My H/C Motor is running Pig Rich at start up to warm up,when it is in Open Loop(Start up cold) What are the things I need to look at?I have got alot of things to correctThanks for the Help guys....Scott

 

Probably just need to adjust the open loop mulitiplier table. Log what your fuel multiplier is and I bet its pushing you really rich.

 

Yes, mainly because your idle MAP is very high with
big cams so it indexes you way up (this table has no
clue about RPM) same as if you were at 70kPa under
load. Shave back the cold enrichment at higher MAP
values. Doing this will also make the motor more
efficient at idle, lowering the MAP required to run
and improving things further.

Having a VE table that's also rich due to depressed
low-RPM pumping (from overlap) doesn't help any
either.

Fix the VE when hot and then the OLFA is what's
left hanging out, cold.

 

Ok Guys ,I will take a look at this stuff,I will let you know how it goes...THANKS!!!

 

How much do you suggest I lower the open loop multiplier???Please Help...

 

Jimmyblue my Open Loop Fuel multiplier looks like this
1.67 1.48 1.33 1.27 1.21 1.14 1.06 1.04 1.08 1.07 1.05 1.03 1.02 1 1 1 1 1 1
1.62 1.48 1.33 1.27 1.21 1.14 1.07 1.05 1.08 1.07 1.06 1.04 1.03 1.01 1.01 1.01 1.01 1.01 1.01
1.62 1.5 1.33 1.27 1.21 1.14 1.07 1.05 1.13 1.11 1.07 1.05 1.04 1.02 1.02 1.02 1.02 1.02 1.02
1.62 1.52 1.34 1.27 1.21 1.15 1.08 1.07 1.14 1.14 1.07 1.05 1.04 1.02 1.02 1.02 1.02 1.02 1.02
1.65 1.54 1.35 1.28 1.22 1.16 1.1 1.09 1.14 1.14 1.08 1.06 1.04 1.03 1.03 1.03 1.03 1.03 1.03
1.67 1.56 1.37 1.29 1.23 1.17 1.15 1.12 1.14 1.14 1.08 1.06 1.04 1.04 1.04 1.04 1.04 1.04 1.04
1.67 1.56 1.39 1.32 1.26 1.2 1.17 1.15 1.14 1.14 1.08 1.06 1.06 1.06 1.06 1.06 1.06 1.06 1.06
1.67 1.58 1.41 1.33 1.27 1.21 1.19 1.16 1.14 1.14 1.08 1.06 1.06 1.06 1.06 1.06 1.06 1.06 1.06
1.69 1.58 1.42 1.34 1.28 1.24 1.21 1.18 1.14 1.14 1.08 1.08 1.08 1.08 1.08 1.08 1.08 1.08 1.08
1.69 1.6 1.44 1.35 1.29 1.25 1.23 1.2 1.15 1.14 1.09 1.09 1.09 1.09 1.09 1.09 1.09 1.09 1.09
1.72 1.62 1.46 1.38 1.32 1.28 1.25 1.23 1.18 1.14 1.11 1.11 1.11 1.11 1.11 1.11 1.11 1.11 1.11
1.72 1.62 1.46 1.38 1.33 1.3 1.28 1.25 1.18 1.14 1.12 1.12 1.12 1.12 1.12 1.12 1.12 1.12 1.12
1.75 1.62 1.47 1.4 1.34 1.3 1.28 1.26 1.18 1.14 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13
1.75 1.62 1.47 1.4 1.34 1.3 1.28 1.26 1.18 1.14 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13
1.75 1.62 1.47 1.4 1.34 1.3 1.28 1.26 1.18 1.14 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13
1.75 1.62 1.47 1.4 1.34 1.3 1.28 1.26 1.18 1.14 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13
1.75 1.62 1.47 1.4 1.34 1.3 1.28 1.26 1.18 1.14 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13

What do you think? Thanks

 

What MAP (kPa) do you see at idle? That's the key;
a stocker might see a cold idle mixture commanded of
maybe 12:1 while a big cam car, maybe 11:1 at the
same temp just by that table column (let alone any
airflow inaccuracy).

That appears to be the same as my stock '02 tune.

On a T-Rex car I worked with, remotely, we ended up at
something like this:

1.67 1.48 1.3 1.15 1.1 1.06 1.05 1.04 1.03 1.02 1.01 1 1 1 1 1 1 1 1
1.69 1.49 1.31 1.16 1.11 1.07 1.06 1.05 1.04 1.03 1.02 1.01 1.01 1.01 1.01 1.01 1.01 1.01 1.01
1.7 1.51 1.33 1.17 1.12 1.08 1.07 1.06 1.05 1.04 1.03 1.02 1.02 1.02 1.02 1.02 1.02 1.02 1.02
1.7 1.51 1.33 1.17 1.12 1.08 1.07 1.06 1.05 1.04 1.03 1.02 1.02 1.02 1.02 1.02 1.02 1.02 1.02
1.72 1.52 1.34 1.18 1.13 1.09 1.08 1.07 1.06 1.05 1.04 1.03 1.03 1.03 1.03 1.03 1.03 1.03 1.03
1.74 1.54 1.35 1.2 1.14 1.1 1.09 1.08 1.07 1.06 1.05 1.04 1.04 1.04 1.04 1.04 1.04 1.04 1.04
1.77 1.57 1.38 1.22 1.17 1.12 1.11 1.1 1.09 1.08 1.07 1.06 1.06 1.06 1.06 1.06 1.06 1.06 1.06
1.79 1.58 1.39 1.23 1.18 1.13 1.12 1.11 1.1 1.09 1.08 1.07 1.07 1.07 1.07 1.07 1.07 1.07 1.07
1.8 1.6 1.4 1.24 1.19 1.14 1.13 1.12 1.11 1.1 1.09 1.08 1.08 1.08 1.08 1.08 1.08 1.08 1.08
1.82 1.61 1.42 1.25 1.2 1.16 1.14 1.13 1.12 1.11 1.1 1.09 1.09 1.09 1.09 1.09 1.09 1.09 1.09
1.85 1.64 1.44 1.28 1.22 1.18 1.17 1.15 1.14 1.13 1.12 1.11 1.11 1.11 1.11 1.11 1.11 1.11 1.11
1.87 1.66 1.46 1.29 1.23 1.19 1.18 1.16 1.15 1.14 1.13 1.12 1.12 1.12 1.12 1.12 1.12 1.12 1.12
1.89 1.67 1.47 1.3 1.24 1.2 1.19 1.18 1.16 1.15 1.14 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13
1.9 1.68 1.48 1.31 1.25 1.21 1.2 1.19 1.17 1.16 1.15 1.14 1.14 1.14 1.14 1.14 1.14 1.14 1.14
1.9 1.68 1.48 1.31 1.25 1.21 1.2 1.19 1.17 1.16 1.15 1.14 1.14 1.14 1.14 1.14 1.14 1.14 1.14
1.9 1.68 1.48 1.31 1.25 1.21 1.2 1.19 1.17 1.16 1.15 1.14 1.14 1.14 1.14 1.14 1.14 1.14 1.14
1.9 1.68 1.48 1.31 1.25 1.21 1.2 1.19 1.17 1.16 1.15 1.14 1.14 1.14 1.14 1.14 1.14 1.14 1.14


Not really gross changes, but brought his cold idle
commanded AFR back pretty much in line with a
stocker, given the idle MAP differences, at least at
more moderate temps; he was not being exposed
to temps below zero so we had no data / feedback
there, and we left those colums alone.

Peeling back the cold enrichment shouldn't bother
you much. If you found ping when cold you'd have
to make more adjustments but I think you'd have
to try pretty hard to get cold ping. You shouldn't
beat on it cold anyway, the way these things
rattle.

 

More details, please! What's the math behind this? I log the FAM pid... then how do I extrapolate the changes I need to make to the OLF/A table? Will my LM-1 make this easier?

 

Thanks Jimmy ,You are correct this is my 99 Stock multiplier,My Tuner never played with this table apparently,seems it looks like your 02.My KPA at start up is 40-50 at start up.From what I remeber some areas I was darn near at 10 A/F .I had changed these down by 10% what a differenceAfter Cold Start up my engine wasnt choking on fuelSeems how I dont beat on it when cold,I was thinking of changing the Multiplier table to all numbers being 1.00 Will this be ok?Thanks!!
Scott

 

I wouldn't put the table to 1.000 when real cold; think
of this table, in the X dimension, as your choke. You will
want some degree of cold enrichment I'm pretty sure.
But less oinking, probably better.

For anything above freezing I doubt you'd need to be richer
than 12:1 at idle. Though GM seems to have thought
otherwise. Where the wideband would come in handy is,
in separating the effects of the commanded AFR (FAM)
from this table, and the effects of other mods that might
compound the enrichment (specifically the VE table being
over-rich in effect). Cold start being open loop, can show
you both and the LM-1 would tell you whether it's all in
the OLFA table, or there's more to it.

 

Ok Jimmyblue I am still working on it,I think it is going to be a combination of the multiplier and VE....Thanks I will let you know...

Scott

 

Ok ,Now should I change the AfterStart Enrichment Initial Adder VS. ECT ?This table would make me even richer at start up right?
Thanks....
Scott