sd/ol tuned warm up going lean after about 145 degress

[Stealthy93]

lately ive been chasing a lean warm up issue after about 145 degrees, ive added fueling to the ivt table in that area to try to help and doesnt seem to do much. i also added to the vve table in the areas around idle rpm and map to see if that helped and nothing

[edcmat-l1]

businessman-looking-into-crystal-ball.jpg

I see it.....

[Stealthy93]

do you have any idea what this could possibly be

[gtstorey]

The hint was to post the tune. Always post a tune & log with the question.

[Stealthy93]

my bad, i have updated the post with the tune i have right now.

[edcmat-l1]

looks-good-to-me.jpg

Dumb VVE table.jpg

[Stealthy93]

Yea vve table a little botsched right now Im pretty new at it just been tinkering with it and have to drive it right now, but when the car is warm actually runs pretty good and going down the road I’m with in 2-5 %, just haven’t had to time to mess with idle.

[Stealthy93]

Could anyone tell me how that would effect warm up only after 140 degrees

[ns158sl]

Probably your IVT table. You can see it commanding rich until you hit the threshold and everything is (1)'s. Put it back into closed loop, put the IVT back to stock.

Have to dial in the main fuel table before you play with all the "adders" to fix your "issue"

[Stealthy93]

I’ve got a closed loop tun I throw in it when I drive it long distances, but was watching the wide band on warm up and it would surge till it got to 190 then run ok so I went open look to try and track it. While idling warm wide band slowly goes Rich and cruising areas were almost spot on. I know the table looks lean in that area but when idling it’s rich. Any ideas on why that is

[hjtrbo]

businessman-looking-into-crystal-ball.jpg

I see it.....

^^^

[edcmat-l1]

I’ve got a closed loop tun I throw in it when I drive it long distances, but was watching the wide band on warm up and it would surge till it got to 190 then run ok so I went open look to try and track it. While idling warm wide band slowly goes Rich and cruising areas were almost spot on. I know the table looks lean in that area but when idling it’s rich. Any ideas on why that is

Put it back in closed loop. Open loop tuning is dumb. The PCM is smarter than you and better at its job than you are.

The VVE is abnormally low in the idle area and it's a ditch or valley where no matter which direction it moves it's always up. That's just incorrect.

You've never mentioned the vehicle mods but I'm ASSuming it's the car in your sig with a stage 4 cam. And for that matter, you don't mention WHO'S stage 4 cam so the specs can vary pretty widely.

[edcmat-l1]

Probably your IVT table. You can see it commanding rich until you hit the threshold and everything is (1)'s. Put it back into closed loop, put the IVT back to stock.

Have to dial in the main fuel table before you play with all the "adders" to fix your "issue"

This right here. It has to be done a specific way. You have to dial in your primary airflow tables (MAF/VVE) at operating temp, then go back and adjust your modifier tables after.

Your VVE is not properly dialed in. I can tell by the shape.

Need to put it back in closed loop and use the fuel trims to dial it in. The fuel trims will lead you.

[Stealthy93]

Ok I’ll try that, is there any formula that I need t use to filter out cot and dfco while logging to filter out the lean and rich spikes for cats and deceleration for vve logging and do I use narrow band or wide band for logging. Also updated my sig that is the car I’m working on my bad guys.

Also is there any way I could log a possible leaky injector, vacuum leak, or valve no closing all the way with out have to physically check them thanks for the help

[Stealthy93]

Bump

[Stealthy93]

So I use long term fuel trims to paste into vve tables or do I need any formulas

Also is there anyway to tell by scans if I have a vacuum leak or valve held opened

[gtstorey]

Valve held open would cause a miss. Vacuum leak will be hard to determine from log since it isn't already dialed in. But if you think you have a vacuum leak at this stage, you need to confirm that you don't before you start dialing it in.

[Stealthy93]

hey thank you for all yalls help

The only miss i have is low rpm high load which shows its face during take off i figured that was due to the cam and the factory rear end but not sure

I did a smoke test and it showed a small leak but i didn't see where checked all over engine bay i figured maybe it was what was getting by the valves, should i loosen rockers and retest. also are there any vacuum lines inside the car that could be an issue if rat chewed

I attached 2 logs below one is warm up the other is a quick drive both of same run

my main goal is to fix warm up issue and idle portion of vve

At 11:51:25 on the second log is where the miss is there is about 2 or 3 others in there basically at same rpm and load


24-07-31 11-49-12.hpl
24-07-31 12-01-03.hpl

[ns158sl]

Log burst knock. Also fix your decel fuel trims or make DFCO more aggressive

[Stealthy93]

Ok I added burst knock but won?t dfco mess with my fuel trims while I?m logging