Bad 02 sensor?

[desertspyder]

How can you tell if you have a bad 02 sensor? I've been watching my logger like a hawk and my o2 readings never seem to go past 0.01. Usually stays at 0.00. If it is bad I know where I can get one for free but it's from a 97 n/t. Will it still work for my car?

 

[FastGS-T]

when watching your logger at idle, the o2 sensor should cycle. is it cycling?

 

[desertspyder]

When looking under test mode it goes up and down from 0 to like 30 something but so does the rev but my car isn't reving. During didital mode it doesn't hardly do krap. Maybe I'm using my logger wrong or something.

 

[blackGSX2g]

What is test mode? Your logger should display only raw o2 voltage. It should range between 0.00 and 1.xx. If it does not cycle as it should, then either your sensor is dead or your fuel trims are too far out of whack. Chances are your sensor is dead if you are getting poor gas mileage, blowing out black smoke, and low numbers from the sensor.

My original o2 sensor worked just fine on low throttle, but as soon as I got on it the voltage would drop to 0. Got a new sensor and it's ran great ever since.

 

[desertspyder]

So will an o2 sensor from a 97 non turbo work on my 96 gst? iIf so I'll install that sucker tomorrow and see what happens.

 

[a73_4g67]

What is test mode? Your logger should display only raw o2 voltage. It should range between 0.00 and 1.xx. If it does not cycle as it should, then either your sensor is dead or your fuel trims are too far out of whack. Chances are your sensor is dead if you are getting poor gas mileage, blowing out black smoke, and low numbers from the sensor.

My original o2 sensor worked just fine on low throttle, but as soon as I got on it the voltage would drop to 0. Got a new sensor and it's ran great ever since.

I'm having thoughts on my o2 sensor. Here's a log. Even if we try to rich it +4 on the SAFC, it doesnt change voltage, but my airflow reading changes as we try to rich it. Got bad knock also.

1G vr4 63T,550cc,2G MAF,walbro 255,afpr @ 40psi

2nd-3rd gear pull @ 15psi, 14B turbo, SAFC settings set to zero:

TIMA O2-R TPS RPM KNCK INJP
21° 0.43V 25.5% 875 0 5.12ms
18° 0.37V 23.1% 1375 0 4.35ms
26° 0.39V 14.5% 1594 0 2.56ms
27° 0.45V 11.8% 1031 0 2.05ms
10° 0.45V 18.8% 1313 0 3.07ms
27° 0.37V 24.3% 1406 0 4.61ms
26° 0.29V 24.3% 1750 0 3.84ms
30° 0.27V 24.3% 2094 0 3.58ms
32° 0.27V 24.7% 2375 0 3.33ms
32° 0.33V 25.1% 2656 0 3.33ms
34° 0.35V 26.3% 2906 0 3.33ms
36° 0.33V 26.7% 3125 0 3.33ms
38° 0.49V 10.2% 2906 0 1.02ms
45° 0.35V 18.4% 2188 0 2.82ms
35° 0.37V 33.7% 2063 0 4.86ms
24° 0.25V 34.1% 2219 0 4.86ms
27° 0.21V 34.1% 2406 0 4.86ms
29° 0.20V 34.1% 2656 0 5.12ms
30° 0.20V 34.1% 2813 0 5.63ms
31° 0.39V 34.9% 3063 0 6.14ms
30° 0.53V 36.1% 3344 0 6.40ms
30° 0.55V 43.5% 3688 0 7.94ms
27° 0.55V 45.5% 3906 0 9.47ms
27° 0.51V 57.3% 4281 27 14.08ms
14° 0.57V 58.0% 4781 43 15.62ms
14° 0.60V 60.0% 5313 43 14.85ms
16° 0.62V 73.7% 5781 43 14.85ms
17° 0.62V 82.0% 5938 43 14.34ms
17° 0.64V 92.5% 6406 43 13.82ms
17° 0.64V 90.2% 6844 43 6.91ms
21° 0.62V 10.2% 5844 14 1.02ms
46° 0.55V 42.4% 4594 0 6.14ms
34° 0.62V 52.5% 4625 14 10.24ms
26° 0.64V 54.9% 4719 41 15.10ms
12° 0.70V 56.1% 4906 43 15.10ms
14° 0.70V 57.3% 5094 43 14.59ms
15° 0.72V 69.0% 5375 42 15.10ms
16° 0.72V 76.1% 5531 43 14.85ms
17° 0.72V 78.8% 5688 43 14.59ms
17° 0.72V 88.2% 5750 43 14.59ms
17° 0.72V 93.3% 6063 43 14.59ms
17° 0.72V 100.0% 6156 43 14.34ms
17° 0.74V 100.0% 6281 43 13.82ms
17° 0.74V 100.0% 6469 43 13.82ms
17° 0.84V 10.2% 5969 21 1.02ms
43° 0.60V 10.2% 4844 0 1.02ms
48° 0.59V 10.2% 4625 0 1.02ms
48° 0.57V 10.2% 4469 0 1.02ms
48° 0.55V 10.2% 4406 0 0.00ms
48° 0.64V 10.2% 4156 0 0.00ms
********************************
During neutral:
TIMA O2-R TPS RPM KNCK
7° 0.18V 10.2% 1000 0
7° 0.18V 10.2% 969 0
10° 0.18V 10.2% 938 0
11° 0.18V 10.2% 906 0
12° 0.18V 10.2% 844 0
14° 0.18V 10.2% 750 0
13° 0.18V 10.2% 719 0
11° 0.18V 10.2% 719 0
7° 0.18V 10.2% 719 0
6° 0.18V 10.2% 750 0
4° 0.18V 10.2% 719 0
7° 0.18V 11.0% 719 0
7° 0.18V 11.8% 813 0
8° 0.18V 13.3% 969 0
13° 0.16V 14.1% 1250 0
22° 0.16V 17.3% 1625 0
30° 0.16V 20.0% 2031 0
33° 0.12V 35.7% 2813 0
31° 0.10V 44.3% 4281 0
35° 0.10V 100.0% 5625 1
30° 0.18V 100.0% 7531 0
30° 0.14V 10.2% 6844 0
**********************************

 

[blackGSX2g]

Post a WOT (100% tps) run for your log to get accurate readings. I like to start around 2k in 3rd gear for logging runs. That way I get the full specrum of readings.

 

[a73_4g67]

Post a WOT (100% tps) run for your log to get accurate readings. I like to start around 2k in 3rd gear for logging runs. That way I get the full specrum of readings.

I see. I'll do that next time. Base on the log, do you think my o2/knk sensor is whacked?

26° 0.64V 54.9% 4719 41 15.10ms
12° 0.70V 56.1% 4906 43 15.10ms
14° 0.70V 57.3% 5094 43 14.59ms
15° 0.72V 69.0% 5375 42 15.10ms
16° 0.72V 76.1% 5531 43 14.85ms
17° 0.72V 78.8% 5688 43 14.59ms
17° 0.72V 88.2% 5750 43 14.59ms
17° 0.72V 93.3% 6063 43 14.59ms
17° 0.72V 100.0% 6156 43 14.34ms
17° 0.74V 100.0% 6281 43 13.82ms
17° 0.74V 100.0% 6469 43 13.82ms

I've tried riching above 3k rpm, but cant get the o2 sensor voltage to go up and cant also shake off the knock.

 

[desertspyder]

Man you were barely pressing the gas. Anyway, about that o2 sensor question..

 

[slickndual87]

My o2 went out, and it just made black smoke.. and it idled rough

 

[AL92]

You are showing very lean with massive knock.Check fuel pump,afpr if you have one,
fuel filter should be changed.
Try richening up your tuning on the safc unless its not working. Change out 02 but your knock tells me you are mega lean just like the 02 is showing.