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03-06-2008
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MonsterMoose
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Join Date: Nov 2003
Location: Brisbane, Southside
Age: 52
Posts: 10,539 What Jeep do I drive?: WK2
Likes: 369
Liked 1,110 Times in 691 Posts
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Cleaning oxygen sensor
Hi guys what is the best method of cleaning your oxygen sensor and is there a way to test it. I have a workshop manual for a Nissan Skyline that I had years ago and it gave you the correct signal range that it should output so you caould test it, does anybody have this sort of info for the Xj?
Cheers, Junglejuice....
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JJ
Do it once, Do it right!
2014 WK2 Overland
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03-06-2008
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AJOR Bronze
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Join Date: Sep 2006
Location: adelaide hills
Age: 61
Posts: 1,891 What Jeep do I drive?: XJ
Likes: 11
Liked 38 Times in 20 Posts
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I just soaked mine it petrol for a couple of hours then cleaned it with a rag. The only test I did was make sure the error code didn't come back.
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03-06-2008
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CrawlerStar
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Join Date: Feb 2008
Location: East Freo, WA
Age: 35
Posts: 294 What Jeep do I drive?: XJ
Likes: 0
Liked 0 Times in 0 Posts
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I used a toothbrush and some (HEAPS) of WD-40, that seemed to work, each time i sprayed it more black/brown crap came out of it. I ended up just replacing them though, i had done 128,000 on them, including about 20k without a (working) cat (now replaced).
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04-06-2008
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LokRinger
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Join Date: Jul 2002
Location: Victoria
Posts: 6,872
Likes: 790
Liked 1,758 Times in 557 Posts
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I just replace them at 135,000, I think the manual asks for, as they get slower to react with age, regardless if they are clean or not, a new one will still out perform and clean old one.
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09-06-2008
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AJOR Gold
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Join Date: May 2006
Location: Ocean Reef, Western Australia
Age: 60
Posts: 3,843 What Jeep do I drive?: XJ
Likes: 2
Liked 31 Times in 21 Posts
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the only real way to test them is to watch them on a scope (in my case i use special software on my laptop connected to the pcm) and ensure they are achieving proper voltage variances (usually 0-1v with 0 being lean and 1 full rich) and also that the switching rate is lightning quick (very important) as this will usually descrease with age (as gojeep sez). a good pre cat o2 will switch very quickly and produce a tall/sharp sine wave signal from around .2 to .8 volts. the downstream o2 will switch much slower and hang around .4 - .6 volts (the sine wave will be much more relaxed and smoother). in a perfect world the two signals will be pretty much in sync. u must watch it on a scope as a volt meter will not be able to keep up. there are ways to test the heater circuit with an ohm meter but you must know which type of o2 u have as many units can be permanently damaged doing this test (dont ask me which ones u can test this way as its an inconclusive/pointless test anyways). ive also seen a difference between cleaned units and new units where the full range of signal is not achieved (let alone sluggish switching rates). cleaning might be enough to extinguish a check engine light for a time but that doesnt mean the o2 is working to its full capacity. lots of o2s which are starting to become sluggish will NOT set a check engine light. mostly the cel is a result of VERY SLOW switching rates or a dead unit. as for cleaning, dunno how you can actually get the bulb inside the protective shield thoroughly clean without touching it (as its physically impossible). spoze soaking can help but i doubt you will get it clean enuf to do its job. $75 for a new one from Inject A Carb (or less from the states) will net you bigger savings in fuel economy in the long run than cleaning. you will also gain a little hp in most cases with new stuff. for most xjs 120K is the usual lifespan athough ive seen them go much, much sooner (as little as 65K).
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09-06-2008
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LokRinger
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Join Date: Jul 2002
Location: Victoria
Posts: 6,872
Likes: 790
Liked 1,758 Times in 557 Posts
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Thanks for all the extra insight Rodger.
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09-06-2008
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MonsterMoose
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Join Date: Nov 2003
Location: Brisbane, Southside
Age: 52
Posts: 10,539 What Jeep do I drive?: WK2
Likes: 369
Liked 1,110 Times in 691 Posts
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I knew that someone would know this sort of info, I would have thought that the workshop manual would have this sort of info.
How much is a new o2 sensor for a 95 model roughly??????
__________________
JJ
Do it once, Do it right!
2014 WK2 Overland
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