I am having trouble routing this connector under the distributor on my 93 Del Sol si with a d16z6. Any know where to route this?

 

It suppose to route to the O2 sensor on the stock exhaust manifold.

 

Your photo shows a ceramic coated aftermarket header bolted to your engine... it is likely that the O2 sensor is now connected to the header at the back near the collector (and not at the front as tech8 has pictured), which is under the intake manifold near the rear cross member. You would either have to open up the engine harness exposing all of the wiring and route the plug you have pictured back under the intake manifold along the main engine harness bundle so that your original O2 sensor wiring can plug into it... then re-loom and tape it all back up, or purchase/make an O2 wiring extension that connects your two current plugs. If you want to buy one, PM me for a source... they have a few different lengths available and in stock.