how would i go about disabling the rear O2 sensors on my truck?
wish i could come out to the track on the 2nd so you could see if you could tweek the tune any more.
but hey, gonna try and go to the track this weekend and see if i have picked up some time. sure feels like it.
2010 Camaro 2SS/RS
2020 GMC Sierra AT4
I used 02 simm.
1999 Silverado 1500 Ext. cab Red 2/4 hotchkis drop & swaybars, bilstein stocks, AR626 & 404 Nitto's, Yank converter, ASM headers, ASP underdrive pulley, Taylor wires , free mods VCN 2000, Nelson Performance tuning
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Why you taking off the O2 sensers? What are the benifits of that?
99 Pewter SCSB
DJM 4/6 drop, Hotchkis front/reat swaybars,Hypertech power programer, milled & built heads, Accel wires, distributer,coil, Mass Air Flow Sensor(mti motor sports, Granatelli),Dynomax UltraFlow Stainless, 17x8.5 Eagle Alloys, Escalade door handles, Suburban front grille, with clear corners and billet bowtie,Street Scene mirrors, Cowl Hood
There are 4 O2 sensors. Two in front of the cats are for fuel metering and two after the cats to measure the effectiveness of the cats. If you remove the cats (or just don't care to have them) you can delete the rear O2 sensors. The PCM will throw a code if you remove them. You can use LS1 Edit to delete them or use a little plug in simulator to make the PCM think they are still there. The benifits are the PCM calculates(doesn't actually measure) cat temperture and when it thinks the cats are getting too hot it adds fuel to cool them(called cat overtemp COT). This makes the engine run slightly rich and can hender performance. I would edit this out if you don't have cats, if you do I would keep the rear O2s.Originally posted by pewter99@Dec 18 2003, 09:46 AM
Why you taking off the O2 sensers? What are the benifits of that?
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
just wanting to know. i was talking to lance last night and he said his are off, and he's still runnin cats. (you know what ever Lance does i have to do it too.)
i will be getting mine takin off around may after i have gotten the truck inspected.
just curious as to how to do it with edit. since i cant make it to the Jan 2 meet.
2010 Camaro 2SS/RS
2020 GMC Sierra AT4
Go in to edit, duh, lol.
Engine Diagnostic, Hardware Diagnostic, then
Find all the bank 1 and 2 tests that have Sensor 2 in them and toggle them off.
Does error set SES = off
Error Mode = off
this should do it,
too bad on the 2nd, it'll be a blast, i'll take the video and get some good footage, maybe have a passenger to tape it all.
allen
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see there you go right from the man himself.
04 supercrew 5.4 3 valve-magnaflow catback
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gotta catch me though
04 supercrew 5.4 3 valve-magnaflow catback
formerly 02denali 12.79@107
I have mine turned off too, I don't feel like getting bent for $90/ea when they go bad. Also my EGR is off.
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You say that with the rear 02 sensors on, the PCM will add fuel to cool the cats if they get too hot, and making you run rich.Originally posted by GMCwantsLS1@Dec 18 2003, 10:02 AM
You can use LS1 Edit to delete them or use a little plug in simulator to make the PCM think they are still there. The benifits are the PCM calculates(doesn't actually measure) cat temperture and when it thinks the cats are getting too hot it adds fuel to cool them(called cat overtemp COT). This makes the engine run slightly rich and can hender performance. I would edit this out if you don't have cats, if you do I would keep the rear O2s.
If you turn the rear 02 sensors off and you still have the cats, that would ruin the cats because you don't have the rear 02 sensors to tell the PCM to cool them off by adding fuel, right?
I live in Cali, and while I want to get the most out of my truck by tuning it, I also have to pass smog. If I turned the rear 02s off, and then back on when I go get a smog would I be fine? Or would the cats be fucked and would that make me not pass?
I guess what I really want to know is if turning off the rear 02s is worth a decent gain in power or not?
'01 Sierra 4.8 SCSB
4.10, Eaton posi, Nelson tune, 160 t-stat, K&N Intake, Magnaflow catback, Vig 3200, Transgo+billets, 100 NX wet shot
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