What app are you using with the OBD2 BT? Torque app for Android has the PID for Grand Prix's and also shows KR. I purchased the full version ($5), so for $25 total, I've got whatever gauges I need, lol...
It also records data/scans, I use CSV format so I can look at it in MS Office...
check the Torque app webpage/forum, there's info there.
If you're throwing a P0171 code (lean fuel condition), that pump you put in might not be doing you any favors... but I'd refer to some more knowledgeable people here on the forum.
Regards!
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