Attempting to get tune correct so no gas pedal is needed on cold starts...

[sac811]

Basically have tried adding air with table B4343, but I can't seem to get my cammed lq9 to start and stay running without giving it gas on cold starts.

It only starts without pedal effort when it is up to operating condition.

I am posting a log of a cold start attempt without touching the gas I did this morning. It starts but dies a second later. Then have the full warm up logged in Drive. Also attached tune file

16032
16033

Any help?

[sac811]

No help?

[ScarabEpic22]

Read this thread and follow the instructions, should get you pretty close.
http://forum.efilive.com/showthread.php?14439-Idle-Tips-amp-Tricks

[sac811]

Read this thread and follow the instructions, should get you pretty close.
http://forum.efilive.com/showthread.php?14439-Idle-Tips-amp-Tricks

Already have all that taken care of.

It idles fine, I am trying to get cold start idle to occur without giving gas. Right now I have to give a little gas for a few seconds before letting off and idling fine.

Trying to get to where I just start the truck and it goes straight to idling fine.

[ScarabEpic22]

Look at B4343 and B4304 and the other parameters associated with that group of parameters.

[macca_779]

Add air to start up friction in the areas it's having trouble

[sac811]

I have already messed with b4343

The values below are what are in the tune file I have attached to my first post.

Do I just keep adding air until the problem goes away? Because its already higher than any idle tutorial I have seen so far.

My current Startup Friction Air flow correction
-40 F 15.500000
15.000000
14.500000
14.000000
13.500000
13.000000
12.500000
12.000000
11.500000
11.000000
9.500000
9.000000
8.500000
8.000000
8.000000
284 F 8.000000

[sac811]

Anyone have any suggestions after looking at my tune file and the log on what to do?

[joecar]

I'm still looking and thinking...

[slows10]

Cam specs?? Idles at 54-56 kpa Probably not real big I hope. Why are you setting the idle only 725 rpm? Comanded afr does not equal actual afr. How did you tune the ve and maf tables?

[sac811]

I'm still looking and thinking...

Thank you, appreciate it


Cam specs?? Idles at 54-56 kpa Probably not real big I hope. Why are you setting the idle only 725 rpm? Comanded afr does not equal actual afr. How did you tune the ve and maf tables?

Cam specs are 222/224 .604/.604 on 112 lsa

Idle rpm is 725 because it can idle at that just fine. Do you mean I should go lower?

If you mean higher, what is the benefit to a higher idle for cold crank or anything else?

AFR was determined with LM2 wideband, and Calc.VET was used for VE and MAF data. And i'm sure you know, MAF data doesn't have an effect on cold start, being that it is in open loop.

[slows10]

Try adding fuel to B3201. Yours is all zero. Does the fuel pump prime when you turn the key on before you crank it?

[warlock007]

my cam is 224/224 .567/.567 116 lsa and it needs an idle of 825 which then fluxes 800-850.

Just because the car warm can idle down there doesn't mean its good or healthy for the car, I understand you want the rumble etc of the cam sound but having a stable idle is more important and healthier for the car.

Put the idle like this:

-40 1000 1000 1150 1150
-28 1000 1000 1150 1150
-16 1000 1000 1000 1000
-4 975 975 1050 1050
8 925 925 1050 1050
20 900 900 975 975
32 875 875 975 975
44 800 800 900 900
56 800 800 850 850
68 800 800 825 825


80-140 are the same as 68degrees C

you can put them to 800 but i would recommend 825 for your cam

I found my VE for idle 800 15(map) 1.0950 seems to make it pretty stable over all and i never have an issue with idle at any temp.

[sac811]

I dont have any issue with idle 2 seconds after I start it even when cold. I just have to give it a little gas then let it come down and it idles fine cold.

I just want it to start right up withoit giving it gas on startup.

Yes the fuel pimp primes every time on turning key to on position.

But ill give these thjngs a shot.

Thanks

[sac811]

Try adding fuel to B3201. Yours is all zero. Does the fuel pump prime when you turn the key on before you crank it?

From all that I see, no stock files or modded files use anything other than 0 on table b3201

Do you have any suggestions on what sort of data I should enter in this table?

The pump does prime and has always primed and never had a problem starting and staying running right after until motor/cam swap. But figured that was normal.