E40 Cam Cold Start issue........help please!!

[quik95lt1]

Kinda new to the boards here and i appreciate the help ive recieved so far from everybody........i recently put a 224/236 113LSA cam in my LS2 GTO and have one issue left lingering...........i got the part throttle, idle, WOT perfect.....car runs great............also warm starts are perfect as well as even slightly warm starts >80ECT or so.............but if i let the car sit ovenight and its cold out <50* or so the car will struggle to fire on the first shot.............it cranks and cranks and never tries to fire......seems like there is no fuel.........just cranks and cranks........if i let it sit for like 20 sec then try it it will sometimes start......eventually i got it to start up and soon as it fired it came right up to 1200 and idled fine on its own and drove perfect...no smoke or smell either after it fired it showed no signs of being loaded up.......just seems to be that inital ice cold start up..........any help would be appreciated.......

thanks
Mike

[gmperformancecentre]

post up your tune

[quik95lt1]

12175here ya go........thanks!!!

[gmperformancecentre]

give this a try when the engine is cold and see if that helps

[quik95lt1]

give this a try when the engine is cold and see if that helps

Thanks a ton!!! Ill try it out in the morning......can I ask what u changed just trying to learn

[Ira]

Open both tunes and look at the differences. It's a built in feature of the 7.5 tune tool.

Ira

[gmperformancecentre]

open the file in v7.5 and click on history and have a look at the last mods on the bottom of the page

[gmperformancecentre]

how did it go

[quik95lt1]

tried it it actually got worse lol...........i kept screwing with it and i got it figured out ..........the cranking commanded fuel table reacts very odd to changes........i got it dialed in now..............now im trying to figure out the dynamics compensation tables..........thinking the small jumps/jerks i feel in the very light throttle have to do with this................can you shed any light on this?

[VEV8]

check your inbox.. Cheers Ryan

[quik95lt1]

thanks ryan!!! i dont see anything in my inbox though lol??

[VEV8]

PM me your email address as you dont have an option for PM

[quik95lt1]

got it fixed.....went in SD mode and Auto Tuned VE table.......was 15% rich at idle and low load rpm areas of the table.........car runs perfect now...thanks for the help!!!