Cos3 (2bar)

[aaronr]

When I went from stock os to the Cos3 2bar tune.
When I reflash my truck it will run for sec than die. I had to do this two or three times before it run on it's own. Do need to do a crank re-lean after you do this or this common thing.

[hquick]

Not saying I'll know how to help....but it always helps to post your tune so others can see if there's any obvious issues.

[ringram]

Might just be your idle learning. Which might suggest that your base map might need some work :)
If its ok now Id say thats what the problem was. Look into the RAF and Idle transition tuning notes.

[aaronr]

It does this ever time i reflash for an update.

[Chevy366]

Every time it should stumble (MAF fails goes into SD) a little but should not fail to start and stay running .
Post up your .tun .

[hquick]

Are you running OLSD (mafless) with the Cos3 tune?

[aaronr]

Are you running OLSD (mafless) with the Cos3 tune?

Yes

[joecar]

Did you follow the COS tutorial...?

Did you do full flash of COS followed by cal flash of your old tune...?

Is your COS file compatible with your old tune as listed on the COS tutorial page 4...?