i was watching my LTFT and it seems like on bank is consistently higher.

one would run -3.6%, while the other would run -1.5%

is this a sign the O2 may need replacing? or maybe an exhaust leak?

i have an ORP and i know one sensor is before the manifold-ypipe flange, and the other is after it...could i have a leak? it's only been on for a few thousand miles.

 

That's basically having a BLM of 123 on one side and 126 on the other. Not really enough difference to be significant. You might want to plot the values for Cells 1 through 16, so that you can see if the difference is the same at all RPM/engine load levels. Just looking at a single Cell (if that's what you did) is not enough.

 

i'll give that a try...


now i just need to figur out how

thanks

 

Since you're using Autotap, add the Fuel Trim Cell to your logging.

Then take the LTrims and Fuel Cell data (there are 18 cells I think) and put them into an MS Excel spreadsheet so you can plot it.

Then you can compare both sides across all fuel cells to see if the difference is always the same..

What I can't tell you is how to get the car to enter into every possible fuel cell so you can get those values, but driving and loggin under various driving conditions should get you most of them.

 

using software from www.obd-2.com

not autotap.

still learning some trick with the software

 

I just noticed you are running an LS1.... ignore the reference to "16 cells"...... the LS1 has a completely different cell matrix than the LT1, at least in looking at the AutoTap numbers from my 2001 Silverado 4.8L. You still need to get the LTFT's for various cells, I just don't know the reference numbers and how they are arranged in the LS1 PCM.

 

thanks fred,

this whole thing is a learning curve. i'm still figuring out how to look at the "enhanced" info...hoping that will help.

right now i'm concentrating on tracking/curing a random misfire that i'm getting...so the computer stuff is on hold.