Cold start issuss

[SiriusC1024]

There's a few of those. Wouldn't happen to have the exact number would you? 218/224 .553/.553 110+0 is the V2, for example.

[TYLERJ98]

yes that is the exact one, i appreciate you helping with this thanks

[SiriusC1024]

Alright then here you go. Deka 80 info, and I sanitized the VE a little.

Use this then post a log, please. Include cylinder airmass, dynamic airflow, injector pulsewidth per bank, and STIT.

[TYLERJ98]

okay i will write and log this tomorrow i really appreciate it, tomorrow after work ill post it

[TYLERJ98]

LOG3.hpl
LOG4.hpl

It started really rough, had to adjust throttle some for the IAC so first log 3 is the original cold start, log 4 is the after IAC throttle plate adjustment

[TYLERJ98]

i had to give it throttle to stay running on the cold start it kept dying

[Alvin]

Its very rich. It doesn't make sense worrying about IAC counts right now. Get the fueling a bit closer, else you'll bake in extra air you don't need.

[TYLERJ98]

So I?m fully new to the tuning at all, what would get me to be able adjust that mixture down? I see that they are -30% fuel trims so it?s really rich, and then the o2 is 900mv

[SiriusC1024]

Adjusting the VE table based on the fuel trims. Tune is setup to use STFT's right now. LTFT is disabled, but there are residual values left. Please use VCM Scanner>Vehicle Controls & Special Functions to clear them. Load this tune and log.

[TYLERJ98]

LOG5.hpl
LOG6.hpl

still had to throttle it to get it started and when in open loop if throttle will die, log 5 is the cold start one, log 6 is after warmed up.

[SiriusC1024]

It's still pretty far off. Add STIT to the logs, too.

[TYLERJ98]

How to add STIT

[TYLERJ98]

I looked for that the other day when you said but I couldn?t find it

[SiriusC1024]

Specific Parameters>Engine>Idle>Idle Adapt (STIT).

[TYLERJ98]

its definitely getting better no throttle req for startup, it did die the first startup but it fired the second time and caught itself,


LOG7.hpl

[TYLERJ98]

take a look at this, im unsure if im doing it right, but my fuel trims seem closer but im unsure if this is correct still, this is the tune i adjusted the VE table some

log9.hpl


truck tune 1_Deka 80_SD_3 (1).hpt

[SiriusC1024]

Hey that's pretty good. Keep doing it and you'll get there.

For the dying at startup copy-with-axis your VE table to the Cranking VE table. It'll only do 3 columns, 400, 800, 1200rpm, but a linear interpolation between them will suffice. 1200rpm and up will be the same. Use horizontal smooth 3x between 280-400rpm.

[TYLERJ98]

okay thanks i appreciate it, so the goal is to get these fuel trims as close to 0 as possible correct? or do you just aim for +-10?

[SiriusC1024]

Within 5% if you can for VE.

[TYLERJ98]

is there something to adjust per temperature? it seems like it doesnt run right until it hits 180 degrees