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145269

Pretty basic build. 5.7 with COMP HRT stage 2 cam, exhaust. otherwise stock.

:cheers:

So I have a newish problem. In the attached log with the slightest application of throttle at idle it stumbles and all most stalls. Will idle at .2-.21 volts fine, add a bit of throttle, like...

I don't have as many tables to control as the GPEC OS. However as another tid bit of info, the rich condition is noticeably worse when the temp is at or below freezing.....I only have a few tables...

I have played with Air flow as well but with little effect... Only thing I have really noticed is the Injector pulse wide is pretty big at start up when cold. (7ms)

144431 cold start
144432 after cold start
144433 current tune
COMP HRT stage 2 5.7 GC

I cant figure out what Im missing, On cold starts its crazy rich ( wideband at 10-11:1) then once it...

So I'm having a nuisance light throttle hesitation that I cant figure out. It only happens at a very light throttle input and really only noticeable from a stop. Also worse in reverse for whatever...

I dont think you can anymore in the newer version of HP tuners. I did mine on older version but I cant change it now....

Finally spent a bit of time on this, made a some small changes and got a log. its getting better, still dialing the fuel trims again.
Couple minor things I've noticed. Typically on cold starts...

Thanks for the help so far. I did see what you did on the 0824 current with the rpm rescale. I have smoothed out he big jump in timing there ( I'm surprised I didn't catch that as it was pretty...

It didnt like the changes at all
[ATTACH]136470

part throttle surge then stalled

I couldnt find the powertrain throttle request...?

Honesty probably nothing. Other than me trying different things the more I read other posts and trying things. Likely got to a point where somethings worked and other didn't and the combinations...

So I loaded the attached tune from a while back. it doesn't surge, idles ok, drives ok but feels like slug. it does however kick down when you stomp on it.

136419
136420

Just recently I noticed.... However I will load a different tune and see if it was something else I did.

545 :pray:

Yep.

One other thing Ive noticed is that it doesnt down shift the same. which I kinda understand as the throttle voltages and air flows have changed a bit. Its really only if I really romp on it it will...

Well dang!! That made it 100 times better than I could figure out!! Much appreciated!!

Attached is the log after I made your changes if your curious to see the fuel trims. It does have a a...

Thanks Ill have a look at what you did and let you know how it goes. Been away so just getting back at things.

Hey all I thought I had my surging sorted but seems not. I had made progress in open loop so I thought. Started idled in P/N and in drive, now spart throttle stumble or anything. fuel trims seem...

I think i go mine sorted by playing with FA Cold table and Start Up Air flow tables mostly.

Got it sorted out for the most part. dropped PT spark in first three columns and smoothed out. That then created idle surging which I seemed to tame with increasing the Min air flow table in the...

135402
135403

I am still having a big stumble at a very slight touch of the throttle. it does seem to be worse in reverse which leads me to believe its an air flow issue. im just not sure how...

So start up rpm swing/surge is better after adjusting start up air flow and fixing my pt spark table. Air flow made the biggest change. B1 and B2 sensors are still weird at the 70 ish second point...

Table not available on NGC4..

Shoot ya I forgot I put a big dip in the timing there, that was an experiment for a different issue and I missed putting it back. However the O2s have been all over the place for quite some time, ...