Engine swap...which wire harness?

Swapping engines 05 sequoia into my 06 tundra. same engine same trans. question is do i keep the wire harness attached to the new engine or keep the harness attached to the tundra?

 

leave the harnesses alone while you pull your engine with its harness, and install the new engine with its harness... it'll be easier to just plug the new engine with its harness to the ECU than resetting your harness on the new engine... If it doesn't work, then you can always pull the old harness out and swap it over.

 

Plugged harness in that was in engine went to start and no response. plugs are all the same its just different amount of wires to each plug are differnet. so i should use wire harness from tundra right?

 

Have you verified if the wires are correctly plugged in? Battery is good with good engine grounds?

 

You may need a couple tries, as long as there are not apparent mechanical issues with the engine, just to get it back up and running again...

 

all plugs and ground are good battery good i own both engines sequoia was totalled strong motor and half the miles of my truck. after everything was swaped the only noise heard when turning key was a click at the oil pressure sensor. the starter wont engage no fuel pump pumping relays are all good

 

try swapping the ECU over... I'm sure the ECU is separate from the body harness as they have different functions... Ensure the ECU is properly grounded...

 

still nothing

 

At this point, you may as well swap your old harness over, if you haven't already... Take pictures of how the loom wired through, if you have to remove the intake manifold, you might as well bring your old starter with it...

 

how long has the sequoia engine been sitting??

 

A year but put marvel oil down all cylinders and turned the crank after changing water pump and timing belt.

 

Were you able to get to run??
I got locked out of my computer last night due to an update, which took the better part of 4 hours, lol....

 

What a pain in the rear! would have been so much easier while it was out. getting ready to put the wire harness and intake back in now. fingers crossed

 

Did it work??