Odd spark behavior in SD

[robof16]

I have concurrently developed the same tune to run CL with MAF and OLSD (DTC confirmed) and have noticed significant erratic spark behavior in SD not present with the MAF-enabled version. It is very apparent in the logs and while driving. I first noticed under high load, the SD tune selecting lower spark values as if pulling from the low-octane table but ASPARK is 100% for BOTH in the logs under the same conditions. Now, I see it is happening in all conditions. As a result, the CL tune feels smoother, especially under load and pulls harder because the spark is consistently following the high-octane table.

The photo shows a short SD log and just after frame 1150 you can see where the anomaly starts. This is the first time I’ve seen it change from smooth to erratic. It is so significant in light load situations like the one just after frame 1610 that it feels like a misfire.

[nonnieselman]

Try to copy Hi octane table to low octane table.

[robof16]

I really didn't want to do that so, I thought, what if I switched the MAF DTC's from Non Emissions to Not Reported? It seems to have worked.

[robof16]

2nd SD log with no spark issues... Looks like it's fixed.

[nonnieselman]

I really didn't want to do that so, I thought, what if I switched the MAF DTC's from Non Emissions to Not Reported? It seems to have worked.

It was just a test.

[robof16]

oh... Cpy.
Thanks for the replies.

[robof16]

Since it changed during the posted log, as the truck warmed up, I thought it could be ECT related but apparently not.

[nonnieselman]

I dont see a log that was posted.

[robof16]

I meant the photo attached to the original post

[nonnieselman]

Its hard to look at a picture of a log. Uploading it helps a bunch.