Hello,
I am hoping someone can lead me in the right direction. I have been chasing a rough idle (at warmup), lean tip in (under certain conditions), and constant raw fuel smell. To complicate things a bit more, this is on an 0411 swap I did to a big block. I've got 100+ flashes to the ECU and once warm the car runs fantastic other than the lean tip in (occasionally) and the horrible raw fuel smell. After a lot of research I have narrowed the issue down to what I believe to be EOIT. I have been pretty fortunate to have grasped just about all the concepts on google and HPT forum. This just seems to be something that is not clicking, I'm honestly lost. I read the 25+ Page dissertation in regard to it on here, but honestly it left me more confused than anything else. To complicate this a little more, I am using a 0411 ECU with a 02 Suburban 5.3 tune file that has been revamped to run the older style big block. So I was able to draw the conclusion that there is an issue based on a comparison of both tune files. I am going to post below all of the information I have accumulated. I am hoping someone can point me to a definitive conclusion as to how to set these two tables or better yet a set of guidelines to use when calculating this and setting the tables for this in the future. I think part of the problem is, there seems to be more GEN 4 information on this topic than GEN 3, and the information seems to flow together in a way that makes it harder to understand. Or I'm just not that smart, that's very likely as well . Hopefully this thread will serve the purpose of outlining some sort of process for those seeking to fix the same in the future.
Current File Settings - Pretty generic for most GEN 3 4.8, 5.3, 6.0 SB
EOIT Gen 3.JPG
This is a screen shot of the stock settings removed from a Vortec 7400 which would closely resemble my engine if NOT for the cam
EOIT 454.JPG
This is a copy of the specifications of the Cam used from Comp (Part#11-423-8 XR27HR-10)
Cam Card 454.JPG
Here is a copy of the cam card from the engine builder. It appears as though he advanced it .25 degrees from the centerline
21324-MMS-1546447949375-attachment1-20190102_115030-1.jpg
I believe this is what really confused the heck out of me. This seems like a great comprehensive tool, but unfortunately I can't seem to put it together. This was removed from an HPT forum thread that was posted in Feb of 2018. I don't know who to credit it to, but as you can surmise from my lack of understanding it, I sure as hell didn't create it.
DWR SOIT EOIT Worksheet 041715 (1).xls
-Dan