'94 k3500 chevy O2 sensor

Discussion in 'Trucks and Trailers' started by Markf, Nov 26, 2004.

  1. Markf

    Markf LawnSite Senior Member
    Posts: 407

    Gentlemen,
    I have a 1994, K3500 Chevy rack dump with a 350, auto, 4x4. The problem is that when I bought the truck used, I did not notice the O2 wire from the sensor had been cut. I have a new OEM O2 sensor, but I am unable to find the wire that it connects to. I also cannot find the place where the other half of the O2 wire plugs into the engine/computer/throttle body or what have you.
    Does anyone know where it plugs into or can direct me to a wiring diagram?
    Thanks. I believe that once the problem is rectified, I will get more than 6 MPG.
    Mark
     
  2. Eric 1

    Eric 1 LawnSite Bronze Member
    Posts: 1,220

    I have the same engine, i will look tomorrow and report back.
     
  3. Eric 1

    Eric 1 LawnSite Bronze Member
    Posts: 1,220

    Ok. On mine it is a single purple wire on the right side of the truck (looking from the front) It goes into the main harness. Here is a pic. Sorry it so dark, the flash on the camera did not work. the red line points to the wire. Hope that helps.

    02.JPG
     
  4. Markf

    Markf LawnSite Senior Member
    Posts: 407

    Thanks, Eric1. I can see the wire harness near the steering shaft and the O2 sensor below.
     

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