alright ill make note of that when i go and tackle this problem myself..

 

The code 12 on my LS has finally and truly been solved. There's the wire harness that feeds all the the sensors, crank and the two cams. In 2006 when I installed a import engine and trans, this new engine(from japan) was a little different.This harness in question didnt have these two wires that pluged into the left ignition coil. I'm not talking about the tension wire either. There's a pair of wires that plugs into the left coil in addition to the tension wire. I had to cut this missing pair of wires off the old engine and reattach them to my new japanese version engine. I thought I had done a good job cause obviously the car started and ran well at least initially. I guess over time this connection weakened because these wires are related to the ignition system. Python you are the man and because of your suggestion about the sensor connectors, I revisited theses wires and soldered them instead of the way i had originally re-attached them.
This was the CULPRIT PERIOD!!!!!!!
The japanese version of this engine is slighty different and i had to switch some parts like throttle body and do other mods like drill and tap a hole for this valve that i guess idles the engine down once the coolant warms up. the wire was the other mod. Licelsior, i hope this also helps you and anyone else out there. Thanks again everyone

 

Will try and post Pic's later to illustrate.

 

The code 12 on my LS has finally and truly been solved. There's the wire harness that feeds all the the sensors, crank and the two cams. In 2006 when I installed a import engine and trans, this new engine(from japan) was a little different.This harness in question didnt have these two wires that pluged into the left ignition coil. I'm not talking about the tension wire either. There's a pair of wires that plugs into the left coil in addition to the tension wire. I had to cut this missing pair of wires off the old engine and reattach them to my new japanese version engine. I thought I had done a good job cause obviously the car started and ran well at least initially. I guess over time this connection weakened because these wires are related to the ignition system. Python you are the man and because of your suggestion about the sensor connectors, I revisited theses wires and soldered them instead of the way i had originally re-attached them.
This was the CULPRIT PERIOD!!!!!!!
The japanese version of this engine is slighty different and i had to switch some parts like throttle body and do other mods like drill and tap a hole for this valve that i guess idles the engine down once the coolant warms up. the wire was the other mod. Licelsior, i hope this also helps you and anyone else out there. Thanks again everyone.

PS:I will try try and post Pic's later to illustrate

 

im gonna check the CSS first then im gonna clean the connecter and hope for the best.

 

Check the wiring shape too - if the harness isn't clipped back onto the timing covers, the serpentine belt will slice it like a knife.