07 Trailblazer SS, Cam, Longtubes 2 bar SD OS. More advanced questions. LOG/Tune
I have exhausted my knowledge. I am now to the point where I dont even know what to search for and what things to monitor in the scanner.
As the title states, its an 07 Trailblazer SS (e67), with longtubes, an unknown cam, intake, running the 2 bar enhanced SD os.
I have the open loop tuning within 5%, actually more like 2-3% in most places. I have very little knock retard going on and over all it runs well at operating temperature.
The cold start is rough/lean in ambient temps below 50 degrees, it gets rich when warm sitting in traffic, and actually runs better/smoother in open loop than it does in closed loop.
I have logged many hours adjusting the ve table and now have decided that I am chasing my tail. I need to figure out a few things, that i dont believe are VE related.
1. Even when the afr is good at idle (14.6-15.0), the truck doesn't idle smooth, and can actually even puff a little smoke, and exhaust is super fumey.
2. The ignition advance bounces around quite a bit at idle, but is buttery smooth when steady state cruising or accelerating.
3. Is there a way to log what modifiers/advances are active that would be affecting the base ve and timing maps?
4. Is there a way to filter out EQ error during decel?
I have been trying to read up on injection timing. It can be confusing. Most of the how to's suggest that knowing the cam specs helps a great deal when tuning the injection timing, i dont have the cam card. The previous owner does not have it and the installer says he doesnt remember as it was 6 or 7 years ago. I made a few changes to the injection timing tables but it didnt seem to have any effect in either direction.
What do you recommend I log to tune these issues? I have attached a log and a tunefile to this post. I would be more than happy to make fresh logs under any circumstances you recommend with what ever pids logged you suggest.
Thanks guys.
Im trying to get this truck to be a nice family daily and right now I have a pissed off wife and kids who cant stand the smell of daddys car. :banghead:
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Rich