Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK > Engine Performance/Intake/Exhaust

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #37  
Old 02-10-2012, 06:15 PM
Member
My Jeep: 2004 4.7L WJ
 
Join Date: Jan 2012
Location: San Diego
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 934
prsdrat is on a distinguished road
Re: Oxygen Sensors and Their Role in Engine Management--A Primer

Thanks jeepgcoman for the great writeup. Question-will the PCM be confused if NTK O2 sensors are
used instead of the listed MOPAR California O2 sensors? Is there really a difference or is it just smoke
and mirrors for more $$$ ? Or will it throw codes?
__________________

__________________
Reply With Quote
  #38  
Old 02-11-2012, 11:57 AM
Member
My Jeep: 2006 5.7L WK
 
Join Date: Dec 2009
Location: Home of the Mountain Blue Bird
Posts: 984
Thanks: 0
Thanked 18 Times in 16 Posts
Rep Power: 154858
jeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond repute
Re: Oxygen Sensors and Their Role in Engine Management--A Primer

The sensors Mopar uses (at least for the 5.7) are NTK. All I was doing is relating my experience with the Bosch upstream sensors. Sensors, other than NTK, may work fine on other engines. I've read a few have tried others, like Denso, with good results. I've also read that many Chrysler vehicles are touchy when it comes to the type sensors used. Kind of like the spark plug issue on the 5.7 too. IMO, it's best to stick with stock, or at least something that others have said works well.
__________________

__________________
05 LX/RT & 06 WK/GCO, modded similarly, MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tube headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils/.060 plug gaps. 20 in. SRT Reps.
Reply With Quote
  #39  
Old 02-15-2013, 05:23 PM
imhoffg's Avatar
Member
My Jeep: 2007 3.7L WK
 
Join Date: Feb 2013
Location: The Twin Cities
Posts: 54
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 582
imhoffg is on a distinguished road
Garage
Re: Oxygen Sensors and Their Role in Engine Management--A Primer

so if i'm reading this correctly, and I'm looking to improve fuel efficiency, i should only have to replace the 1.1 and 1.2 O2 sensors, potentially saving $100?

"The rear O2 sensors (1/2 and 2/2) are used solely to determine catalytic converter efficiency. If their indications mirror the front sensors, after the cats. have warmed up to at least 600 degrees F, the converter is not working properly and needs to be replaced. Since the converter’s job is to burn any unburned fuel, further reducing emissions, the rear sensors will normally show a richer (less oxygen) mixture, meaning that most of the air/fuel mixture has been burned off."

Because the rear ones just monitor the emissions and the work of the cat, and had no affect on fuel injection?
__________________
Reply With Quote
  #40  
Old 02-16-2013, 09:44 PM
Member
My Jeep: 2006 5.7L WK
 
Join Date: Dec 2009
Location: Home of the Mountain Blue Bird
Posts: 984
Thanks: 0
Thanked 18 Times in 16 Posts
Rep Power: 154858
jeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond repute
Re: Oxygen Sensors and Their Role in Engine Management--A Primer

That's true but, if yours are indeed lazy, biased or outright bad, the downstream sensors are probably in about the same condition as the fronts. For the additional $60 or so I'd change them too. This is especially true if you don't have any way to monitor the real time voltages of the various sensors and the cat. temps.

I just got back from an 800 mile trip and spent a little time monitoring my 02's. I may have a slight exhaust leak on the right side, as my 2/2 reading would periodically drop below .450 mV and then go back to normal operation after a short while. When it did this, the 1/2 sensor crosscounts would slow down, tending to spend more time on the rich side. I guess what I am saying is that if the rears are malfunctioning, but not mirroring the fronts, the PCM still takes action to correct the mixture....in my case (potential exhaust leak) add more fuel. As a side note, my fuel economy was down a little more than it should be for this time of year, and the type of driving I was doing.
__________________

__________________
05 LX/RT & 06 WK/GCO, modded similarly, MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tube headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils/.060 plug gaps. 20 in. SRT Reps.
Reply With Quote
Reply

Thread Tools
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cali Jeep Meet '11 JeepCoop SouthWest 409 02-15-2012 10:34 AM
oxygen sensor replacement mrjaydeeone Troubleshooting/Problems 9 04-21-2010 03:00 AM
Bosch oxygen Sensors adesisto Engine Performance/Intake/Exhaust 3 01-07-2010 04:00 PM
Help, lint in my primer in doing NOW!! TimmyB Visual Modifications 4 09-20-2009 03:33 PM
The iEMS3 integrated Engine Management System Tim@NCTSLLC Performance Modifications 5 08-12-2009 11:24 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:28 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community