sometimes we do that at work and then the vehicle had to relearn a bunch of stuff and runs like crap for 10 minutes.
Reply With Quote
Old 07-01-2012, 10:46 PM
 
 
 
Reply

Tags
02, 1998, 96, 98, blazer, chev, chevy, gmc, jimmy, o2, oxygen, replace, replacement, sencer, sensor


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is one brand of oxygen sensor better ronaldo 2nd Gen S-series (1995-2005) Tech 9 05-10-2010 08:17 AM
Oxygen Sensor litterbug 2nd Gen S-series (1995-2005) Tech 13 02-01-2010 10:33 AM
Oxygen Sensor PiTRiFF 2nd Gen S-series (1995-2005) Tech 10 06-16-2009 09:41 PM
Oxygen Sensor Spacer ebornand 2nd Gen S-series (1995-2005) Tech 1 05-24-2009 01:36 PM
Why only one oxygen sensor on '95? riverjamie Engine & Transmission 4 01-03-2008 05:15 PM

Advertising

Featured Sponsors
Vendor Directory
Our Sponsors

All times are GMT -5. The time now is 01:20 PM.

Internet Brands, Inc.