Ok heres my problem I had to remove my distributor because of a bad oil sending unit sensor.
Near where the distributor plug is a single blue wire with a plug in on it.Its at the back of the firewall.
Where does it go?

 

Hey!!! i think there is a plug that plugs into the oil pressure sending unit maybey thats it, or its the knock sensor?

 

Heres a pic of the wire
Ive also looked everywhere for any kind of sensor within reach of this wire to no avail.Theres nothing I can find.Also since these engines are timed by placement of the distributor I dont beleive there is a knock sensor.

 

dont know then, mine is a 2000 4.3 blazer and even tho its timed by place ment of the distributer, mine still has a knock sensor. good luck man, oh wait, that might go to the hood light !!

 

Knock sensor on 96 is located on the top rear of the engine, near the oil pressure sending unit. It uses a single dark blue wire.