I am trying to reinstall an 4.3 lit vortec and there is a wire that i dont find where to connect It is in the big harness from side to side and it is two wires in it Black and yellow and the conector is blue in the tip, it comes out of the harness close to the fuelinjection and is long enough to reach distributor or the ac unit. where should it be conected. Sorry for my bad spelling but im Swedish spoken so this is not so easy.
Can i find help here??
Thanks in advance.
Cosmo

 

I found the solution it was conected at left side exhaustmanifold.
Close to 3 cylinder sparkplug.

 

Could very well be the ECT, (engine coolant temp sensor). Located on the left cylinder head between cylinders 3 & 5. If that's not it, a picture would be very helpful.

 

Thanks Captain
You are right and i started it up after renovaiting the engine and it just fired up in maybe half a rotating of machine and goes fantastic. Idraw it warm and chainged oil and filter again. But it has been a lot of work to do, just to get the motor out is a big job in this car, at least for me. Lets call it a hobby.
Hans (Cosmo)

 

Hans, Big job, glad you have her running again. Thanks for posting back.