ScanGauge II IGN variation in S1a stage?

[also posted in Technical Discussion but then thought this forum might be the right one]

Folks,​

I have an SGII (firmware 4.02) that never showed a negative IGN (not even in stage s1a) before I cleaned the MAF sensor (which wasn't noticeably dirty, just thought I would clean it at 48K miles). Now it does show negative IGN in stage s1a but the value is not the constant -5 that I remember reading somewhere it should show in s1a. It varies among -1, -6, -2, etc.​

Anyone else see this behavior? If not, what values do you see in s1a? Before I cleaned the MAF sensor (took it out, sprayed CRC cleaner and put it back in), I would see a - AFTER the RPM number in s1a, but now I don't see the dash anymore there, but before the IGN number, but what causes concern to me now is that the number varying in s1a.​

Thanks.​

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