Catalytic Converter ?s - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Exhaust Mods

Exhaust Mods Performance Exhaust Modifications

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
  #1  
Old 03-19-2017, 10:59 AM
kinsy2323 kinsy2323 is offline
Junior Member
 
2006 Chevy TrailBlazer LT
Graystone Metallic 4.2L I6 4X4
Join Date: May 2015
Location: Thief River Falls, MN
Posts: 14
Catalytic Converter ?s

I have a 2006 Trailblazer. I am looking for step by step instructions to remove and replace the catalytic converter.
When I started it, there was a faint smell of rotten eggs. There is lagging upon acceleration...not all the time but it happens enough to need to fix it.
Check engine light is on. O2 sensor is only 3 months old. MPG is lower than it should be.
Answers, ideas or suggestions welcome.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 03-19-2017, 12:26 PM
AWD V8's Avatar
AWD V8 AWD V8 is offline
Senior Member
 
2003 GMC Envoy SLT
Indigo Blue Metallic 5.3L V8 AWD
Join Date: Dec 2014
Location: Surrey BC
Posts: 579
Well the first thing I would suggest is that you get the codes read.

Replacing expensive parts just because you feel it could be that is not something I could afford.

If the code is a P0420 , catalyst below efficiency, it could very well be a clogged cat, causing poor performance, or simply at cat that past it's prime. But that said, even if you DO have that code, it doesn't mean that that is your lack of power. That said, the cat could still be plugged and you get no P0420, but maybe a code for a MAF.

Lots of reasons for low power, need to start with the codes.

You also should have a scanner that can read real-time data so that we can help you narrow down where the problem is.

Android phone? You can get the Torque app & an OBD adapter for under 20 bucks that will do much more than you need.
__________________
I was planning on procrastinating today but I think I'll do that tomorrow.
Reply With Quote Quick reply to this message
  #3  
Old 03-19-2017, 06:59 PM
kinsy2323 kinsy2323 is offline
Junior Member
 
2006 Chevy TrailBlazer LT
Graystone Metallic 4.2L I6 4X4
Join Date: May 2015
Location: Thief River Falls, MN
Posts: 14
ok. I will do that and get back to you.
Thank you for replying!!!
Reply With Quote Quick reply to this message
 
  #4  
Old 03-19-2017, 09:55 PM
AWD V8's Avatar
AWD V8 AWD V8 is offline
Senior Member
 
2003 GMC Envoy SLT
Indigo Blue Metallic 5.3L V8 AWD
Join Date: Dec 2014
Location: Surrey BC
Posts: 579
I don't have a screenshot of the Torque app post-cat O2 sensor.

This is what the pre-cat B1S1 should look like in Torque

Bank1 Sensor1
[IMG][/IMG]

The post-cat O2 sensor on a scanner, or Torque app will be called B1S2, for Bank1 Sensor2. Sensor 2 is always a post-cat oxygen sensor.

Each scanner will graph the voltage readings a bit different, this is another app screenshot showing the post-cat graph on the top, and the pre-cat on the bottom. The post-cat readings will usually appear "stair stepped" or as a much slower oscillation.


You can buy the ELM327 OBD2 adapter on eBay for under $15, or Amazon
This is the one to buy. I've tried several and this one is the most versatile and reliable. Some others won't always work on all vehicles, and some won't stay connected.
__________________
I was planning on procrastinating today but I think I'll do that tomorrow.
Reply With Quote Quick reply to this message
  #5  
Old 03-25-2017, 03:11 PM
kinsy2323 kinsy2323 is offline
Junior Member
 
2006 Chevy TrailBlazer LT
Graystone Metallic 4.2L I6 4X4
Join Date: May 2015
Location: Thief River Falls, MN
Posts: 14
I received my Bluetooth OBD scanner today and ran the diagnostics. I got the TC P0135 which is the o2 sensor. I also hooked up the fuel pressure tester and got 55PSI so that looks good.
The problem with the vehicle is, when I start driving, after a little while a warning light comes on and then I am unable to accelerate. I will pull over and restart the engine and it will drive just fine. Can this 02 sensor cause that?
I didn't download the Torque app but the OBDlink app that was advised to use. I don't know how to save the report or send it to me but I do have some snapshots if you want to see those.
Attached Thumbnails
Click image for larger version

Name:	Screenshot_20170325-112015.jpg‎
Views:	9
Size:	35.9 KB
ID:	34401   Click image for larger version

Name:	Screenshot_20170325-112311.jpg‎
Views:	6
Size:	50.3 KB
ID:	34409   Click image for larger version

Name:	Screenshot_20170325-113157.jpg‎
Views:	9
Size:	33.6 KB
ID:	34417   Click image for larger version

Name:	Screenshot_20170325-112042.jpg‎
Views:	6
Size:	44.3 KB
ID:	34425  
Reply With Quote Quick reply to this message
  #6  
Old 03-25-2017, 07:45 PM
kinsy2323 kinsy2323 is offline
Junior Member
 
2006 Chevy TrailBlazer LT
Graystone Metallic 4.2L I6 4X4
Join Date: May 2015
Location: Thief River Falls, MN
Posts: 14
Quote:
Originally Posted by AWD V8 View Post
Well the first thing I would suggest is that you get the codes read.

Replacing expensive parts just because you feel it could be that is not something I could afford.

If the code is a P0420 , catalyst below efficiency, it could very well be a clogged cat, causing poor performance, or simply at cat that past it's prime. But that said, even if you DO have that code, it doesn't mean that that is your lack of power. That said, the cat could still be plugged and you get no P0420, but maybe a code for a MAF.

Lots of reasons for low power, need to start with the codes.

You also should have a scanner that can read real-time data so that we can help you narrow down where the problem is.

Android phone? You can get the Torque app & an OBD adapter for under 20 bucks that will do much more than you need.
I received the scanner and ran a diagnostics. The only code that came up was P0135 which is the oxygen sensor. When I figure out what the part number is I'll order that tonight. I'm not so sure that this bad sensor could be the problem I originally posted but I"m hoping so.
Reply With Quote Quick reply to this message
  #7  
Old 03-26-2017, 02:19 AM
AWD V8's Avatar
AWD V8 AWD V8 is offline
Senior Member
 
2003 GMC Envoy SLT
Indigo Blue Metallic 5.3L V8 AWD
Join Date: Dec 2014
Location: Surrey BC
Posts: 579
The P0135 is for the heater for the sensor. "Most" times it is a failed sensor, but it can also be a bad ground for the sensor, or a corroded connector.
It's not a bad idea to replace the sensor first as in most cases these sensors never get replaced as often as they should. A new sensor response quicker than a high mileage sensor and can improve fuel mileage and lower emissions.
__________________
I was planning on procrastinating today but I think I'll do that tomorrow.
Reply With Quote Quick reply to this message
  #8  
Old 03-26-2017, 11:43 AM
kinsy2323 kinsy2323 is offline
Junior Member
 
2006 Chevy TrailBlazer LT
Graystone Metallic 4.2L I6 4X4
Join Date: May 2015
Location: Thief River Falls, MN
Posts: 14
It was Bank 1 Sensor 1.
The local auto store asked if it was an upstream or downstream.
I didn't know so I didn't buy the one he tried t o sell me for $106.
2006 Tailblazer LT 4.2L
Would you help me out with a part number for AC Delco or Denso?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Tags
catalytic, converter, trailblazer 2006

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live (ex: Philadephia, PA)
Vehicle Year
Choose your year
Or enter your choice here:
Vehicle Color
Choose your factory color (Custom, Not Listed & Two-Tones; Use Text Field Below)
Or enter your choice here:
Vehicle Make
Choose your make
Or enter your choice here:
Vehicle Model
Choose your model
Or enter your choice here:
Vehicle Engine
Choose your engine
Vehicle Drivetrain
Choose your vehicle drivetrain
Security Question
Fill in the blanks: Tra___oy
Insurance
Please select your insurance company (Optional)

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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

Forum Jump


» Sponsors

Advertising Info

All times are GMT -4. The time now is 01:05 PM.


Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed