$0D TBI to MPFI conversion, how is your idle quality?

[96lt4c4]

I have done all the necessary changes in the bin and the mod to the PCM. My idle seems to be a tad rough, almost like a miss. I installed a new cap, rotor, and MSD wires while I had it apart. The truck starts great and runs good other then just a slight issue at idle. Just wondering if there is something I missed in the tune. The injectors are stock LT1 with about 60K miles on them running at stockish LT1 fuel pressure 40-43 pounds. I have not had a whole lot of time for tuning a logging. I am going to hook up a vaccum gauge this weekend and maybe readjust the valves to see If I can find anything there.

The truck has always had a wierd issue that I cant seem to figure out, where Acceleration Enrichment activates at idle randomly. I maxed out the MAP qualifier to enable AE at idle and it still does it.

Here is a copy of the current bin I have been playing around with.

[Fast355]

I have done all the necessary changes in the bin and the mod to the PCM. My idle seems to be a tad rough, almost like a miss. I installed a new cap, rotor, and MSD wires while I had it apart. The truck starts great and runs good other then just a slight issue at idle. Just wondering if there is something I missed in the tune. The injectors are stock LT1 with about 60K miles on them running at stockish LT1 fuel pressure 40-43 pounds. I have not had a whole lot of time for tuning a logging. I am going to hook up a vaccum gauge this weekend and maybe readjust the valves to see If I can find anything there.

The truck has always had a wierd issue that I cant seem to figure out, where Acceleration Enrichment activates at idle randomly. I maxed out the MAP qualifier to enable AE at idle and it still does it.

Here is a copy of the current bin I have been playing around with.

IAC AE??

[96lt4c4]

My upper threshold for IAC AE was 3.9, the stock bin from my truck was 2.3? I compared my bin to one that I had found from a 95 Z71 years ago, AIXZ, I changed it back to my stock setting.

[96lt4c4]

Looking through some CPI bins, and notice the have Synchronous Idle set, I thought that was TBI only?

[JeepsAndGuns]

Its been so long since I installed my MPFI system, I cant remember what my idle was like before. It does kinda sound like it has a larger cam in it, semi chopy like a bigger cam. But its a comp cams 256XE, not realy crazy. I really like it, I get lots of comments about how good it sounds. So it doesnt really bother me. I have idle set for 650 rpm.
This is also on a AMC 401, not a chevy engine, so its gonna be different.

[dave w]

I had to make adjustments (trial & error) to the Async parameters to get a good $OD MPFI idle.

dave w

[96lt4c4]

Its been so long since I installed my MPFI system, I cant remember what my idle was like before. It does kinda sound like it has a larger cam in it, semi chopy like a bigger cam. But its a comp cams 256XE, not realy crazy. I really like it, I get lots of comments about how good it sounds. So it doesnt really bother me. I have idle set for 650 rpm.
This is also on a AMC 401, not a chevy engine, so its gonna be different.

This is the cam I have, really has no chop to it at all. Idle was pretty smooth with the TBI, now I have just a tiny issue that feels like a miss.

http://www.lunatipower.com/Product.aspx?id=1982&gid=287

I gave it some more timing at idle, that helped some. Idle is set to 700 RPM right now. My vacuum on the gauge is around 18 inches, about 40 KPA while scanning. I checked the plugs and they look good. I did have a drivers side header gasket leaking so I fixed that today because my wide band was showing a tad lean. I need to do a free air calibration on it as well. The truck runs really good, and the idle issue is not real bad either but its there now and wasn't before the swap. It almost has to be something in the .bin. I have played around with the idle over and under speed tables as well as the proportional idle tables and nothing seems to be helping it.