We have been tuning on my buddies 99 Z28/M6 Stage 1 H/C car for the past 2 to 3 weeks. After a long dyno time and lots of pulls it was making great power with a great A/F of like 12.7:1 or so. Over the next week it was like the computer slowly lost the tune we had and started to throw codes again. It seems to ahve a bad problem of loading up and running real rich at idle and then at WOT its still running rich. Like 12.0 to 11.5:1 A/F. Everytime that we get a good program in it and get running great and idle great, the computer seems like it slowly just loses the program that we just put in it.

Now that that you somewhat of a background of what we have been going through, has anyone else been having problems with the computer not keeping or not taking a program that they try to upload in to it? This has been driving us nuts and we can't figure out why it won't keep the program in it that we put in it. Anyone have any ideas on whats going on here? TIA.

 

Bump^^^^

Anyone have any ideas on this?

 

What tables did you tweak? Sounds like your Ltrms are relearning.