My car is lean in the morning

[joecar]

Thanks for the clarification. Sorry I stepped on your response..

No problem, feel free to post what/when you like, this is all in the spirit of open discussion...

[joecar]

1250001 doesn't have A0014 and a few other tables.

Yes, IAT is going pretty high...

wesam, do you have a pic of your engine bay, and where are you located (generally)...?

[wesam]

I Don't have a heat soak problem i'm living in Middle east ( Qatar ) the temperature here is 40* C in the evening
so its normal to see such IAT
So how could i install a COS3 ? from where could i get it for my car 2004 Lumina SS ( GTO )

[stigmundfreud]

After going COS3 I returned to standard OS as whilst the temp blending can make things easier I found it more accurate to run stock OS and just autoVE at a regular constant IAT/AT also to keep things steady made sure the baro was always in a similar range. Thats not to say ignore COS3 but the message, as stated, is to tune in as regular situations as possible. If it isnt that easy then filter your logs based on a close IAT range, the ECU can then adjust based on a VE created on a mean IAT

[joecar]

01250003/COS3 should be present in your EFILive install... look under the LS1B Custom OS folder.

Full flash the 01250003 file into the PCM, then cal-only flash from your current 01250001 file, then fix any out-of-range cells... then read the PCM and save to file... make sure car runs the same as previous before making any edits.

[wesam]

will 01250003/COS3 work with all ls1 engines camaro,GTO,C5 ?
or is it specific for the GTO ?

[joecar]

According to the COS Upgrade Tutorial, the 0125000x OS's are based on either of 12202088 or 92111922.

What was your stock GM OS...?