How difficult is installing a wire harness? Will I need to pay a mechanic to install it?
This job has a higher degree of difficulty than most home-mechanic tasks, however it can be done in an afternoon with ordinary automotive tools. It is more difficult on some models than others. On early 4 cylinder 240’s (up to ’82, and all Turbos), I usually remove the intake manifold to better access the connections underneath. These mechanically injected 240’s (non-turbos) and the 240 Turbos seem to be the most difficult as far as reaching connections and those intake manifolds are always in the way. But all of them get easier with the intake manifold at least partially pulled away from the engine. On the other hand, most later 240’s (1983 and later non-turbos) and 700 series cars will have much more room to reach under the intake manifold and I generally do not remove the manifold when changing a 4-cylinder harness on those cars.
