As promised, here are a few pictures of the process of putting the wiring harness back in place. When I first made the decision to pull the harness I was a bit intimidated by all of the sensor connections and the length of the harness all the way back to the O2 sensors. After having pulled it and now put it back in place, it is not such a mystery anymore and I’m glad I did it this way. I’ll try to discuss pros and cons in a later post but for now lets get on with the show…
The harness seems like a big tangled mess of branches and connectors:
However, when you spread it out there are just three major branches. The first is easy. It is the electrical connections for the injectors and throttle body. You don’t have to thread this branch through the intake manifold. Just hook it up. The other two branches split just below the intake manifold. One branch goes to the rear for the tranny connections and the other branch serves all of the various sensors on the drivers side of the block.
It was easiest to thread the long transmission/O2 leg through the manifold first. Then drag the last four sensor connections that hook up to the head.
The harness is fed between the #4 and #5 intake runners. The fuel line to the fuel rail shares the same space and makes this a tight fit. Removing this line might have made this process a snap, but I didn’t do it. If you have removed the fuel rail to service the injectors, leaving this fuel line off until after the harness is in place may be helpful. Even so, it was pretty easy to thread everything through.
Once the harness was through the intake, I started at the front and began hooking up the connections. Starting with the four connections at the head…
There are two tabs that secure the harness to the block. This is the front one…
You may notice from the last two pictures that I painted the block.
When I had everything stripped off I went ahead and hit it with a coat of high temp black rattle can. This should make it easier to spot any leaks once I fire it up.