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Guest Message by DevFuse
 

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how to tell if your O2 sensor is bad?


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6 replies to this topic

#1 Guest_jon61484_*

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Posted 26 July 2003 - 11:52 AM

A while back, my gas mileage dropped. It backfires before getting to normal operating temp, and I've checked everything I can think of outside of the sensor. (IE: fixed exhaust leaks, doublechecked things)

now, I unplugged it, and don't see *any* difference in driving.

so, does this mean it's bad? the guy at carquest said "well, it may be alright. you need to get it tested first!"

Do I dish out $27 for a new one today and replace it? or...?

#2 Guest_archemitis_*

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Posted 26 July 2003 - 12:00 PM

is this one of those ea81s with the wierd spark plug sensor... or is this mpfi or spfi? i have a bud who made exhaust for his spfi with no o2 sensor and it works great. the tps and maf sensor does most of the work. the o2 just does stuff when you are cruising, which could explain the mileage. the type of fuel delivery could help out the diagnosis

#3 Guest_jon61484_*

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Posted 26 July 2003 - 12:51 PM

EA81 carbed 2bbl hitachi. I just bought a new sensor ($24) and I'm going to be installing that shortly.

later

#4 Guest_Snowman_*

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Posted 26 July 2003 - 01:04 PM

Sorry to butt in, but could somebody explain to my how the heck a carbed engine would use an oxygen sensor?

#5 Guest_archemitis_*

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Posted 26 July 2003 - 01:27 PM

pre efi emissions. they call it a feedback carb system, i think. does very little

#6 Guest_86 subaru_*

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Posted 26 July 2003 - 03:30 PM

mine went bad , when it showed codes , 86 spfi 2wd a/t sedan and another sensor on the motor

#7 Guest_jon61484_*

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Posted 26 July 2003 - 08:37 PM

How I could tell immediately that it made a difference was that when starting up (when it's not at normal op temperature yet) it would backfire (like misfiring... but would get worse the colder the temp outside.) when the RPMS would go down (switching gears)

Now it doesn't do that. And it's noticeably smoother on the response and better movement of the tach.

The old one was soooo white, that the fins were completely covered up. Not a whole lot, but enough.




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