1968 C10 5.3L LMG no start?????

[ChipsByAl]

The service number is located on the backside of the ECM and is the part number.
Al

[VEGASROBBI]

Not sure what the "service #" is, but the OS is 12614088

You should have a label on your ECM with the service #. I'm also running OS 12614088 from a 2007 Tahoe 5.3, here's my tune.

[gmh308]

Not sure what the "service #" is, but the OS is 12614088

On the back of the ECM there is a white sticker with bar code and numbers. What are the 8 digit numbers on it?

[GAMEOVER]

Did tk-mpl ever get it started?

[tk-mpl]

No, just got back from work and I got a virus on my laptop... I was going to try the tune posted by VEGASROBBI and see if that works... I have exhausted everything else...

[GAMEOVER]

Man that sucks....I was just curious because I'm about to embark on another 2007 5.3ltr motor swap-conversion

[tk-mpl]

Is it a old bodystyle truck or new bodystyle (donor truck).

[GAMEOVER]

New body style, I did a swap of the same type motor(58 tooth reluctor) into a Jeep Wrangler and i could never get it started. Owner was pretty upset with me but we ended up removing motor and installing 6.0 from 05' Denali...
But I never tried the power relay or starter enable relay tricks. On this motor I'm gonna try a corvette manual tune before I try anything else though.

[tk-mpl]

I even tried both starter relay circuit and powertrain relay tricks and nothing

[tk-mpl]

Well I loaded that other tune and it fired right up... Scare the sh@t out of me (open headers)... Now I want to know what the difference is between the two.. Is this other engine DOD, and if not how do I change my tune to work...

Thanx alot guys........... Still have ?'s, but am very happy..