Stumbling After Cold Start

[90Vette]

Well, I took a couple datalogs where it was stumbling really badly, but ALDLDroid didn't save them for some reason (looks like there's a hidden 256MB limit for all saved datalogs?).

I took another this morning, but it didn't seem to be stumbling at all, which could have been for one of several reasons: it took a few minutes to get the datalog started, so it warmed up a little before I started driving; I left the house a bit later, so it was warmer; and it felt quite a bit less humid than previous mornings. It still sounded like it was idling rough though, so I'm attaching the datalog I took. (I attached a ZIP that has both the CSV and the XDL.)

I'll try to go for a drive early tomorrow morning to see if I can get a better log.

[90Vette]

Here's a better datalog. Still wasn't doing it real bad for some reason, wonder if it's weather-related.

[sturgillbd]

I viewed the first datalog this morn and didnt see anything that stood out. I need to find the more complete adx for 8D and will review both logs in more detail. I'll try to do it this eve but it may be late before I get a chance.

Brian

[90Vette]

Thanks Brian, really appreciate it.
What do you mean by the "more complete" adx?

[dzidaV8]

I have checked the log, you are running a little rich with BLMs around 120, and the moment you tap the throttle it gets momentarily lean from what I can see. Check your fuel pressure and have a look at the spark plugs.
If you still have stock injectors it's a good idea to check them or replace them anyway to D3 type injectors. Stock ones tend to finish their life after those 30 years.

EDIT: I read on other topics that your car is far from stock... I'd say to give it more AE on low temperatures in: "AE Delta TPS Pulse Width Factor Vs. Temp. ".
And work on the tune, log shows rich everywhere.

[90Vette]

Thanks for looking at my logs. I tried checking the fuel pressure before I drove out to VA, but the gauge I got from O'Reilly was leaking like crazy. I don't have time (or tools) to pull a spark plug right now, but the last few times I've had them out they've looked pretty sooty.

I've got new 33.3 lb/hr injectors, so that's not a problem.

Tuning AE was on my to-do list, but man does it look complicated. Here's my current table; about how would you change it?
AE Table.PNG

I have adjusted and updated my VE tables based on several long datalogs, but isn't it normal for it to shift rich and lean as temperature and humidity change?

[dzidaV8]

Right, the fueling can change due to humidity and temp, but I suspect you are hitting a weird transition on the VE table when this stumble occurs. Are your VE tables smooth? Try increasing the TPS AE factor at the temperatures at which the stumble occurs.
"AE Delta TPS Pulse Width Factor Vs. Temp. "

Try using the XDF I attached, I tweaked it some to make it more intuitive, make sure tu use it in category view.

[90Vette]

I've smoothed my VE tables pretty extensively, although there are a few little areas that are a little jagged. Here's the graph of my lower VE table:
VE graph.jpg

Whoops, found the right table. Here it is:
AE Table.PNG
It's stumbling around the 20 °C cell, so I guess increase it there from 1.00 to 1.25 to match the above cells?

Hmm, that's a nice-looking XDF. I like how you added the patches section - maybe I'll finally try patching my BIN if it's that easy. The XDF I'm using (wish I could give credit, but I don't remember who on this forum I got it from) breaks parameters up into sections though, which I've really gotten used to. Check it out. Maybe if I have time I'll make a hybrid of the two.