02 sensor help

So I've been looking at 02 sensors.. Basically what I'm wondering is, if the upstream sensor I have, will work with one of the cheaper ones on rockauto. Because the ones with the 'plate' with two bolt holes are cheaper. The types w/o the plate like my current upstream one is way more expensive. So are those plates required? Or can I use the cheaper version and thread into that pipe w/o the plate?
(Ignore my coolant leak, that's another issue I'm dealing with)
Upstream:


Here is a list on Rock auto. The one listed above is the cheapest, which is the one listed at the top in pic below. But it has the plate on it.Then they go up in price for the ones w/o that 'plate' and are not Denso.. From what I've read Denso is the best for our trucks.. (Found on Amazon for $90 for denso)
***So can I use the denso w/o that plate or is it not removable and have to get a different brand for my upstream?***


Untitled by toendanger, on Flickr







Downstream: Although I dont think I need to replace this one.

 

Well I guess desktop view doesn't work anymore on my phone at least. Tried to make that pic bigger. Works on pc. But I'm sure you get the idea of what I'm talking about.. thanks in advance.

 

I just got the cheaper, upstream 02 sensor from Rock Auto. They. An be used both ways. They come with a plate that you can screw the sensor into or not use the plate and screw it into the hung on the pipe.

 

Alrighty then. Thanks!

/thread lol.

Actually, quick question. Can an 02 sensor go faulty but still appear to be working? As in fluctuating volts a little and not throwing a code?

 

What voltage are you seeing on the upstream sensor?

 

Are you getting an Check Engine trouble code light in the dash? If you need one make sure its DENSO or NGK, Rockauto or Amazon are usually the cheapest route.

 

Oh sweet. Gonna test it soon then. On the scan tool it was showing ~3.2 volts. And fluctuating but only a bit within that 3 volts. I got a p0170 too lean code. Cleared and hasn't come back on, yet. Might not have enough miles for it yet to reappear. Rear 02 was around half a volt and fluctuating a tiny bit. They didn't appear to be 'frozen'.

I just got my new exhaust system in with a high flow cat. Btw. I'm looking into multiple causes. have a couple dif threads this was just to specify what 02 sensors would work. I'll be getting the denso on Amazon IF I find it to be out of spec. But so far I think its working. I'll test the ohms.

 

If I'm not mistaken, the upstream sensor should be fluctuating rapidly between .2v to .9 volts. And the downstream sensor should fluctuate slowly around .5v.

My upstream is stuck at 1v and my downstream sensor is fluctuating around half a volt. So I think my upstream is bad.

 

How many miles on the truck?

 

Mine? Just over 95k.

 

Since you have cleared the code I would wait to see if it comes back on before buying a new sensor,could be just fluke since you installed a new high flow cat back exhaust. My original o2 sensors lasted over 200k.

 

Here's a screenshot from my torque app.

Not sure about the emissions test. After I drive it a few more miles to make sure the code doesn't pop, I'll reset and see if the cat and emissions test will complete.

 

And a couple more of all the different sensors I'm running, at different rpms. Lemme know if anything looks out of the ordinary.
Not sure if the mileage is accurate. Most likely not. But it is higher than it was before I did the new exhaust. As I believe my cats were clogged. But she still feels gutless...
As if the maf or 02 sensor isn't working properly. Still 'feels' the same like I didn't even do anything to the exhaust even though I'm sure it's much higher flow now.

 

Any input on the upstream voltage of over 3 volts? Everything I read up on says it's supposed to be between .1 to .9 volts. And the rear is where it should be around .5...

On a side note, I hooked up the scanner again and before I started the truck, it showed a p0450 which is evap pressure sensor switch. But when I turned the truck on the cel was not on. I cleared the code anyways. She seemed to be running beautifully today. Almost like it's intermittent. I have not tested the ohms on the sensor yet. Just stumped why it's showing so high a voltage. Could not find any references anywhere with similar issues..

 

An update with some thoughts of mine regarding the issue I'm having...

So my air filter, is a Donaldson Powercore Filter. It is possible that it isnt supplying enough cfm. May be why my performance/power loss at higher speeds suffers more than when at idle. As if it isnt getting enough flow. Plus a combination of 33x12.5's and tons of light bars creating drag. I will see if I can get a bigger air filter to use and test. The Volant CAI calls for a cone oiled filter. I replaced that with the powercore filter with a (iirc) 4" flange on it and used a spacer to fill the gap for the 3.5" flange of the intake tube. I have since replaced it with the correct size flange (3.5) but the flange is shorter on this current filter and may be restrictive unlike the other 4" that had a slightly larger and longer flange. Idk I'm just throwing this out there as it's something I'm considering that may be contributing to my power loss. Again she runs really good. Just feels like I'm towing a trailer behind me when I'm going on the highways. If I punch it and get the rpms up, when she shifts, it bogs down for a second at the shift as if it's not getting enough fuel/air. Plus on hills/slopes she doesnt like to keep up and wants to downshift. Anyways.. Thats the story and symptoms.



So I did a few tests.. Here are the results:


Tested 02 volts front and back sensors:
I read up on the front 02 sensor as showing the 'wide range voltage' being normal. And that it is divided by 5 or something like that.

Front still reads ~3.28 volts and fluctuates.
Rear still reads ~.5 volt and fluctuates.

Created vacuum leak to watch for increased fluctuations:
Front sensor shot up to ~4 volts.
Rear sensor plummeted to .01 - 0.0 volts.

So it APPEARS that they are working within spec. I tested the resistance as well. And iirc it showed the upstream as having about 2 ohms resistance. Haynes says it should be between 11-16 ohms... So I'm a little confused with this. It appears that it's working as it should but the ohm readings don't fall within spec...???
EDIT: Forgot about this illustration posted above.. not sure why the book says 11-16 and the illustration here says otherwise:
According to this its within spec..

Also... MAF in haynes says grams/sec should be 4-7 at idle. Mine was showing 3 g/sec.. (this is why I'm thinking my filter is not big enough/restrictive.)
But it does appear the MAF is working just as it should.


Also figured out how to take some graphs on my torque app of the 02 sensors.

1st pic is the upstream sensor wide range voltage over a few seconds at 2k RPM.
2nd pics is the downstream sensor voltage

 

Anyone got any more input on my data?

 

How about you, did you ever figure out your problem? Was it the 02 sensor?

 

Idk. I gave up trying to figure out how to read all the data. I just went ahead and purchased both new sensors. Doesn't seem to run any differently. The rear O2 Was throwing the efficiency code and went away after the new one. I did also change my air filter to a conical r2c filter. She breathes a little better now as I can feel the difference. But I still suspect that something else is keeping her from running like a top. Oh well. She runs good enough. Hell there might not be anything wrong except maybe a timing adjustment, or valve adjustment. Not sure how much that affects things. And not mechanically inclined enough to tackle that on my own. Maybe one day I'll get to it. Idk.

Edit: oh and I did have to get a Bosch upstream sensor. The denso you cannot remove the plate. Not sure if this was done by the p.o. because from my understanding is that it calls for both sensors to be denso. Not sure if that's true or maybe an oem mid year change as it's an 01. But she's running just fine with a new Bosch up front and a new denso in the rear. Because in another thread there was some that hinted at it not liking anything but denso, or mismatched brands at that.