Hey everyone. I am new to this site, but not new to the 3800 world. I'm a member of a few different W-body/3800 forums, but none of them seem to have an active PCM / tuning section, so here I am, trying this one. I have a Powrtuner FWIW.
My issue comes on a cold start. The car will run slightly rough, with vacuum on my Aeroforce gauge being between 8.4 and 9.2 in PARK, depending on how it wants to act(which I know is between ~17 in hg and 18.5 in hg). When the car warms up, after roughly 2-4 minutes of running, the idle becomes great and the car runs like it's supposed to. Vacuum at idle on the Aeroforce is 9.8-10 (close to 20 in hg). I've already changed the MAF sensor, twice. I had this same issue while running a ZZP PCM, now it has started happening with my other PCM (from Milzy, if anyone here knows of him). The only tuning I have done is reduce WOT timing. The check engine codes I'm getting aren't related (EGR delete, AC removed, brake switch (could be a wiring harness issue), and evap - which is bypassed)
No vacuum leaks, newish crank sensor, cam sensor, MAF, TPS. I have 60# injectors, but haven't needed to install them yet. I'm on a 3.1 pulley on a Gen III blower. Tonight I'm going to disconnect the battery so the PCM has to relearn everything, but I doubt I'll see any results with doing that.
Basically, I'm just hoping somebody here knows about tuning and possible problems that can be read with a Powrtuner. I hope someone here can help.
Thanks!
John
