Go Back   DIY Chatroom Home Improvement Forum > Do It Yourself > Automotive Repairs

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-06-2009, 05:24 PM   #1
Old Timer
 
Join Date: Mar 2009
Location: Maine
Posts: 10
Share |
Default

O2 sensor Question


Hello . and thanks in advance, How can you tell if a O2 sensor is going bad?No Codes pop up... could a decrease in MPG be a sign? I am assuming that I may have a issue..I just picked up a 2000 Chevy/Suzuki 4x4 Tracker 2.0 motor 42000 miles on the clock.. I live rural.. No stop lights and very few stop signs,, We have 10% Ethanol in the Gas.. Use the 4 wheel feature a few times,, got 21 MPG.. Est 30 mpg hwy.. and I know est can be off LOL..Just changes the AF,, 20$ man that gave me a stroke .. Does this look average??? and can you use a universal O2 sensor with the same results? I see a BIG difference in $$$$.... Thanks Rich

Radco is offline   Reply With Quote
Old 03-17-2009, 11:05 PM   #2
HVAC / Plumbing
 
Join Date: Feb 2009
Posts: 1,801
Default

O2 sensor Question


It should give a code if the 02 sensor is bad

kenmac is offline   Reply With Quote
Old 03-18-2009, 05:17 AM   #3
Oldguy
 
Rehabber's Avatar
 
Join Date: Dec 2005
Location: Calif (the left coast)
Posts: 498
Default

O2 sensor Question


Many things can affect gas mileage. First check the thermostat and make sure it is opening at the correct temperature. (if it is opening at a lower temp, the computer thinks it needs to enrich the fuel mixture) Maybe a good tune up? New plugs, plug wires, fuel filter, pcv valve, etc. and don't forget to clean the throttle body and mass airflow sensor. O2 sensors rarely fail before 50,000 miles. (and I don't recommend universal fit sensors, use an exact fit.)
__________________
If you think you can, or if you think you can't, you're probably right.

ASE certified master auto tech, Retired.
Rehabber is offline   Reply With Quote
Old 03-18-2009, 02:20 PM   #4
Old Timer
 
Join Date: Mar 2009
Location: Maine
Posts: 10
Default

O2 sensor Question


Thanks for the help.. I did find a gasket leak at the flange connection on the exhaust.. I will do plugs this week, Change the gear oil (ALL) and motor oil to Synthetic,,, AF was dirty,, new one in,, almost had a stroke when I cashed in 20$ WOW they went up LOL...I also have a K&N Now for next change,,, Gas filter will be changed as well... Trasmission fluid will be soon..A older lady had it so I am assuming maint not on her to do list as pri 1.. Tire press was 40 PSI.. Road like a Buck Board LOL.. 30 PSI like a new truck,, I will change all hoses and Rad fluid B4 Winter.....and maybe the plug wires,, STill cannt find the Cabin AF yet,, I know where it is supposed to be,, BUT no luck yet LOL. Got another Radio player,, The stock had a Cassette deck,, found one on E Bay w/CD off a 03 30$ Shipped,,,With VIN # as well..Plus receipt, to show its legal if I need unlock codes, I didnt ,,.. ANY other tips? For a cheap SUV this thing is GREAT,,,,,,Thanks again,Rich
Radco is offline   Reply With Quote
Old 03-18-2009, 08:55 PM   #5
I have gas!
 
Clutchcargo's Avatar
 
Join Date: Mar 2007
Location: Massachusetts
Posts: 1,770
Default

O2 sensor Question


Your mileage sounds about right. You'll get better mileage when the weather warms up.
__________________
I tear things down and build them up.
Clutchcargo is offline   Reply With Quote
Old 03-18-2009, 11:14 PM   #6
HVAC / Plumbing
 
Join Date: Feb 2009
Posts: 1,801
Default

O2 sensor Question


Radco, I have a 2000 mazda. It had a clogged passage to the EGR. At the time of the clog, I was getting steady 32-33 MPG. I cleaned the throttle body ( the clog) Re-set the ECM. Now I only get 27-28 mpg..Go figure
kenmac is offline   Reply With Quote
Old 03-19-2009, 07:15 AM   #7
Old Timer
 
Join Date: Mar 2009
Location: Maine
Posts: 10
Default

O2 sensor Question


The Guy I got the Tracker from,,Private dealer, installed the Nex exhaust gasket, and did the breaks and rotars,, NO CHARGE! Seem alot smoother ... But between 1500/2000 RPM I get a light exhaust noise,, hit 2 k rpm quiet again,, I call him today,, to check it out,, But I did have him cleam the Throttle body as well.. The Tracker idless @ 750 rpm,,, and with EFI cannt adjust it higer...
Ken I hear you about fixing a problem abd getting less mpg lol.. Had that happen on my Intriped...
again everyone, thanks for your advice
Rich

Last edited by Radco; 03-19-2009 at 07:17 AM.
Radco is offline   Reply With Quote
Old 03-20-2009, 07:00 AM   #8
Member
 
Join Date: Dec 2008
Location: South Western Ontario
Posts: 955
Default

O2 sensor Question


Just had 1 of 3 sensors done on my Lexus RX300 @155,000 miles. it was wonkey and fuel system cleaner, etc didn't help. Mileage was dropping and we could smell gas. Low idle was rough, check engine and ETC lights were on. We reset the system after reading the meter and it came back on a few days later.
Tech told me it sends a signal back to the ECU to increase fuel ratio hence the poor mileage. We watched the meter when he installed the new sensor and the ECU decreased the fuel ratio before our eyes from over 50% to back around 6% as he predicted it should.
Chemist1961 is offline   Reply With Quote
Old 03-20-2009, 10:50 AM   #9
Old Timer
 
Join Date: Mar 2009
Location: Maine
Posts: 10
Default

O2 sensor Question


Sensor checks out OK... Exhaust leak fixed,, with new AF Im got 3MPG Better... Going to change the plugs.(43000 on them) and change the Front,Rear and Transfer case to Full Synthetic,,, and Full synthetic in the oil as well....I will also change the Gas filter..and cut it in 1/2 to see what 43k looks like wit our crappy gas ...Rich
Has anyone tries that New Hydrogen gas that Shell sells? notice anything good or bad???
Radco is offline   Reply With Quote
Old 03-21-2009, 02:12 AM   #10
I try to not screw up.
 
Join Date: Dec 2008
Location: Somewhere in Sac
Posts: 30
Default

O2 sensor Question


Quote:
Originally Posted by kenmac View Post
Radco, I have a 2000 mazda. It had a clogged passage to the EGR. At the time of the clog, I was getting steady 32-33 MPG. I cleaned the throttle body ( the clog) Re-set the ECM. Now I only get 27-28 mpg..Go figure
An EGR pumps inert gasses into the intake. It only does this at part throttle. One of the side effects is a lack of power. You don't notice it because of the driving conditions. When you loose power it takes more to go the same speed, resulting in poor mileage. The EGR is used ONLY to reduce oxides of nitrogen.
2long4u is offline   Reply With Quote
Old 03-21-2009, 08:04 AM   #11
Old Timer
 
Join Date: Mar 2009
Location: Maine
Posts: 10
Default

O2 sensor Question


Quote:
Originally Posted by 2long4u View Post
An EGR pumps inert gasses into the intake. It only does this at part throttle. One of the side effects is a lack of power. You don't notice it because of the driving conditions. When you loose power it takes more to go the same speed, resulting in poor mileage. The EGR is used ONLY to reduce oxides of nitrogen.
Thanks nice explaination

Radco is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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





Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.