salem
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wiring for oxygen sensor
hi all,
when i got a new oxygen sensor the plug was different to what I had. so i popped the pins and put them in the old plug, very very carefully.
however, my mechanic thinks i may have buggered something up as the signal is all wonky. it seemed to drive ok when i first replaced it, but now 3 years later i've been having ongoing issues with a slightly stuttery engine (when it's warmed up and under low throttle) with occasional surging. done all the usual suspects already (complete replacement of plugs, leads, dizzy cap, rotor. plus cleaned injectors blah blah blah). so it's probably the sensor, especially because of the wonky signal.
so, it's a 4 wire sensor off a '94 3s-gte. anyone have wiring diagram for it?
and if it's not the wiring, but the sensor itself is stuffed, anyone know a part number and/or best place to get a new one?
cheers.
Black 1994 SW20 turbo coupe - with GT4 3S-GTE engine swap
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Mrskylighter
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Re:wiring for oxygen sensor
2012/06/07 09:15:45
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try unlugging the sensor and see how the car drives. My Gen3 is experiencing the exact same surging, hesitation problems. With the sensor unplugged the car drives perfect just a little rich. I've done all the ig components as well so I'm going to try a new sensor and see how I go. I've ordered a new genuine gen3 oxygen sensor from Amayama in Japan for $160 plus shipping. Part number is 89465-29805 http://www.amayama.com/
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nissky
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Re:wiring for oxygen sensor
2012/06/07 09:39:05
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Oxygen sensor wiring 
post edited by nissky - 2012/06/07 09:55:15
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salem
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Re:wiring for oxygen sensor
2012/06/07 11:58:00
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Thanks guys. Sent the diagram to the mechanic.
I also unplugged the sensor for the drive to work this morning. Does indeed seem to run ok with it unplugged (although the cold start this morning seemed a little rougher than normal, it settled down quicker than normal as well. It's always had cold start problems though).
Black 1994 SW20 turbo coupe - with GT4 3S-GTE engine swap
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Mrskylighter
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Re:wiring for oxygen sensor
2012/06/09 15:03:14
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Have you made any progress with this issue?
I'm still waiting for my new sensor to arrive from Japan.
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salem
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Re:wiring for oxygen sensor
2012/06/09 16:09:34
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Car still hasn't gone back to mechanic yet. Did a few longer drives today with sensor unplugged. Was still a little missy occasionally. Mine is mostly when the boost gauge is showing major negative pressure, so I'm also thinking vacuum hose issue. But then also the coolant temperature sensor is iffy (crack in the plastic). I'm happy to throw money at this to fix it, I just don't know where!
Black 1994 SW20 turbo coupe - with GT4 3S-GTE engine swap
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zmit
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Re:wiring for oxygen sensor
2012/06/28 10:50:12
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The coolant sensor is surprisingly finnicky...
I'm running a 93+ ECU in my 92 and i've had problems with my 4-wire sensor. Have you checked the codes at all?
Mine has the O2 sensor code (which i think is 21, i havent checked in a while). That may give you another hint as to the problem too.
the ECU coolant sensor is code 50-something.
Also, just because the ECU light isn't permanently lit on the dash doesn't mean there aren't any codes stored.
1992 SW20 GT ... and loving it...
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salem
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Re:wiring for oxygen sensor
2012/06/28 11:29:05
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Well I drove for a bit with the o2 sensor unplugged. Was still having misses and surges. Plugged it back in, took it back to the mechanic, and now apparently it's signal is fine! But I have an exhaust leak. So now I need to find an exhaust place. And also get new springs and struts because they're loose and wobbly at the front.
Black 1994 SW20 turbo coupe - with GT4 3S-GTE engine swap
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Road and Track
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Re:wiring for oxygen sensor
2012/07/05 07:51:18
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Oxy sensors are rarely responsible for any low speed/low rev "issues". ECU corrections based on this sensor only apply at medium to high load
there are 2 temp sensors. the one going to the ECU (2 wire) is resposnible for many issues, particularly running rich. basically, as soon as it goes off, the engine starts running rich as the ECU interprests it as a cold engine. this wont throw a code until the sensor fails totally. The BGB tells you how to test the sensor, but its hardly worth the effort as they are cheap
we have new Oxy sensors in stock, depending on model, $95-$135
Road & Track For more information and contact details for Road & Track, clickHERE
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salem
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Re:wiring for oxygen sensor
2012/07/05 08:07:53
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Do you have temp sensors? And how much are they? I've always been a bit dubious about my current one's reliability.
Black 1994 SW20 turbo coupe - with GT4 3S-GTE engine swap
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