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1979-2004 V6 Mustang Tech Discussions

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Unread 04-08-2013   #1 (permalink)
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Default How can I delete rear O2 sensors

Ok so I got a shop near me to make an X-pipe for my 98 V6 and they put the rear O2 sensors on the bottom/behind of the cats so I have a very big issue with them breaking from scraping the ground. I was wondering how I could delete the rear O2 sensors so that I can just take them out and just cap off the holes so i can run just my front O2. I'm growing tired of the CEL being on. Also the rear O2 just tell the PCM if the cats r working right? They don't effect gas mileage/performance do they?
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1998 3.8 auto:
Straight pipes w/ delta flow 40 series mufflers
K&N filter on cold air intake, Screamin demon coil w/ MSD wires
8.8" 98 gt rear 3.08 gears(using a SpeedCal from Dallas Mustang)
Flaming River 15:1 steering rack, Tokico HP series shocks & struts
MM c/c plates and lower control arms J&M upper control arms
2 Rockford Fosgate T1 12" subs w/ 1500 watt Power series amp
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Unread 04-08-2013   #2 (permalink)
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Mil eliminators

Sent from AutoGuide.com Free App
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Unread 04-08-2013   #3 (permalink)
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How do they work I thought you still needed to connect them to an O2?
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1998 3.8 auto:
Straight pipes w/ delta flow 40 series mufflers
K&N filter on cold air intake, Screamin demon coil w/ MSD wires
8.8" 98 gt rear 3.08 gears(using a SpeedCal from Dallas Mustang)
Flaming River 15:1 steering rack, Tokico HP series shocks & struts
MM c/c plates and lower control arms J&M upper control arms
2 Rockford Fosgate T1 12" subs w/ 1500 watt Power series amp
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Unread 04-08-2013   #4 (permalink)
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Can I connect the O2 sensor to the MIL eliminator to the O2 sensor wires but not attach them, or is there a loop I can do to not need O2 sensors n the rear at all?
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1998 3.8 auto:
Straight pipes w/ delta flow 40 series mufflers
K&N filter on cold air intake, Screamin demon coil w/ MSD wires
8.8" 98 gt rear 3.08 gears(using a SpeedCal from Dallas Mustang)
Flaming River 15:1 steering rack, Tokico HP series shocks & struts
MM c/c plates and lower control arms J&M upper control arms
2 Rockford Fosgate T1 12" subs w/ 1500 watt Power series amp
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Unread 04-08-2013   #5 (permalink)
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Front and rear O2 sensors give feedback to the ECM as to the Airfuel mix. The rear sensor tells if there's to much gas in the tailpipe that's not burned. I have got O2 eliminators and had no CEL stay on. Did you put the pipe in upside down O2's should maybe up and not down, just a Question.
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Unread 04-08-2013   #6 (permalink)
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Yeah its ok there correct. It only fits one way. I guess I just have to get te holes capped off and new holes put in. Not to mention it hangs low as hell.
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1998 3.8 auto:
Straight pipes w/ delta flow 40 series mufflers
K&N filter on cold air intake, Screamin demon coil w/ MSD wires
8.8" 98 gt rear 3.08 gears(using a SpeedCal from Dallas Mustang)
Flaming River 15:1 steering rack, Tokico HP series shocks & struts
MM c/c plates and lower control arms J&M upper control arms
2 Rockford Fosgate T1 12" subs w/ 1500 watt Power series amp
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Unread 04-08-2013   #7 (permalink)
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SCT SF3 #3015 tuner (pre-loaded) can turn them off. I got a good deal on mine - $310 shipped.
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Unread 04-08-2013   #8 (permalink)
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I talked to a guy at bama performance and he said I could turn them off but I may have some issues with how it ran. I guess I have to pay for some more exhaust work. I have to get new mufflers due to bad baffles so ill get him to fix it up for me 2 just gona cost lol
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1998 3.8 auto:
Straight pipes w/ delta flow 40 series mufflers
K&N filter on cold air intake, Screamin demon coil w/ MSD wires
8.8" 98 gt rear 3.08 gears(using a SpeedCal from Dallas Mustang)
Flaming River 15:1 steering rack, Tokico HP series shocks & struts
MM c/c plates and lower control arms J&M upper control arms
2 Rockford Fosgate T1 12" subs w/ 1500 watt Power series amp
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Unread 04-08-2013   #9 (permalink)
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I think I will just get it fixed right. I have to get new mufflers due to bad baffles so it won't add to much more to gettin that done. I talked to a guy at BAMA performance and he said that I could have issues in how it ran.
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1998 3.8 auto:
Straight pipes w/ delta flow 40 series mufflers
K&N filter on cold air intake, Screamin demon coil w/ MSD wires
8.8" 98 gt rear 3.08 gears(using a SpeedCal from Dallas Mustang)
Flaming River 15:1 steering rack, Tokico HP series shocks & struts
MM c/c plates and lower control arms J&M upper control arms
2 Rockford Fosgate T1 12" subs w/ 1500 watt Power series amp
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Unread 04-09-2013   #10 (permalink)
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turning off the rear O2s CANNOT cause it to run poorly i dont know why that guy would say that...
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Best 1/4 time: 15.036 @90.92mph, 2.148 60'
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Unread 04-09-2013   #11 (permalink)
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I was told it could cause lean conditions because that part of the analysis is gone
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1998 3.8 auto:
Straight pipes w/ delta flow 40 series mufflers
K&N filter on cold air intake, Screamin demon coil w/ MSD wires
8.8" 98 gt rear 3.08 gears(using a SpeedCal from Dallas Mustang)
Flaming River 15:1 steering rack, Tokico HP series shocks & struts
MM c/c plates and lower control arms J&M upper control arms
2 Rockford Fosgate T1 12" subs w/ 1500 watt Power series amp
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Unread 04-09-2013   #12 (permalink)
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nope, they're after the cats which alter the exhaust's composition anyway.. only the front two are used to control air fuel ratios. i say just have the exhaust shop re-clock the rear o2s, they shouldn't charge you for it as they did it kinda wrong the first time around.
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2003 3.8L V6 4R70W
Windstar Upper Intake with cool-air intake, MAC LT headers, BBK O/R H-pipe, and flow 40s, SCT tuner, FRPP Alum. D/S, 3.73 gears, Auburn HP limited slip, and Team Z LCAs, Eibach sway bars.
Best 1/4 time: 15.036 @90.92mph, 2.148 60'
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Unread 4 Weeks Ago   #13 (permalink)
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I had those elimators mentioned above, and they never worked, the CEL comes on and I have to use my computer to clear the codes before I get inspection stickers. I am going to turn it off via an SCT and sell the stupid eliminators
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Unread 4 Weeks Ago   #14 (permalink)
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Quote:
Originally Posted by Racestang View Post
I had those elimators mentioned above, and they never worked, the CEL comes on and I have to use my computer to clear the codes before I get inspection stickers. I am going to turn it off via an SCT and sell the stupid eliminators
The post doesn't mention the model year of YOUR car. The PCM in a 2004 is different from the PCM programming in a 1998.

I could easily see where a MIL kit won't work in a 2004 that would work in an older Mustang.

Why? Many MIL kits work by sending a random signal in an attempt to "fool" the PCM. The new PCM programming has a subroutine that runs from time to time. The subroutine deliberately causes a misfire and looks for the signature to be seen at the rear O2 sensor. The PCM code isn't fooled by the old style MIL kits.

As an option, consider looking at anti-foulers which may or may not work.

The sure fire way to solve the issue is with a modified tune.
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Unread 4 Weeks Ago   #15 (permalink)
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Repair shop screwed up, they have to reweld O2 sensor nuts and buy you new sensors. If pipes are too low they have to redo everything.
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