Originally Posted by Kris
I had similar issues with my car, in fact... I had it VERY bad (18-18.5:1 AFR until the car reached 170+ temps).
I recently changed the ECT Enrichment table values in the startup temps to 1.1 and while I do still get some lean condition at startup, it decays off TONS quicker than it did before.
Why it helped i'm not really sure, since the ECT Enrichment table affects the Commanded AFR, and since I have no fuel trims... it really shouldn't do anything, but it does. :)
The ECT Enrichment table i'm referring to is the one in the Custom OS calibrations. My .tun is on holdencrazy, i believe it is the only Pontiac tune listed.