[dbral]

Did some tuning and learned some things. With the good advice/knowledge from a coworker that has 20+ years of tuning exp. and our stock GA 3.4 at home to compare things to, I was able to get the Alero running pretty well using HPtuners. Other than properly routing the PCV a few months ago, the change that made the biggest difference was bringing the main VE table back to stock-ish settings (Before and after in pic). This made a HUGE improvement in bottom end power and overall smoothness. The next best change was adding timing in the 400-1200 rpm range and adjusting the TPS voltage/throttle blade angle to match our GA's. This brought IAC counts way up and smoothed the idle with or without A/C on. I set the idle to 975 and that took away the harsh F40 6 speed idle clunking and clanking. It now sounds like a light rumble instead with the clutch out in neutral. The car feels and runs totally different from idle to mid range. It has good bottom end power now and the engine can be lugged at low rpm without issue and no more cold morning 2k idle flare....so far lol.

A weird issue popped up after all of the changes were made. With the A/C off and the clutch depressed the idle intermittently will hunt from 600-1100....but only if the car is moving. Once VSS hits 0 mph, the idle surge goes away. Have yet to figure that issue out. Does anyone know what might be going on there?

As others have mentioned here before, HPtuners does not have many tables unlocked for our cars and it seems that there is a lot of cause and effect going on behind the scenes in the PCM making it even more confusing to me. The Scanner only has a dozen or so parameters to view and log so that does not help. The LS people have all kinds of buttons to push and things to look at lol

Top table is before and bottom is after changing the VE table. Guessing MMS was trying to tune for the PCV they screwed up possibly? The tuner that was helping me just shook his head when he looked at that table.