Auto VE Question

[bsteff]

De-screened MAF ?

No. K&N cold air intake.

[bsteff]

Are you sure short and long term fuel trims are disabled?

If you're having trouble finding the problem, try reverting to full closed loop operation and see how the system reacts. If the long term trims show the same type of correction values, it's a good bet that the problem is mechanical. Also, if you logged manifold pressure before you started, check your old logs. If manifold pressure is substantially different than it is in current logs, you probably have a vacuum leak.

When I go back to closed loop SD I get -LTFT's and BEN's <1. This is what I would expect with the VE table scaled up from stock. Can anyone find a problem with the way I set up the AutoVE tune?

[bsteff]

Problem Solved!

After some searching in the tune file I found parameter B4206 "Use O2 With Open Loop Commanded Fuel Table". This parameter was enabled on my stock tune. I disabled it and went out for a drive. BEN's in the 0.95 range, right where I expected them to be.

Maybe disabling B4206 should be added to the auto ve tutorial for people like me who have that parameter enabled on their stock tunes.

P.S. Thank you to those who repiled to this thread.

[Chevy366]

Great , I took a look (like I know anything) at the tune file did not see anything unusual , I did notice that the BEN for the LC-1 across the top you have the values in Metric , I did mine in Imperial which the values are 15-105 MAP , but I have Imperial values through out the Tuning software .