E38 no misfire data

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January 28th, 2023
Autovation

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E38 no misfire data

Heres the story.....
I swapped a LC9 into my 07 Avalanche , added a 70mm turbo in April of 2021. I had some lean tip in problems that would come and go. Ditched the MAF and tuned it for SD, voila no more issues. Its got almost 60k miles on it without any major issues.

Recently it developed a misfire anywhere above 8 PSI (boost controller is set to 10.5). I noticed that logging any misfire data came up with nothing, multiple scan tools same issue.

I'm not seeing anything in the tune that would give me this issue. Is this just a product of running SD on an E38?
Could someone give the tune a once over and see if I'm missing somerhting?
February 1st, 2023
joecar

I haven't looked in your ctz, but the MAF DTC may be preventing the misfire detection.
February 1st, 2023
Autovation

Quote:

Originally Posted by joecar

I haven't looked in your ctz, but the MAF DTC may be preventing the misfire detection.

Thank s Joe, let me know when you get a chance to look

I'm thinking it may not register misfires in SD because it's looking at airflow differences for misfires data. No MAF, no airflow data? I don't know, maybe?