o2 sensors - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-06-2008, 11:12 PM   #1
Jeeper
 
tobycat1's Avatar
 
Join Date: Aug 2007
Location: Sac town
Posts: 978
o2 sensors

How can I check if they are bad?

__________________
myspace.com/bigtanner
tobycat1 is offline   Quote
Old 05-06-2008, 11:45 PM   #2
Jeeper
 
dwdrums801's Avatar
 
Join Date: Aug 2006
Location: Long Island, NY
Posts: 1,298
they will usually throw a code im pretty sure

__________________
06 Rubi Unlimited, 3.5" Rubicon Express LA, OME Shocks, Metal Cloak Aluminum Bumper, Warn Winch, Power locks/remote start.
dwdrums801 is offline   Quote
Old 05-07-2008, 12:18 AM   #3
Jeeper
 
Join Date: Mar 2008
Posts: 97
http://mr2.com/TEXT/O2_Sensor.html good write up. The test process is at the bottom of the page.

Typically they'll throw a code. Keep in mind the the downstream one doesn't affect engine management.

If you've lost a decent chunk of gas mileage and don't have a trouble light on, don't bother with the O2 sensors. Its better to start checking other things.
__________________
HEY CHRYSLER!

Rotting piece of junk with some bling in the rear axle.
sailsurf7713 is offline   Quote
Old 05-07-2008, 01:01 AM   #4
Jeeper
 
tobycat1's Avatar
 
Join Date: Aug 2007
Location: Sac town
Posts: 978
Like what?
__________________
myspace.com/bigtanner
tobycat1 is offline   Quote
Old 05-07-2008, 01:06 AM   #5
Jeeper
 
tobycat1's Avatar
 
Join Date: Aug 2007
Location: Sac town
Posts: 978
Ok, vac line question. I don't know jack sh*t about vac lines, but a few thousand miles back I was told by the dealership(free estimate) that vacline was in bad shape. they said they tempoarily fixed it, but that it must be replaced. I never replaced it, where can I get all new lines? How do I install them? Could this help mileage?

And, would a bad serpentine belt cause any loss in milage? Cause mine has lots of cracks, I bought a new one, but have been too lazy to install it.
__________________
myspace.com/bigtanner
tobycat1 is offline   Quote
Old 05-07-2008, 10:18 AM   #6
Jeeper
 
Join Date: Mar 2008
Posts: 97
A broken vacuum line can cause a significant change in gas mileage. Did they say which one? I don't know much about them and I am still adapting myself to the 2.5 L from my 3.9 Liter Magnum V6.

My recommendation to you would be to pick up a haynes repair manual (typically 17-18 bucks on amazon or 20-30 at a bookstore) and read up on checking the vacuum line pressure. Once you've determined a problem, go searching.

Please don't be lazy about the serpentine belt if its in bad shape. Its not gonna cause bad gas mileage, but if it breaks you lose alternator, clutch fan, water pump, power steering, A/C....Its not worth the potential headache and tow to delay throwing it on or having a shop do it in 15 minutes.

Doesn't hurt to check the little things, like distributor cap, plugs, wires, air filter, throttle body, etc. Knock on the cat and see if its rattling or if it glows red hot at night after driving, or if there's a sulfur smell from the tailpipe. They're sorta crap from factory, I would recommend magnaflow. They flow well and they are more durable than I would have ever imagined.

Sweet 4 banger by the way. I've got a 99 SE also. How's the git up and go with the 33s?
__________________
HEY CHRYSLER!

Rotting piece of junk with some bling in the rear axle.
sailsurf7713 is offline   Quote
Old 05-07-2008, 02:31 PM   #7
Jeeper
 
4.0l sahara's Avatar
 
Join Date: Apr 2007
Location: shelton,ct
Posts: 2,228
Het some carb cleaner and spray the vac lines it will rev a little if there is a leak.
__________________
99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
4.0l sahara is offline   Quote
Old 05-07-2008, 05:08 PM   #8
Jeeper
 
tobycat1's Avatar
 
Join Date: Aug 2007
Location: Sac town
Posts: 978
Quote:
Originally Posted by sailsurf7713 View Post
A broken vacuum line can cause a significant change in gas mileage. Did they say which one? I don't know much about them and I am still adapting myself to the 2.5 L from my 3.9 Liter Magnum V6.

My recommendation to you would be to pick up a haynes repair manual (typically 17-18 bucks on amazon or 20-30 at a bookstore) and read up on checking the vacuum line pressure. Once you've determined a problem, go searching.

Please don't be lazy about the serpentine belt if its in bad shape. Its not gonna cause bad gas mileage, but if it breaks you lose alternator, clutch fan, water pump, power steering, A/C....Its not worth the potential headache and tow to delay throwing it on or having a shop do it in 15 minutes.

Doesn't hurt to check the little things, like distributor cap, plugs, wires, air filter, throttle body, etc. Knock on the cat and see if its rattling or if it glows red hot at night after driving, or if there's a sulfur smell from the tailpipe. They're sorta crap from factory, I would recommend magnaflow. They flow well and they are more durable than I would have ever imagined.

Sweet 4 banger by the way. I've got a 99 SE also. How's the git up and go with the 33s?
It does ok, but i need to re-gear because its an auto. The plugs, dist cap, wires are all new, and I have a CAI. The 33" tires and steel rims really hurt fuel econ. I'll knock on the cat when it cools down, and I will probably change the belt this weekend.
__________________
myspace.com/bigtanner
tobycat1 is offline   Quote
Old 05-07-2008, 05:09 PM   #9
Jeeper
 
tobycat1's Avatar
 
Join Date: Aug 2007
Location: Sac town
Posts: 978
Quote:
Originally Posted by 4.0l sahara View Post
Het some carb cleaner and spray the vac lines it will rev a little if there is a leak.
I would like to try that, where are the vac lines again?

__________________
myspace.com/bigtanner
tobycat1 is offline   Quote
Reply

Thread Tools

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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
o2 sensors? tobycat1 TJ Tech Forum 1 04-20-2008 02:26 PM
Oxygen Sensors Gerald TJ Tech Forum 15 03-27-2008 08:30 PM
Resetting maintenance indicator light after changing O2 sensors? ironmonk TJ Tech Forum 7 10-16-2007 07:52 PM
sensors in engine bay jeepkid189 TJ Tech Forum 5 08-20-2007 06:54 PM
o2 sensors JCS05Rubi General Jeep Discussion 3 04-19-2007 08:38 PM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 08:05 PM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC