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-   Bonneville GXP/ Northstar Powered Cars (https://www.gmforum.com/bonneville-gxp-northstar-powered-cars-107/)
-   -   02 sensor lean/rich transitions (https://www.gmforum.com/bonneville-gxp-northstar-powered-cars-107/02-sensor-lean-rich-transitions-250542/)

Custom88 01-26-2007 01:39 PM

02 sensor lean/rich transitions
 
I got an Auto-tap today with the GM enhanced peramiters and did a few readings on my car. I did one specifically on the 02 sensor and transitions between lean/rich in a 100 second span. In a little over a minute and a half, there were only 71 transitions. Doesn't that seem pretty low? That's less than one transition per second!

harofreak00 01-26-2007 01:43 PM

yes.. i would think it to be about 10 times a sec...

Custom88 01-26-2007 01:56 PM

1 Attachment(s)
on a related note, here's my first scan with a few peramiters on it. I deleted about half of them on the table though because they were just system scans like "OBDII system ready, etc.)
Attachment 54264
Everything seems to look pretty good. It's good to atleast know I'm getting 0 knock retard. :lol: I'm running premium right now though so I'm going to see what it does in a week when I put regular in it.

Custom88 01-26-2007 02:35 PM

1 Attachment(s)
Here's readings from just the oxygen sensor/engine speed.
Attachment 54262

I don't know what it all means, so if someone could clarify.. it seems like the sensor is pretty slow to respond?

BillBoost37 01-26-2007 02:42 PM

Custom.. when you have that many parameters..it's only reading at the interval mentioned next to the data, the toggling can be happening much more frequently.

Custom88 01-26-2007 02:44 PM

Quote:

Originally Posted by BillBoost37
Custom.. when you have that many parameters..it's only reading at the interval mentioned next to the data, the toggling can be happening much more frequently.

True, but when I ran the test for just the oxygen sensor graph, it was still updating five times per second. You can see the MV of the sensor slowly rising/climbing on the graph. It looks like it takes a little over a second for the sensor to switch from lean to rich.

BillBoost37 01-26-2007 02:46 PM

Time for a fresh one..

How's MPG?

Custom88 01-26-2007 02:51 PM

This time last year I was averaging 25.4 MPG. Right now I'm averaging 19 MPG. :shock: I can't even get over 22 MPG on highway drives. it's sad. :lol:

BillBoost37 01-26-2007 02:54 PM

Your new tool just spent $80 for you. However the MPG return should be worth it.

banned3800 01-26-2007 03:43 PM

Custom, I think I am in agreement with Bill... seems the sensor is a bit on the slow side to toggle, Its functioning withing the proper range, but the toggle rate seems sluggish...

Even on my Old beater I can watch the mv on the sensor, as well I can watch it toggle rich lean.... In a 5 second period I usually see rich,lean,rich,lean,rich,lean...

If you have dropped that much milage and can do no better than 22 on the road you may be due for a new O2... Heck even 3.5 Shortstars should do better than 22 on the road with that 4T65-E ;)

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