2004 6.0 NV4500 Tahoe
- Thread starter Dantheman1540
- Start date
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OP
OP
Dantheman1540
Full Access Member
As long as you don't ask "is it in yet" your questions won't bother me.
randeez
Full Access Member
have you try adding/subtract some air flow from the base idle airflow table in the lower coolant temps?
baby steps...drag the 133* value back two cells and smooth it down to -40 cell....see if better/worse, it may want more flow in those cells
is it all start ups or just cold starts?
could try knocking down the "choke flow mode" its set at 50seconds, maybe put it on 10 or so and see if it helps
try and see what else "changes" at your 90sec mark
baby steps...drag the 133* value back two cells and smooth it down to -40 cell....see if better/worse, it may want more flow in those cells
is it all start ups or just cold starts?
could try knocking down the "choke flow mode" its set at 50seconds, maybe put it on 10 or so and see if it helps
try and see what else "changes" at your 90sec mark
Last edited:
OP
OP
Dantheman1540
Full Access Member
Where is the choke flow mode?
I had done a bunch of BAF adjustments and I have logged the desired IAF from cold starts to natural warm-up with no accessories multiple times so it should be fairly accurate but the symptoms seem to point towards that as the issue so I'll keep adjusting small increments at a time.
randeez
Full Access Member
engine>idle>airflow> 4th tab down on the far left column
if im looking at the correct old tune of yours
if im looking at the correct old tune of yours
pwtr02ss
Full Access Member
I ALWAYS know when you're in Daddy D
OP
OP
Dantheman1540
Full Access Member
Yep found it, I swear I go blind when looking for something new in there. It's set for .50 is that 50 seconds or half a second? Pretty sure it's half a second.
randeez
Full Access Member
oops yea i think youre right lol
OP
OP
Dantheman1540
Full Access Member
Also, the 90second mark is not a hard stop that's just an estimate and it genuinely seems to change, sometimes It gets better before I get out of my yard other times it doesn't get better till half a mile from the house. Which is what has made it so difficult to track down. Also many times the AFR does not log correctly the first minute or so of logging, it's like the algorithm has an error and it reads +100 in every cell. very possible the sensor is going out and is just taking longer to heat up but it really screws up the initial startup log data. The strange thing is the gauge will read correctly but the histogram won't log correctly. So many damn gremlins!
randeez
Full Access Member
yea thats what i assumed....thats why i would look at tables effected by coolant temp in : fuel, air, spark
and didnt see if you answered - is this on cold starts or all starts?
