How bad is it to run with only 1 O2 sensor??

N8Miller · May 24, 2004

Ok, i have to reroute the wiring for the sensor. I have been running around (about 60-70 miles tops) with only 1 in becasue when i switched to longtubes, only one was long enough. i am going to find a way to wire the other one in tommrow, but i was wondering if i did any damage or not? the motor runs strong---but i can tell it needs the other O2.
thanks

HISSIN50 · May 24, 2004

i think it goes into a default mode if there is one or more missing o2 sensor(s). it should be fine (no worse than having a wire get chafed/cut).

N8Miller · May 25, 2004

bump....

astronut1885 · May 25, 2004

You're running in closed loop right now, so it's running pretty inefficient and rich. Worse thing about it is the exhaust leak where the sensor is supposed to screw in. Other than that, your car should be fine.

TheUser · May 25, 2004

they make o2 extentions for this purpose. http://store.summitracing.com/default.asp?target=search.asp&type=bykeyword&searchtype=both&part=mustang+o2+extention

shorty1993 · May 25, 2004

we put long tubes on a friends 89 lx, he forgot to order the extensions, so i bought some wire $4, connectors $2 clipped and extended his. never had a problem. even on the dyno, air/fuel was correct. those extensions are pretty high. good luck

N8Miller · May 25, 2004

Yeah, i would normally just splice it myself or get the extenders, but guys like Rick91GT says that it leads to inaccurate readings.....

jetuomi · May 25, 2004

you're actually running in open loop right now and based on rpm and load % it is using the open_loop_stabalized_fuel table (that's not quite the exact name).. so if your A/F is accurately tuned with your AFPR, then, when the EEC commands 13.95:1 for example under 60% load @ 4000 rpm then it should be okay.. the exhaust leak part is what I'd be more worried about long-term... but that's why you feel more powerful since you're running a more rich A/F compared to the Closed Loop (re: both o2's working) target of 14.654:1...

Qwk88LX · May 25, 2004

I've done it, just replaced my busted one..it'll run rich & your gas mileage will suck

siege · May 27, 2004

well reading this makes me wonder if one of my O2's is bad. I replaced 1 about a year and a half ago cause it was stripped out (was swapping h-pipes) and for the past 8 months or so I've been getting lower gas mileage than I think I should and it smells rich. is there any way to check if the old one has gone bad? or is it basically just one of those "buy and try" things?

IMPORTSMOKER · May 27, 2004

I just found out that the reason my check engine light was on for about 3 months is because one of my o2's wasn't connected...I pulled both out and burned the ends off with a propane torch (coleman bar-b-q) made sure they were hooked in this time and DAMN! the car seems to run stronger and the gas milage is waaaay better now..and the best thing is that I dont have to look at that damn check engine light anynmore...

Matts89LX5.0 · May 27, 2004

i disconnected both mine in my old stang and never had any problems. I heard your spark plugs go bad quicker with no O2 sensors. Anyway, good luck Nate.

Matt

Ourobos · May 27, 2004

I put longtubes on my fox 2 days ago. Didn't realize the sensors were too far away. I just cut my plug-ins, ran 1 foot of wire from the sensor to the plug-ins, taped them up well, and put some wire wrap on them. No engine lights, runs sweet.. Longs tubes and Dr. Gas are made for each other.

siege · May 28, 2004

IMPORTSMOKER said:
I just found out that the reason my check engine light was on for about 3 months is because one of my o2's wasn't connected...I pulled both out and burned the ends off with a propane torch (coleman bar-b-q) made sure they were hooked in this time and DAMN! the car seems to run stronger and the gas milage is waaaay better now..and the best thing is that I dont have to look at that damn check engine light anynmore...

what purpose does burning them have? just to get all the old carbon and junk off? maybe I should try that...

and what kind of gas mileage were you getting with one unhooked? I get like 14mpg but I'm sure it should be more as I only have light mods - and it just reeks of gas when its running

_jb_ · Jun 2, 2004

I found out the other day that I only have one 02 sensor hooked up. I get good gas milage though, and the car seems to drive fine. No check engine light or anything coming on. I bought a new sensor but I have to drill a hole for it in my exhaust and everything. I'm not sure if it's worth it or not.

rpark · Jun 3, 2004

Are the O2 sensors necessary?

I'm swapping a 5.0 into another vehicle without any of the smog stuff or a cat. Does the 5.0 computer need an O2 sensor to function properly or does the lack of O2 sensors put it into Limp mode?

Thanks,

Bob

N8Miller · Jun 3, 2004

Bob,
if your swapping it and keeping the fuel injection, yes, i think you will need an o2 sensor.

Update:i spliced the wires and made them longer. it must have worked good becasuse it runs hard now and the idel has gotten better...so has the acceleration.

Qwk88LX · Jun 3, 2004

I replaced my busted O2 sensor, I think I'm getting better mileage..kinda hard to tell since I've got my C4 in now & I dont have OD...it does idle a lot better now though

_jb_ · Jun 3, 2004

Qwk88LX said:
I replaced my busted O2 sensor, I think I'm getting better mileage..kinda hard to tell since I've got my C4 in now & I dont have OD...it does idle a lot better now though

My car will die in cold temperatures when I start it. Maybe it's because of the one O2 sensor...or maybe its the cold. My truck will run like crap in the winter, while in the summer I hardly have to even turn the key to start it.

HISSIN50 · Jun 3, 2004

_JB_ said:
My car will die in cold temperatures when I start it. Maybe it's because of the one O2 sensor...or maybe its the cold. My truck will run like crap in the winter, while in the summer I hardly have to even turn the key to start it.

when the car is cold, the lambdas are not used. they begin to be used around 178*, IIRC.

your problem sounds more like an out of calibration ECT or ACT sensor. if it is telling the puter your motor is warm, when the motor is indeed cold, the mixture will be too lean. the sensors can be within spec (no code), but not proper for the situation (as above - telling the motor you are warm when you are cold).
you can check the values of the sensors with a DMM. good luck.

How bad is it to run with only 1 O2 sensor??

N8Miller

I need NOS....make it 2 of the big ones

HISSIN50

"How long does it take to get help in here?

N8Miller

I need NOS....make it 2 of the big ones

astronut1885

TheUser

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shorty1993

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N8Miller

I need NOS....make it 2 of the big ones

jetuomi

Qwk88LX

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siege

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IMPORTSMOKER

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Matts89LX5.0

Ourobos

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siege

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_jb_

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rpark

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N8Miller

I need NOS....make it 2 of the big ones

Qwk88LX

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_jb_

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HISSIN50

"How long does it take to get help in here?

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