Gto Os 12587874

[ntae]

Hi I have a customer with a LS1 engine /harness /PCM out of a dec 04 left hand drive GTO

the OS is 12587874 the BCC is YFYJ the car went to the US when new but there must of been some slight mishap as the engine & auto has made its way back home to OZ and is getting fitted in to a Hotrod

I dont have the pcm here so i asked for the OS number off the sticker so i know what i was playing with and found my first problem i dont think EFILive supports that OS as i can not find any info :eek: . i looked in to it more and i think its a 1meg PCM because of the colours on the plugs but its not fly by wire ,its cable

does any one have a wiring diagram for a dec 04 US GTO i could get a copy of or some info on that OS & my cable / fly by wire problem with a 1 meg PCM

Geoff

[GMPX]

You are right, never seen that OS.
Treat the 1Mb PCM pinouts the same as the 512K without ETC.

Cheers,
Ross

[gto_in_nc]

Curious. My December '04 build-date GTO is BCC YFYJ but OS is 12587604.

[ntae]

Curious. My December '04 build-date GTO is BCC YFYJ but OS is 12587604.

Is yours cable or fly by wire ? & what size PCM

Thanks for your help

[gto_in_nc]

The '04 GTO had an LS1 which was cabled throttle (the '05 and '06 had ETC LS2s.) It is a 1 Meg PCM.

[1meangto]

Curious. My December '04 build-date GTO is BCC YFYJ but OS is 12587604.
My o4 gto is this same os I have never seen the os you are asking for either. My car is a october build car which I would think has the first os. I guess I would use the 12587604 and flash it in the computer My tune is here for a a4 car. http://holdencrazy.com/EFILive/TuneFileRepository/Stock/Pontiac/2004%20Pontiac%20GTO%20Coupe%20Automatic%20LS1%205 .7%20Litre%20(PCM%2012587604).tun

[mistermike]

Curious. My December '04 build-date GTO is BCC YFYJ but OS is 12587604.
Mine is an Oct 04 build with the same OS. I've never seen the OS number mentioned by the poster.