I been running truck in open loop all winter and now want to put in sem-closed loop. When I put in sem-closed loop the truck runs lean. When the truck in open loop it run right where it need to be. So do need to start loging the short fuel trims to get dialed in? Here is my log file sem-closed loop and open loop log. Let me know what you think. My log files were to big and you need to rename the file open loop.tun to open loop.zip.
Thanks for the help

 

bump!!!!!!!!!!!

 

I guess know body has answer. Here is my tune as well

 

I cant open your files because I have HP tuners. Is your MAF disconnected? and are your p0101, P0102 and P0103 set to fail on first error? Thats a few of the things that will effect going back to closed loop. You should not have to change VE more that 3-5% after re-enabling st and lt fuel trims.

 

Mine ran lean when switched to semi open loop until i got the ve dialed in perfect.

 

Looks like you've been playing with the transient tables?
Have you had any luck with that?
Have you asked this question over on the EFILive forum?

 

I changed my switch points on my 02 sensors so that afr floats beween 14.8 and 15.5. Now i just need to find out why truck leans out 16 to 17afr for 30sec to 1min at start up.