what are the pros/cons on having o2 sensors?
10-06-2009, 11:55 AM
#1
what are the pros/cons on having o2 sensors? cuttin up my harness and debating if i should keep them. i have the o2 sensors and there on my harness but if i dont need them so i can cut them out. please post pros and cons. if it will help with gas milage or idle ill keep them if not there gone. lmk
10-06-2009, 01:10 PM
#4
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front o2 sensors are used to establish a perfect 14.7:1 air fuel ratio under part throttle conditions and idle.
Otherwise, your computer will either go into limp mode, or fail safe mode and you'll be running around at 10:1 air fuel ratio and getting CRAP for gas mileage.
you CAN run without them, but you need to switch over to Speed Density only and ditch the MAF. WHICH IS A PAIN IN THE BUTT TO TUNE. Well, not a pain, but takes much longer, tuner needs the car for a few days to drive in all conditions.
Otherwise, your computer will either go into limp mode, or fail safe mode and you'll be running around at 10:1 air fuel ratio and getting CRAP for gas mileage.
you CAN run without them, but you need to switch over to Speed Density only and ditch the MAF. WHICH IS A PAIN IN THE BUTT TO TUNE. Well, not a pain, but takes much longer, tuner needs the car for a few days to drive in all conditions.
10-06-2009, 01:53 PM
#6
You don't need to run O2 sensors at all if you don't want to. We don't have them in our harness's and they run great on the street.
If you are running cats, you have to have them.
So, pros, they keep the engine at stoich and can learn different fuels
Cons - They keep the cost of installation up, you can't run leaner than 14.7:1 if you would want to. 2 more sensors to go bad and mess up. With a big enough cam, your idle will be way to rich with them operating. If you are using headers, they will adjust for leaks, which always sucks.
I guess unless you are running cats, take them out and put a wideband in if you are worried about being rich or lean. The MAF sensor will take care of most, 99.9% of the air changes that the car will see.
If you are running cats, you have to have them.
So, pros, they keep the engine at stoich and can learn different fuels
Cons - They keep the cost of installation up, you can't run leaner than 14.7:1 if you would want to. 2 more sensors to go bad and mess up. With a big enough cam, your idle will be way to rich with them operating. If you are using headers, they will adjust for leaks, which always sucks.
I guess unless you are running cats, take them out and put a wideband in if you are worried about being rich or lean. The MAF sensor will take care of most, 99.9% of the air changes that the car will see.
10-06-2009, 02:52 PM
#7
FYI, you can run OLSD (open loop speed density) on a 99+ PCM, which is speed density (no MAF) + O2 sensor fuel trims. You can do it on a 98 PCM also, but it's a PITA (to the best of my knowledge anyway).
Personally, I like having O2 sensors even though I don't use them for anything but a sanity check for my wideband O2. You need a ***** on speed density tune if you don't run them though, and keep in mind, elevation and temperature changes irk SD tunes.
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10-06-2009, 02:57 PM
#8
No, you need one in both banks or don't bother.
FYI, you can run OLSD (open loop speed density) on a 99+ PCM, which is speed density (no MAF) + O2 sensor fuel trims. You can do it on a 98 PCM also, but it's a PITA (to the best of my knowledge anyway).
Personally, I like having O2 sensors even though I don't use them for anything but a sanity check for my wideband O2. You need a ***** on speed density tune if you don't run them though, and keep in mind, elevation and temperature changes irk SD tunes.
FYI, you can run OLSD (open loop speed density) on a 99+ PCM, which is speed density (no MAF) + O2 sensor fuel trims. You can do it on a 98 PCM also, but it's a PITA (to the best of my knowledge anyway).
Personally, I like having O2 sensors even though I don't use them for anything but a sanity check for my wideband O2. You need a ***** on speed density tune if you don't run them though, and keep in mind, elevation and temperature changes irk SD tunes.
10-07-2009, 03:58 PM
#11
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I'm in California so I don't have to smog my car because it is made before 1974.
I know that the rear sensors are for the cats, but i was asking how removing the rear O2 sensors will affect the operation of the engine? does it run richer?
I know that the rear sensors are for the cats, but i was asking how removing the rear O2 sensors will affect the operation of the engine? does it run richer?
